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Automatic Transmission - 6l45 (Mya) - Diagnostic Information and Procedures Cadillac ATS I

Automatic Trans 9 illustrations ~40295 words

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
SignalP057CP057CP057DP057B
5 V ReferenceP057C P0651P057CP0651
Low ReferenceP057DP057D

Typical Scan Tool Data

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Ignition ON. Normal Range: 0.25-4.75 V
5 V Reference0 V0 V
Signal0 V0 V5 V
Low Reference5 V

Brake Pedal Position Sensor

Circuit/System Description

The brake pedal position (BPP) sensor is part of the engine brake pedal override feature. The engine control module (ECM) continuously monitors the vehicle speed and the position of the brake pedal. These two main inputs, along with other ECM inputs are used to determine if the vehicle is decelerating at the proper speed and rate with the brake pedal applied. When the engine brake pedal override system is active, the ECM reduces engine torque to assist in reducing vehicle speed.

The BPP sensor is a six wire sensor, and is part of a dual brake position sensor. One BPP Sensor is used for the stop lamps and the other BPP Sensor is used for the engine brake pedal override feature. The BPP Sensor for engine brake pedal override communicates with the ECM. The ECM supplies a 5 V reference circuit, low reference circuit, and signal circuit to the BPP sensor. The BPP sensor sends a voltage signal to the ECM on the signal circuit. The voltage on the signal circuit will vary from a voltage greater than 0.25 V when the brake pedal is released to a voltage less than 4.75 V when the brake pedal is fully applied.

For information on the Stop Lamps side of the BPP Sensor, refer to Exterior Lighting Systems Description and Operation .

Conditions for Running the DTC

  1. Ignition voltage is greater than 10 V.
  2. DTC runs continuously when above condition is met.

Conditions for Setting the DTC

P057B

ECM detects the BPP sensor signal is stuck in a range.

P057C

ECM detects the BPP sensor voltage is less than 0.25 V for 1 s.

P057D

ECM detects the BPP sensor voltage is greater than 4.75 V for 1 s.

Action Taken When the DTC Sets

  1. P057B, P057C, and P057D are Type A DTCs.
  2. Engine torque is reduced to 50% of available engine torque during brake torque management.
  3. Brake torque management is active at 25 kPa (3.7 PSI) of brake apply pressure.

Conditions for Clearing the DTC

P057B, P057C, and P057D are Type A DTCs

Reference Information

Schematic Reference

  1. «Exterior Lights Schematics»(/cadillac/ats/i-2012-2014/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Note. The Brake Pedal Position sensor scan tool data is located in the ECM automatic transmission data list.

  1. Ignition ON.
  2. Verify DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If none of the DTCs are set
  3. Transmission in Park, and service brake pedal released.
  4. Verify the scan tool Brake Pedal Position Sensor parameter in the ECM displays greater than 0.25 V. If 0.25 V or less Refer to Circuit/System Testing. If greater than 0.25 V
  5. Verify the scan tool Brake Pedal Position Sensor parameter voltage changes as the brake pedal is applied and displays less than 4.75 V when the brake pedal is fully applied. If the voltage does not change, or is greater than 4.74 V Refer to Circuit/System Testing. If the voltage changes and less than 4.75 V
  6. Verify the scan tool Brake Pedal Position Sensor Learned Release Position parameter is within 0.1 V of the Brake Pedal Position Sensor parameter when the brake pedal is fully released. If difference is greater than 0.1 V Perform the «Brake Pedal Position Sensor Learn»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__brake-pedal-position-sensor-learn) . If difference is 0.1 V or less
  7. Verify the Brake Pedal Position Sensor parameter transitions smoothly without any spikes or dropouts when slowly applying and releasing the brake pedal. If parameter does not transition smoothly or has spikes or dropouts Refer to Circuit/System Testing. If parameter transitions smoothly and there are no spikes or dropouts
  8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  9. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  10. All OK.

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B22 Brake Pedal Position Sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the low reference circuit terminal 6 and ground. If 10 ohms or greater Disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 10 ohms
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 5 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance. Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  5. Verify the scan tool Brake Pedal Position Sensor parameter is less than 0.25 V. If 0.25 V or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 0.25 V between the signal circuit terminal 4 and ground. If 0.25 V or greater, repair the short to voltage on the circuit. If less than 0.25 V, replace the K20 Engine Control Module. If less than 0.25 V
  6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 5.
  7. Verify the scan tool Brake Pedal Position Sensor parameter is greater than 4.8 V. If 4.8 V or less Ignition OFF, remove the jumper wire, and disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit terminal 4 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 4.8 V
  8. Replace the B22 Brake Pedal Position Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Brake Pedal Position Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/exterior-lights/#lighting-system-repair-instructions__brake-pedal-position-sensor-replacement)
  2. Perform the «Brake Pedal Position Sensor Learn»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__brake-pedal-position-sensor-learn) following the replacement of the ECM or BPP sensor, or any repair that effects the BPP sensor alignment.
  3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

This is an internal fault detection of the control solenoid valve assembly. This fault is carried out inside the Transmission Control Module and no external circuits are involved.

DTC P0601, P0603, P0604, or P062F is not set.

P0601

  1. The read only memory has detected an incorrect program or calibration checksum error.
  2. This condition has been present 5 or more times within a 16 count time period.

P0603

  1. The TCM has detected a long term memory checksum error during power up.
  2. This DTC runs continuously.

P0604

  1. The TCM has detected a single word failure with the random access memory.
  2. This condition has been present 5 or more times within a 16 count time frame.

P062F

  1. The TCM has detected the non-volatile memory is incorrect during power-down.
  2. This DTC runs continuously.

P0601, P0603, P0604, and P062F

  1. The high side driver is turned Off.
  2. The TCC is turned Off.
  3. The TCM request maximum line pressure.
  4. The ECM reduces engine torque based on transmission input speed.
  5. Neutral idle is inhibited.
  6. Tap Up/Down is inhibited.
  7. Tow/Haul mode is inhibited.

DTCs P0601, P0603, P0604, and P062F are Type A DTCs.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Ignition OFF for one minute. Ignition ON.
  2. Verify with a scan tool that DTC P0601, P0603, P0604, or P062F is not set. If any of the DTCs set Replace the Q8 Control Solenoid Valve Assembly. If none of the DTCs set
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set. If the DTC sets Replace the Q8 Control Solenoid Valve Assembly If the DTC does not set
  5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The transmission control module temperature sensor is located inside of the control solenoid valve assembly which has no serviceable parts. The Transmission Control Module monitors the Transmission Control Module sensor for over temperature protection.

  1. Ignition voltage is between 8.6-32 V.
  2. The TCM internal temperature is between 0-170°C (32-338°F) for 0.25 s.

Condition 1

The internal temperature of the TCM is greater than 142°C (288°F) for 5 s.

Condition 2

  1. Ignition voltage is 18 V or greater for 2 s.
  2. The internal temperature of the TCM is greater than 50°C (122°F) for 2 s.
  1. DTC P0634 is a Type A DTC.
  2. TCM disables TAP Up/Down shift operation.
  3. TCM enables torque management.
  4. TCM limits the transmission to Reverse and 4th or 5th gear operation.
  5. TCM inhibits manual shifting of forward gears.
  6. TCM commands maximum line pressure.
  7. TCM turns Off.

DTC P0634 is a Type A DTC.

Diagnostic Aids

During a road test, the TCM temperature should steadily increase to a normal operating temperature, then stabilize.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Verify the transmission fluid level and condition is correct. Refer to «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) . If the transmission fluid level and condition is not correct Repair as necessary. If the transmission fluid level and condition is correct
  2. Operate the vehicle until normal engine temperature is reached.
  3. Verify with a scan tool the ECT Sensor parameter is less than 125°C (257°F). If greater than 125°C (257°F) Refer to «Symptoms - Engine Cooling»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) . If less than 125°C (257°F)
  4. Verify the scan tool Transmission Control Module Temperature is less than 142°C (287°F). If greater than 142°C (287°F) Inspect the transmission fluid lines for being misrouted, kinked, or damage. Repair or replace as necessary. If the transmission fluid lines are OK, replace the Q8 Control Solenoid Valve Assembly. If less than 142°C (287°F)
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Replace the Q8 Control Solenoid Valve Assembly. If the DTC does not set
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Control Solenoid Valve Assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Transmission Control Module high side driver 1 is located inside of the control solenoid valve assembly which has no serviceable parts. The high side driver 1 provides power to the Transmission Control Module pressure control solenoids and shift solenoids. This fault is handled inside the Transmission Control Module and no external circuits are involved.

P0658

  1. Ignition voltage is between 8.6-32 V.
  2. High side driver 1 is On.
  3. DTC P0658 is not set.

P0659

  1. DTC P0659 is not set.
  2. Ignition switch transitions from OFF to ON position.

P0658

The Transmission Control Module detects an internal open or short to ground on the high side driver 1 for 1 s.

P0659

The Transmission Control Module detects an internal short to voltage on the high side driver 1 circuit for 1 s after engine start.

P0658

  1. DTC P0658 is a Type A DTC.
  2. The TCM turns OFF high side driver.
  3. The TCM turns OFF all solenoids.
  4. The TCM commands maximum line pressure.
  5. The TCM freezes transmission adaptive functions.
  6. The TCM commands the TCC OFF.
  7. The TCM inhibits the TAP Up/Down function.
  8. The TCM inhibits manual shifting of forward gears.
  9. The TCM limits the transmission to Reverse and 5th gear.

P0659

DTC P0659 is a Type C DTC.

  1. DTC P0658 is a Type A DTC.
  2. DTC P0659 is a Type C DTC.

When DTC P0658 sets, the line pressure control solenoid, and pressure control solenoids 2 and 3, will default to maximum pressure. This results in maximum line pressure to the 3-5 reverse clutch, low/reverse clutch and the 4-5-6 clutch assemblies.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  2. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  3. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Ignition ON.
  2. Verify the scan tool High Side Driver 1 parameter displays ON. If ON is not displayed Refer to Circuit/System Testing. If ON is displayed
  3. Engine Running and the gear selector lever is in the park position.
  4. Verify the scan tool parameters listed below do not display Malfunction. High Side Driver 1 Circuit High Voltage Test Status High Side Driver 1 Circuit Open Test Status High Side Driver 1 Circuit Low Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  2. Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If contaminated Repair as necessary. If not contaminated
  3. Verify the resistance is within the specified range for each solenoid. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If resistance is not within range Replace the Q8 Control Solenoid Valve Assembly. If resistance is within range
  4. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  5. Connect DT-47825-10 jumper harness between the vehicle wire harness electrical connector, and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  6. Verify the scan tool parameters do not display Malfunction. High Side Driver 1 Circuit High Voltage Test Status High Side Driver 1 Circuit Open Test Status High Side Driver 1 Circuit Low Voltage Test Status If Malfunction is displayed Replace the Q8 Control Solenoid Valve Assembly. If Malfunction is not displayed
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Transmission Control Module temperature sensor is located inside of the control solenoid valve assembly which has no serviceable parts. The Transmission Control Module temperature sensor provides the temperature of the Transmission Control Module substrate. This temperature reading is used in various diagnostic routines in the Transmission Control Module software. This fault is handled inside the Transmission Control Module and no external circuits are involved.

DTC P0667

  1. DTC: P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0658, P0668, P0669, P06AD, P06AE, P0716, P0712, P0713, P0717, P0722, P0723, P0962, P0963, P0966, P0967, P0970, P0971, P215C, P2720, P2721, P2729, or P2730 is not set.
  2. Engine speed is 400-7,500 RPM or greater for 5 s.
  3. Ignition voltage is between 8.6-32 V.
  4. Brake torque is not active.
  5. Engine torque signal is valid.
  6. Throttle position signal is valid.

DTC P0668

  1. Engine speed is 400-7,500 RPM or greater for 5 s.
  2. Ignition voltage is between 8.6-32 V.

DTC P0669

  1. DTC P0716, P0717, P0722 or P0723 is not set.
  2. Engine speed is 400-7,500 RPM or greater for 5 s.
  3. Ignition voltage is between 8.6-32 V.

P0667

  1. The TCM detects a 20-50°C (36-90°F) or greater difference between the transmission fluid temperature and the TCM substrate temperature, which depends on the average of the transmission fluid temperature, TCM substrate temperature, and the TCM power up temperature.
  2. The TCM detects a 8-10°C (14-18°F) or greater difference between the TCM power up temperature and the TCM substrate temperature, which depends on the average of the transmission fluid temperature, the TCM substrate temperature, and the TCM power up temperature.
  3. The above conditions have to be met for 5 min.

P0668

The TCM internal temperature is -249°C (-416°F) or less for 1 min.

P0669

The TCM internal temperature is 249°C (480°F) or greater for 1 min.

  1. DTCs P0667, P0668, and P0669 are Type B DTCs.
  2. The TCM defaults to a calculated value for the substrate temperature based on the TCM power up temperature.

DTCs P0667, P0668, and P0669 are Type B DTCs.

During a road test, the TCM temperature should steadily increase to a normal operating temperature, and then stabilize.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  3. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Engine idling at normal operating temperature.
  2. Verify the scan tool Transmission Control Module Temperature parameter is between -247 and +247°C (-412 and +477°F). If not between -247 and +247°C (-412 and +477°F) Replace the Q8 Control Solenoid Valve Assembly. If between -247 and +247°C (-412 and +477°F)
  3. Verify the scan tool Transmission Control Module temperature parameter increases greater than 2°C (3.5°F) after operating the vehicle at 64 km/h (40 mph) for 10 minutes. If the temperature does not increase greater than 2°C (3.5°F) Replace the Q8 Control Solenoid Valve Assembly. If the temperature does increase greater than 2°C (3.5°F)
  4. Verify the scan tool Transmission Control Module Temperature and the Transmission Fluid Temperature parameters are within 10°C (18°F) of each other. If the temperature is not within 10°C (18°F) Replace the Q8 Control Solenoid Valve Assembly. If the temperature is within 10°C (18°F)
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Replace the Q8 Control Solenoid Valve Assembly. If the DTC does not set
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Transmission Control Module power up temperature sensor is located inside of the control solenoid valve assembly which has no serviceable parts. The Transmission Control Module power up temperature sensor provides the temperature of the Transmission Control Module when the Transmission Control Module power is on. This temperature reading is used in various shifting and diagnostic routines and also to protect the control solenoid valve assembly and Transmission Control Module. This fault is handled inside the Transmission Control Module and no external circuits are involved.

P06AC

  1. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0658, P0668, P0669, P06AD, P06AE, P0716, P0712, P0713, P0717, P0722, P0723, P0962, P0963, P0966, P0967, P0970, P0971, P215C, P2720, P2721, P2729, or P2730 is not set.
  2. Engine speed is between 400-7,500 RPM for 5 s.
  3. Ignition voltage is between 8.6-32 V.
  4. Brake torque is not active.
  5. Engine speed is valid.
  6. Throttle position is valid.
  7. Transmission input speed sensor signal is 200 RPM or less.
  8. Engine throttle position signal is 30 percent or greater.
  9. Vehicle speed is 8 km/h (5 mph) or less.

P06AD

  1. DTC P06AD, P0716, P0717, P0722 or P0723 is not set.
  2. Engine speed is between 400-7,500 RPM for 5 s.
  3. Ignition voltage is between 8.6-32 V.

P06AE

  1. DTC P06AE is not set.
  2. Engine speed is 400 RPM or greater for 5 s.
  3. Ignition voltage is between 8.6-32 V.

P06AC

  1. The TCM detects a 8-10°C (14-18°F) or greater difference between the TCM substrate temperature and TCM power up temperature, which depends on the average of transmission fluid temperature, TCM substrate temperature, and TCM power up temperature.
  2. The TCM detects a 20-50°C (36-90°F) or greater difference between the transmission fluid temperature and TCM power up temperature, which depends on the average of transmission fluid temperature, TCM substrate temperature, and TCM power up temperature.
  3. The above conditions have to be met for 5 min within a 6 min period.

P06AD

The TCM power up temperature is -59°C (-74°F) or less for 1 min.

P06AE

The TCM power up temperature is 164°C (327°F) or greater for 1 min.

  1. DTCs P06AC, P06AD, and P06AE are Type B DTCs.
  2. The TCM defaults the TCM power up temperature to the TCM substrate temperature with an offset value.

DTCs P06AC, P06AD, and P06AE are Type B DTCs.

During a road test, the TCM Power-Up temperature should steadily increase to a normal operating temperature, and then stabilize.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Ignition ON, clear the DTCs with a scan tool.
  2. Operate the vehicle at 64 km/h (40 mph) for 10 min.
  3. Verify DTC P06AC, P06AD or P06AE is not set. If any of the DTCs set Replace the Q8 Control Solenoid Valve Assembly. If none of the DTCs set
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  5. Verify the DTC does not set. If the DTC sets Replace the Q8 Control Solenoid Valve Assembly. If the DTC does not set
  6. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The transmission fluid temperature sensor is located inside of the Transmission Control Module assembly which has no serviceable parts. The transmission fluid temperature sensor provides transmission fluid temperature information to the Transmission Control Module. This fault is handled inside the Transmission Control Module and no external circuits are involved.

P0711

  1. DTCs: P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0658, P0668, P0669, P06AD, P06AE, P0716, P0712, P0713, P0717, P0722, P0723, P0962, P0963, P0966, P0967, P0970, P0971, P215C, P2720, P2721, P2729, or P2730 is not set.
  2. Ignition voltage is between 8.6-32 V.
  3. The engine speed is 400-7,500 RPM or greater for 5 s.
  4. The vehicle speed is 8 km/h (5 mph) or greater for 5 min.
  5. The accelerator pedal position signal is valid.
  6. The engine torque signal is valid.

P0712

  1. DTC P0712, P0716, P0717, P0722, or P0723 is not set.
  2. The engine speed is greater than 400-7,500 RPM for 5 s.
  3. Ignition voltage is between 8.6-32 V.

P0713

  1. DTC P0713, P0716, P0717, P0722, or P0723 is not set.
  2. The engine speed is greater than 400-7,500 RPM for 5 s.
  3. Ignition voltage is between 8.6-32 V.

P0711

  1. The TCM detects a 20-50°C (36-90°F) or greater difference between the transmission fluid temperature and the TCM substrate temperature, which depends on the average of the transmission fluid temperature, the TCM substrate temperature, and the TCM power up temperature.
  2. The TCM detects a 20-50°C (36-90°F) or greater difference between the transmission fluid temperature and the power up temperature, which depends on the average of the transmission fluid temperature, the TCM substrate temperature, and the TCM power up temperature.
  3. The above conditions have to be met for 5 min within a 6 min time period.

P0712

The transmission fluid temperature is -74°C (-101°F) or less for 1 min.

P0713

The transmission fluid temperature is 174°C (345°F) or greater for 1 min.

  1. DTCs P0711, P0712, and P0713 are Type B DTCs.
  2. The TCM freezes transmission adaptive functions.
  3. The TCM allows the vehicle to operate in transmission protection mode.
  4. The TCM defaults to the TCM temperature with an offset.

DTCs P0711, P0712, and P0713 are Type B DTCs.

During a road test, the transmission fluid temperature should steadily increase to a normal operating temperature, and then stabilize.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  3. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825 Control Solenoid Test Plate

For equivalent regional tools, refer to Special Tools .

  1. Engine idling at normal operating temperature.
  2. Verify the scan tool Transmission Fluid Temperature parameter is between -74 and +174°C (-101 and +345°F). If not between -74 and +174°C (-101 and +345°F) Replace the Q8 Control Solenoid Valve Assembly. If between -74 and +174°C (-101 and +345°F)
  3. Verify the scan tool Transmission Fluid Temperature parameter increases greater than 2°C (3.5°F) after operating the vehicle at 64 km/h (40 mph) for 10 minutes. If the temperature does not increase greater than 2°C (3.5°F) Replace the Q8 Control Solenoid Valve Assembly. If the temperature does increase greater than 2°C (3.5°F)
  4. Verify the scan tool Transmission Fluid Temperature and the Transmission Control Module Temperature parameters are within 20°C (68°F) of each other. If the temperatures are not within 20°C (68°F) Replace the Q8 Control Solenoid Valve Assembly. If the temperatures are within 20°C (68°F)
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Replace the Q8 Control Solenoid Valve Assembly. If the DTC does not set
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
8.3-9.3 V ReferenceP0716, P0717P0716, P0717P0716
SignalP0716, P0717P0716, P0717P0716, P0717P0716
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 450-7000 RPM
8.3-9.3 V Reference0 RPM0 RPM
ISS Signal0 RPM0 RPM0 RPM

ISS Signal

CircuitShort to GroundOpen/High ResistanceShort to Voltage
Operating Conditions: Key ON, Engine OFF or Engine running, normal operating temperature Parameter Normal Range: OK
8.3-9.3 V ReferenceOut of RangeOKOut of Range
SignalOKOKOK

ISS/OSS Supply Voltage

The automatic transmission input and output speed sensor (ISS and OSS) assembly each are part of a single harness. The ISS is a hall-effect type sensor. The ISS/OSS mounts to the control valve upper body assembly. The ISS sensor end faces the splines on the 1-2-3-4 and 3-5-R clutch housing outside diameter surface. The sensor receives 8.3-9.3 volts on the ISS/OSS supply voltage circuit from the control solenoid valve assembly. As the 1-2-3-4 and 3-5-R clutch housing rotates, the sensor produces a signal frequency based on the splines on the clutch housing outside diameter surface. This signal is transmitted through the ISS signal circuit to the control solenoid valve assembly. The control solenoid valve assembly uses the ISS signal to determine line pressure, transmission shift patterns, torque converter clutch (TCC) slip speed and gear ratio.

P0716

  1. DTC P0101, P0102, P0103, P0121, P0122, P0123, P0717, P0752, P0753, or P0974 is not set.
  2. The engine speed is 400-7,500 RPM or greater for 5 s.
  3. The engine torque signal is valid.
  4. Engine torque is between 0 (0 lb ft) and 8191.88 (6042.01 lb ft).
  5. Ignition voltage is between 8.6-32 V.
  6. The vehicle speed is greater than 10 km/h (6.21 mph).
  7. The throttle position signal must be valid.

P0717

  1. DTC P0101, P0102, P0103, P0722 or P0723 is not set.
  2. The engine speed is 400-7,500 RPM or greater for 5 s.
  3. Ignition voltage is between 8.6-32 V.
  4. The engine torque signal is valid.
  5. The vehicle speed is greater than 16 km/h (10 mph).
  6. The engine torque is between 50 (37 lb ft) and 8191.88 (6042.01 lb ft).

P0716

The TCM detects the transmission input speed sensor signal dropped greater than 900 RPM for 1 s.

P0717 - Condition 1

The TCM detects the transmission input shaft speed is less than 67 RPM for 5 s.

P0717 - Condition 2

The TCM detects that P0722 set and the transmission input speed is less than 653 RPM for 5 s.

P0716

  1. DTC P0716 is a Type A DTC.
  2. The high side driver is turned Off.
  3. The TCM commands TCC Off.
  4. The ECM reduces engine torque based on transmission input speed.
  5. The TCM inhibits Tap Up/Down.
  6. The TCM inhibits manual shifting of forward gears.
  7. The TCM inhibits Tow/Haul mode.

P0717

  1. DTC P0717 is a Type A DTC.
  2. The TCM inhibits shift adaptive functions.
  3. The TCM commands maximum line pressure.
  4. The ECM reduces engine torque based on transmission input speed.
  5. The TCM inhibits neutral idle.
  6. The TCM inhibits Tap Up/Down function.
  7. The TCM inhibits manual shifting of forward gears.
  8. The TCM inhibits manual shifting of forward gears.
  9. The TCM commands neutral gear if the output speed sensor signal is 1,500 RPM or greater.
  10. The TCM commands second gear if the output speed sensor signal is less than 1,500 RPM.

DTC P0716 and P0717 are Type A DTCs.

Inspect the ISS/OSS, harness, connector, and control solenoid valve assembly for metallic debris and the 1-2-3-4 and 3-5-R clutch housing splines on the outside diameter surface for damage or misalignment. Proper torque of the ISS/OSS mounting bolt is critical to proper speed signal operation.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. DT-47825-10 Jumper Harness
  2. J-38522 Variable Signal Generator

For equivalent regional tools, refer to Special Tools .

  1. Ignition ON.
  2. Verify the scan tool ISS/OSS Supply Voltage parameter displays OK. If OK is not displayed Refer to Circuit/System Testing. If OK is displayed
  3. Engine idling in park position.
  4. Verify the scan tool Transmission ISS parameter varies with engine RPM and does not drop out. If the Transmission ISS does not vary with engine speed or drops out Refer to Circuit/System Testing. If the Transmission ISS does vary with engine speed and does not drop out
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Ignition Off, remove the Q8 Control Solenoid Valve Assembly.
  2. Connect the DT-47825-10 Jumper Harness between the vehicle wire harness electrical connector and the Q8 Control Solenoid Valve Assembly electrical connector.
  3. Disconnect the B14A/B14C Transmission Input and Output Speed Sensor harness connector X3 at the Q8 Control Solenoid Valve Assembly. Ignition ON.
  4. Test for 8.3-9.3 V between the supply circuit terminal B at the Q8 Control Solenoid Valve Assembly. If not between 8.3-9.3 V Replace the Q8 Control Solenoid Valve Assembly. If between 8.3-9.3 V
  5. Ignition Off, connect the red lead of the J-38522 Variable Signal Generator to the signal circuit terminal A at the Q8 Control Solenoid Valve Assembly and ground at the transmission case.
  6. Set the J-38522 Variable Signal Generator to the following specifications: Signal Switch to 5 V Frequency switch to 300 Duty cycle switch to the 50 or the Normal position
  7. Ignition On.
  8. Verify the scan tool Transmission ISS parameter is between 760-785 RPM. If not between 760-785 RPM Replace the Q8 Control Solenoid Valve Assembly. If between 760-785 RPM
  9. Verify there is no damage or misalignment with the machined teeth on the 1-2-3-4 and 3-5 clutch housing. If the machined surfaces are damaged or misaligned Repair or replace as necessary. If the machined surfaces are not damaged or misaligned
  10. Replace the B14A/B14C Transmission Input and Output Speed Sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. Perform the «Input and Output Speed Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup
  4. Perform the «Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) .
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
8.3-9.3 V ReferenceP0722, P0723P0722, P0723P0723
SignalP0722, P0723P0722, P0723P0722, P0723P0723
CircuitShort to GroundOpen/High ResistanceShort to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 0-7000 RPM
8.3-9.3 V Reference0 RPM0 RPM0-7000 RPM
Signal0 RPM0 RPM0 RPM

Output Speed Sensor (OSS) Signal

CircuitOpen/High ResistanceShort to Voltage
Operating Conditions: Key ON, engine OFF or engine running Parameter Normal Range: OK
8.3-9.3 V ReferenceOKOut of Range
SignalOut of Range

ISS/OSS Supply Voltage

The automatic transmission input and output speed sensor (ISS and OSS) assembly each are part of a single harness. The OSS is a hall-effect type sensor. The ISS/OSS mounts to the control valve upper body assembly. The sensor end faces the output shaft housing machined slots. The sensor receives 8.3-9.3 volts on the ISS/OSS supply voltage circuit from the control solenoid valve assembly. As the output shaft rotates, the sensor produces a signal frequency based on the machined slots of the output shaft housing. This signal is transmitted through the OSS signal circuit to the control solenoid valve assembly. The control solenoid valve assembly uses the OSS signal to determine line pressure, transmission shift patterns, torque converter clutch (TCC) slip speed and gear ratio.

P0722

  1. DTC P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, or P0723 is not set.
  2. Ignition voltage is between 8.6-32 V.
  3. The transmission fluid temperature is -40°C (-40°F) or greater.
  4. The engine speed is 400-7,500 RPM or greater for 5 s.
  5. The engine torque signal is valid.
  6. The engine torque is 50 (36.87 lb ft) or greater.
  7. Accelerator pedal position signal is valid.
  8. The throttle position signal is valid.
  9. The throttle position is 8 percent or greater.

P0723

  1. DTC P0101, P0102, P0103, P0121, P0122, P0123, P0973, P0974, P0976, or P0977 is not set.
  2. Ignition voltage is between 8.6-32 V.
  3. The engine speed is 400-7,500 RPM for 5 s.
  4. Greater than 5 s since the last transmission upshift or downshift.
  5. The TCM must receive a valid torque signal from the ECM.
  6. Accelerator pedal position signal is valid.

P0722

The transmission output speed is 35 RPM or less for 4.5 s.

P0723

  1. The transmission output speed is greater than 105 RPM.
  2. The TCM detects the transmission output speed dropped is greater than 650 RPM for 1.5 s.
  3. The transmission is in a forward drive gear.

P0722

  1. DTC P0722 is a Type A DTC.
  2. The TCM turns Off the TCC.
  3. The TCM commands maximum line pressure.
  4. The ECM reduces engine torque based on input speed.
  5. The TCM inhibits Tap up/Down function.
  6. The TCM inhibits manual shifting of all forward gears.
  7. The TCM commands neutral gear if the output speed sensor signal is 1,350 RPM or greater.
  8. The TCM commands 2nd gear if the output speed sensor signal is less than 1,350 RPM.

P0723

  1. DTC P0723 is a Type A DTC.
  2. The high side driver is turned OFF.
  3. The TCM inhibits TCC.
  4. The TCM commands maximum line pressure.
  5. The ECM reduces engine torque based on the signal from the input speed sensor signal.
  6. The TCM inhibits neutral idle.
  7. The TCM inhibits Tap up/Down function.
  8. The TCM inhibits manual shifting.

Conditions for Clearing the DIC/DTC

DTCs P0722 and P0723 are Type A DTCs.

Inspect the ISS/OSS, harness, connector and control solenoid valve assembly for metallic debris and output shaft housing machined slots for damage or misalignment. Proper torque of the ISS/OSS mounting bolt is critical to proper speed sensor operation.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. DT-47825-10 Jumper Harness
  2. J-38522 Variable Signal Generator

For equivalent regional tools, refer to Special Tools .

  1. Ignition ON.
  2. Verify the scan tool ISS/OSS Supply Voltage parameter displays OK. If OK is not displayed Refer to Circuit/System Testing. If OK is displayed
  3. Road test the vehicle.
  4. Verify the scan tool Transmission OSS parameter changes with vehicle speed and does not drop while operating the vehicle within 16-32 km/h (10-20 mph). If the Transmission OSS does not vary with engine speed or drops out Refer to Circuit/System Testing. If the Transmission OSS does vary with engine speed and does not drop out
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Ignition Off, remove the Q8 Control Solenoid Valve Assembly.
  2. Connect the DT-47825-10 Jumper Harness between the vehicle wire harness electrical connector and the Q8 Control Solenoid Valve Assembly electrical connector.
  3. Disconnect the B14A/B14C Transmission Input and Output Speed Sensor harness connector X3 at the Q8 Control Solenoid Valve Assembly. Ignition ON.
  4. Test for 8.3-9.3 V between the supply circuit terminal B at the Q8 Control Solenoid Valve Assembly. If not between 8.3-9.3 V Replace the Q8 Control Solenoid Valve Assembly If between 8.3-9.3 V
  5. Ignition Off, connect the red lead of the J-38522 Variable Signal Generator to the signal circuit terminal C at the Q8 Control Solenoid Valve Assembly and ground at the transmission case.
  6. Set the J-38522 Variable Signal Generator to the following specifications: Signal Switch to 5 V Frequency switch to 300 Duty cycle switch to the 50 or the Normal position
  7. Ignition On.
  8. Verify the scan tool Transmission OSS parameter is between 495-505 RPM. If not between 495-505 RPM Replace the Q8 Control Solenoid Valve Assembly. If between 495-505 RPM
  9. Verify there is no damage or misalignment with the machined slots on the Output Shaft Assembly. If the machined slots are damaged or misaligned Repair or replace as necessary. If the machined slots are not damaged or misaligned
  10. Replace the B14A/B14C Transmission Input and Output Speed Sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. Perform the «Input and Output Speed Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  4. Perform the «Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) .
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

DTC Descriptors

Note. The DTCs listed below set due to a transmission hydraulic/mechanical condition. Perform the Circuit/System Verification and Circuit/System Testing to identify the cause.

The torque converter clutch (TCC) pressure control solenoid is part of the control solenoid valve assembly which has no serviceable parts. The TCC pressure control solenoid is a normally low pressure control solenoid. The TCC pressure control solenoid regulates transmission fluid to the TCC regulator valve in the lower valve body and the TCC control valve in the pump cover. When vehicle operating conditions are appropriate to apply the converter clutch, the Transmission Control Module will increase TCC pressure control current flow (duty cycle) to the TCC solenoid. The TCC pressure control solenoid directs fluid pressure to move the TCC control valve to the apply position, and moves the TCC regulator apply valve to the regulating position. The TCC regulator valve regulates TCC apply fluid pressure proportional to TCC solenoid pressure. When the TCC is fully applied, the engine is coupled directly to the transmission. TCC release is accomplished by the Transmission Control Module decreasing current flow to the TCC pressure control solenoid. This results in decreasing the apply pressure which allows the TCC control valve to move to the release position. The Transmission Control Module calculates torque converter slip speed based on engine speed and transmission input shaft speed.

P0741

  1. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, P0742, P2763, or P2764 is not set.
  2. Ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.
  4. The transmission fluid temperature is -6.6 to +130°C (+20 to +266°F).
  5. The accelerator pedal position signal is valid.
  6. The throttle position is greater than 8 percent.
  7. The TCM must receive a valid torque signal from the ECM.
  8. The engine torque is greater than 50 N.m (36 lb ft).
  9. The TCC is commanded ON and PWM duty cycle is greater than 60 percent for 5 s.
  10. The gear ratios listed below should be in range when the specific gear while the TCC is On: The 2nd gear ratio is between 2.20-2.53. The 3rd gear ratio is between 1.44-1.65. The 4th gear ratio is between 1.07-1.23. The 5th gear is between 0.79-0.91. The 6th gear is between 0.62-0.72.

P0742

  1. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, P0741, P2763, or P2764 is not set.
  2. DTC P0742 has not passed this key ON.
  3. Ignition voltage is between 8.6-32 V.
  4. The engine speed is 400-7,500 RPM for 5 s.
  5. The transmission fluid temperature is -6.6 to +130°C (+20 to +266°F).
  6. The accelerator pedal position signal is valid.
  7. The throttle position is greater than 8 percent.
  8. The TCM must receive a valid torque signal from the ECM.
  9. The engine torque is greater than 115 N.m (85 lb ft).
  10. The vehicle speed is greater than 16 km/h (10 mph).
  11. The gear ratio is between 0.62-1.63.
  12. The commanded gear is 2nd.
  13. The TCC is commanded OFF.

P0741

  1. The TCC Pressure is greater than 750 Kpa (109 PSI) for 6 s.
  2. The TCM detects TCC slip greater than 130 RPM for 5 s when the TCC is commanded ON. This condition must occur 2 times.

P0742

  1. The TCM detects the TCC slip between -50 and +13 RPM for 6 s when the TCC is commanded OFF.
  2. The above condition must occur 2 times.

P0741

  1. DTC P0741 is a Type B DTC.
  2. The TCM inhibits TCC.
  3. The TCM inhibits high gear in hot mode.
  4. The TCM freezes transmission adaptive functions.

P0742

  1. DTC P0742 is a Type A DTC.
  2. The TCM disables neutral idle.
  3. The TCM enables high gear in hot mode.
  4. The TCM freezes transmission adaptive functions.
  1. DTC P0741 is a Type B DTC.
  2. DTC P0742 is a Type A DTC.

Before performing a road test, configure and setup the scan tool for snapshot mode. This will allow you to display, monitor, and verify multiple transmission data parameters at one time, after the road test.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  3. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  4. «Park - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__park-engine-running)
  5. «Reverse»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__reverse)
  6. «Neutral - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__neutral-engine-running)
  7. «Drive Range, First Gear Engine Braking»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear-engine-braking)
  8. «Drive Range, First Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear)
  9. «Drive Range, Second Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-second-gear)
  10. «Drive Range, Third Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear)
  11. «Drive Range, Third Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear-default)
  12. «Drive Range - Fourth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fourth-gear)
  13. «Drive Range, Fifth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear)
  14. «Drive Range, Fifth Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear-default)
  15. «Drive Range, Sixth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-sixth-gear)
  16. «Fluid Passages»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825 Control Solenoid Test Plate

For equivalent regional tools, refer to Special Tools .

  1. Engine idling in Park position, with parking brake applied and drive wheels chocked.
  2. Verify the transmission fluid level and condition is correct. Refer to «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) . If the transmission fluid level and condition is not correct Repair as necessary. If the transmission fluid level and condition is correct
  3. Ignition ON, clear the Transmission Control Module DTCs with a scan tool.
  4. Verify the transmission operation performs as indicated in the road test instructions and DTCs P0741 or P0742 did not set. Refer to «Road Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__road-test) . If DTC P0741 or P0742 set Refer to Circuit/System Testing. If DTC P0741 or P0742 did not set
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Verify the transmission line pressures are within the specified ranges. Refer to «Line Pressure Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures) . If pressures are not within range Refer to «Fluid Pressure High or Low»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__fluid-pressure-high-or-low) . If pressures are within range
  2. Ignition OFF. Remove the Q8 Control Solenoid Valve Assembly.
  3. Verify a pressure change occurs for each solenoid when performing the solenoid test. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If a pressure change does not occur Replace the Q8 Control Solenoid Valve Assembly. If a pressure change does occur
  4. Verify the conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.

P0741 or P0742 - A/Trans Fluid Pump cover Assembly (219)

  1. TCC Control Valve (227) stuck/sticking - debris, binding, damaged valve, or scored bore.
  2. Converter Feed Limit Valve (220) stuck/sticking - debris, binding, damaged valve, or scored bore.
  3. Pressure Regulator Valve (233) stuck/sticking - debris, binding, damaged valve, or scored bore.
  4. Turbine Shaft Bushings (218), (228) damaged or loose.
  5. Leak between stator/tower assembly and cover.

P0741 - 4-5-6 (w/Turbine Shaft) Housing Assembly (441)

TCC Turbine Shaft O-ring Seal (443) damaged or leaking.

P0741 - Torque Converter Assembly (1)

  1. TCC friction material debonded or excessively worn.
  2. One way stator clutch distressed.
  3. Internal leak - missing or damaged seal.
  4. Overheated due to lack of lubrication/cooler flow.

P0741 or P0742 - Lower Control Valve Body Assembly (351)

  1. TCC Regulator Apply Valve (355) stuck/sticking - debris, binding, damaged valve, or scored bore. Bore plug (328) undersized or leaking.
  2. Clutch Select Valve 2 (352) stuck/sticking - debris, binding, damaged valve, or scored bore.

P0741 or P0742 - Q8 Control Solenoid Valve Assembly (314)

TCM incorrectly reporting high OSS, causing early TCC apply or late TCC release.

P0742 - A/Trans Input and Output Speed Sensor Assembly (303)

Incorrect, high, OSS signal, causing early TCC apply or late TCC release.

P0741 - Control Solenoid Valve Assembly (21)

A/Trans Fluid Pump Seal Assembly (18) damaged or leaking.

P0741 - Torque Converter Diagnosis

P0742 - Torque Converter Diagnosis

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

DTC Descriptor

Note. The DTCs listed below set due to a transmission hydraulic/mechanical condition. Perform the Circuit/System Verification and Circuit/System Testing to identify the cause.

The shift solenoid 1 is part of the control solenoid valve assembly which has no serviceable parts. The control solenoid valve assembly is attached to the lower control valve body. The solenoid operates by the Transmission Control Module opening or closing the ground circuit. With the solenoid circuit grounded (solenoid on), the internal plunger and metering ball block the exhaust fluid creating signal fluid pressure. The signal fluid acts against the clutch select valve 2 to overcome the valve spring force moving it to the apply position, allowing the shift. The shift solenoid 1 is commanded ON in Park, Reverse, Neutral and Drive 1 Engine Braking, and commanded OFF in Drive 1-6 gear ranges.

  1. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
  2. Ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.
  4. The internal mode switch range is not PARK, NEUTRAL or REVERSE.
  5. High Side Driver is enabled.
  6. The transmission fluid temperature is -6.6°C (20.12°F).
  7. Accelerator pedal position signal is valid.
  8. The throttle position signal is valid.
  9. The output shaft speed is 0 RPM or greater.
  10. The TCM must receive a valid torque signal from the ECM.

P0751

  1. 1st gear is commanded.
  2. TCM detects a gear ratio of 1.09-1.20.
  3. Gear slip is greater than 400 RPM for 2 s.
  4. The above conditions have to occur 8 times to set.

P0752

  1. 3rd gear is commanded.
  2. Transmission has achieved 1st or 2nd gear.
  3. Gear slip is 400 RPM for 1.5 s.
  4. TCM commands 4th gear if the above condition exist and detects a gear ratio of 3.82-4.22 for 1.5 s.
  5. The above conditions have to occur 5 times.

P0751

  1. DTC P0751 is a Type B DTC.
  2. TCM inhibits 1st gear.
  3. TCM inhibits neutral idle.

P0752

  1. DTC P0752 is a Type A DTC.
  2. TCM freezes transmission adaptive functions.
  3. TCM commands maximum line pressure.
  4. TCM inhibits Tap Up/Down function.
  5. TCM inhibits manual shifting of forward gears.
  6. TCM commands second gear if output is less than 1,350 RPM, or neutral if output speed is 1,350 RPM or greater.
  7. TCM inhibits neutral idle.
  1. DTC P0751 is a Type B DTC.
  2. DTC P0752 is a Type A DTC.

Before performing a road test, configure and setup the scan tool for snapshot mode. This will allow you to display, monitor, and verify multiple transmission data parameters at one time, after the road test.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  3. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  4. «Park - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__park-engine-running)
  5. «Reverse»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__reverse)
  6. «Neutral - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__neutral-engine-running)
  7. «Drive Range, First Gear Engine Braking»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear-engine-braking)
  8. «Drive Range, First Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear)
  9. «Drive Range, Second Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-second-gear)
  10. «Drive Range, Third Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear)
  11. «Drive Range, Third Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear-default)
  12. «Drive Range - Fourth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fourth-gear)
  13. «Drive Range, Fifth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear)
  14. «Drive Range, Fifth Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear-default)
  15. «Drive Range, Sixth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-sixth-gear)
  16. «Fluid Passages»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. DT-47825 Control Solenoid Test Plate
  2. J 21867 Pressure Gauge

For equivalent regional tools, refer to Special Tools .

  1. Engine idling in Park position, with parking brake applied and drive wheels chocked.
  2. Verify the transmission fluid level and condition is correct. Refer to «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) . If the transmission fluid level and condition is not correct Repair as necessary. If the transmission fluid level and condition is correct
  3. From a stop, accelerate to 72 km/h (45 mph) with the scan tool Calculated Throttle Position greater than 20 percent. Perform this test 8 times.
  4. Verify DTC P0751 or P0752 did not set. If DTC P0751 or P0752 set Refer to Circuit/System Testing. If DTC P0751 or P0752 did not set
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Verify the transmission line pressures are within the specified ranges. Refer to «Line Pressure Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures) . If line pressures are not within range Refer to «Fluid Pressure High or Low»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__fluid-pressure-high-or-low) . If line pressures are within range
  2. Ignition OFF. Remove the Q8 Control Solenoid Valve Assembly.
  3. Verify a pressure change occurs for each solenoid when performing the solenoid test. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If a pressure change does not occur for each solenoid Replace the Q8 Control Solenoid Valve Assembly. If a pressure change does occur for each solenoid
  4. Verify the mechanical conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.

P0751 or P0752 - Lower Control Valve Body

Clutch select valve 2 stuck - debris, sediment, binding or scored bore.

P0751 - Upper Control Valve Body

Bore Plug - Clutch Select Valve 2, Leaking, undersized bore plug, or damaged.

P0751 - Upper Control Valve Body

  1. Check Ball #2 missing, damaged, or leaking.
  2. Check Ball #2 Seat damaged or leaking.

P0751 or P0752 - Q8 Control Solenoid Valve Assembly

Shift Solenoid 1

  1. O-ring seals leaking.
  2. Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Note. The DTCs listed below set due to a transmission hydraulic/mechanical condition. Perform the Circuit/System Verification and Circuit/System Testing to identify the cause.

The shift solenoid valve 2 is part of the control solenoid valve assembly which has no serviceable parts. The control solenoid valve assembly is attached to the lower control valve body. The solenoid operates by the Transmission Control Module opening or closing the ground circuit. With the solenoid circuit grounded (solenoid on), the internal plunger and metering ball block the exhaust fluid creating signal fluid pressure. The signal fluid acts against the clutch select valve 3 to overcome the valve spring force moving it to the apply position, allowing the shift. The shift solenoid 2 is commanded OFF in Reverse, and commanded ON in Park, Neutral, Drive 1 Engine Braking, and Drive 1-6 gear ranges.

  1. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
  2. Ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.
  4. High Side Driver 1 is enabled.
  5. The Throttle Position signal voltage is valid.
  6. Throttle position is 0.5 percent or greater.
  7. Transmission fluid temperature is -6.6°C (20.12°F) or greater.
  8. The Transmission Output Speed is 67 RPM or greater.
  1. Commanded gear is 1st locked.
  2. Transmission gearbox slip is 400 RPM for 10 s.
  3. The transmission commands 2nd gear if the above condition exists and detects a ratio of 2.72-3.01 for 1 s.
  4. The above condition has to occur 3 times.
  1. The TCM freezes the shift adapts function.
  2. The TCM commands maximum line pressure.
  3. The TCM inhibits neutral idle.
  4. The TCM inhibits Tap Up/Down function.
  5. The TCM inhibits Tow/Haul function.
  6. The TCM commands Neutral if the transmission output speed is 1,350 RPM or greater.
  7. The TCM commands 2nd gear if the transmission output speed is less than 1,350 RPM.

DTC P0756 is a Type A DTC.

Before performing a road test, configure and setup the scan tool for snapshot mode. This will allow you to display, monitor, and verify multiple transmission data parameters at one time, after the road test.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  3. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  4. «Park - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__park-engine-running)
  5. «Reverse»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__reverse)
  6. «Neutral - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__neutral-engine-running)
  7. «Drive Range, First Gear Engine Braking»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear-engine-braking)
  8. «Drive Range, First Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear)
  9. «Drive Range, Second Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-second-gear)
  10. «Drive Range, Third Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear)
  11. «Drive Range, Third Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear-default)
  12. «Drive Range - Fourth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fourth-gear)
  13. «Drive Range, Fifth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear)
  14. «Drive Range, Fifth Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear-default)
  15. «Drive Range, Sixth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-sixth-gear)
  16. «Fluid Passages»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. DT-47825 Control Solenoid Test Plate
  2. J 21867 Pressure Gauge

For equivalent regional tools, refer to Special Tools .

  1. Engine idling in Park position, with parking brake applied and drive wheels chocked.
  2. Verify the transmission fluid level and condition is correct. Refer to «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) . If the transmission fluid level and condition is not correct Repair as necessary. If the transmission fluid level and condition is correct
  3. Ignition ON, clear the Transmission Control Module DTCs with a scan tool.
  4. Verify the transmission operation performs as indicated in the road test instructions and DTC P0756 did not set. Refer to «Road Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__road-test) . If DTC P0756 is set Refer to Circuit/System Testing. If DTC P0756 did not set
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Verify the transmission line pressures are within the specified ranges. Refer to «Line Pressure Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures) . If pressures are not within range Refer to «Fluid Pressure High or Low»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__fluid-pressure-high-or-low) . If pressures are within range
  2. Ignition OFF. Remove the Q8 Control Solenoid Valve Assembly.
  3. Verify a pressure change occurs for each solenoid when performing the solenoid test. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If a pressure change does not occur Replace the Q8 Control Solenoid Valve Assembly. If a pressure change does occur
  4. Verify the conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.

P0756 - Lower Control Valve Body (351)

Clutch select valve 3 stuck off - debris, sediment, binding or scored bore.

P0756 - Lower Control Valve Body (351)

Bore Plug - Clutch Select Valve 3 leaking, undersized bore plug, damaged.

P0756 - Lower Control Valve Body (351)

  1. Check Ball #3 missing, damaged, leaking.
  2. Check Ball #3 Spacer plate seat damaged, leaking.

P0756 - Q8 Control Solenoid Valve Assembly (314)

Shift Solenoid (SS) 2

  1. O-ring seals leaking.
  2. Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal.

P0756 - 1-2-3-4 and 3-5-R Clutch Housing Assembly (51)

1-2-3-4 clutch backing plate retaining ring not seated, causing the piston to over travel and cut the 1-2-3-4 clutch piston seal.

P0756 - Fluid Pump Cover Assembly

Fluid pump cover vanes and fluid pump rotor broken.

P0756 - Low Clutch Sprag Assembly

Broken or incapable of holding torque.

P0756 - Pump Seal

Seal is cut, torn causing a leak due to pump speed and capacity.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Note. The DTCs listed below set due to a transmission hydraulic/mechanical condition. Perform the Circuit/System Verification and Circuit/System Testing to identify the cause.

The clutch pressure control solenoid valve 2 is part of the control solenoid valve assembly, which has no serviceable parts. The pressure control solenoid valve 2 regulates transmission fluid pressure to the 3-5-Reverse clutch regulator valve which controls pressure to the 3-5-Reverse clutch. The Transmission Control Module calculates gear ratio based on the RPM signals from the input speed sensor (ISS) and the output speed sensor (OSS). The Transmission Control Module compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear.

P0776

  1. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.
  4. The transmission temperature is -6.6°C (20.12°F) or greater.
  5. The throttle position signal is valid.
  6. High side driver is enabled.
  7. The transmission output speed sensor is 67 RPM or greater or the accelerator pedal position sensor is 0.5 percent or greater.

P0777

  1. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.
  4. The transmission temperature is -6.6°C (20.12°F) or greater.
  5. The throttle position signal is valid.
  6. High side driver is enabled.
  7. The transmission output speed sensor is 67 RPM or greater or the accelerator pedal position sensor is 0.5 percent or greater.

P0776

The Transmission Control Module has detected an incorrect gear ratio or neutral condition when the 3-5-R clutch is commanded ON. This condition must occur 3 times.

P0777

The Transmission Control Module has detected an incorrect gear ratio change when the 3-5-R clutch is commanded OFF during a shift or when 3rd gear ratio is detected in 1st gear. This condition must occur 3 times.

P0776

  1. DTC P0776 is a Type A DTC.
  2. The TCM commands maximum line pressure.
  3. The TCM inhibits Tow/Haul mode.
  4. The TCM freezes transmission adaptive functions.
  5. The TCM inhibits TAP Up/Down function.
  6. The TCM inhibits Manual Up/Down Shift with the shift selector.
  7. The TCM inhibits auto grade braking.
  8. The TCM limits the transmission to 2nd gear if the output speed sensor signal is less than 1,400 RPM. No upshift will occur.
  9. The TCM limits the transmission to 4th gear if the output speed sensor signal is 1,400 RPM or greater.

P0777

  1. DTC P0777 is a Type A DTC.
  2. The TCM commands maximum line pressure.
  3. The TCM inhibits Tow/Haul mode.
  4. The TCM freezes transmission adaptive functions.
  5. The TCM inhibits TAP Up/Down function.
  6. The TCM inhibits Manual Up/Down Shift with the shift selector.
  7. The TCM limits the transmission to Reverse gear and 3rd gear operation.
  8. The TCM inhibits auto grade braking.

DTCs P0776 and P0777 are Type A DTCs.

Before performing a road test, configure and setup the scan tool for snapshot mode. This will allow you to display, monitor, and verify multiple transmission data parameters at one time, after the road test.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  3. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  4. «Park - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__park-engine-running)
  5. «Reverse»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__reverse)
  6. «Neutral - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__neutral-engine-running)
  7. «Drive Range, First Gear Engine Braking»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear-engine-braking)
  8. «Drive Range, First Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear)
  9. «Drive Range, Second Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-second-gear)
  10. «Drive Range, Third Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear)
  11. «Drive Range, Third Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear-default)
  12. «Drive Range - Fourth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fourth-gear)
  13. «Drive Range, Fifth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear)
  14. «Drive Range, Fifth Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear-default)
  15. «Drive Range, Sixth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-sixth-gear)
  16. «Fluid Passages»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. DT-47825 Control Solenoid Test Plate
  2. J 21867 Pressure Gauge

For equivalent regional tools, refer to Special Tools .

  1. Engine idling in Park position, with parking brake applied and drive wheels chocked.
  2. Verify the transmission fluid level and condition is correct. Refer to «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) . If the transmission fluid level and condition is not correct Repair as necessary. If the transmission fluid level and condition is correct
  3. Ignition ON, clear the Transmission Control Module DTCs with a scan tool.
  4. Verify the transmission operation performs as indicated in the road test instructions and DTCs P0776 or P0777 did not set. Refer to «Road Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__road-test) . If DTCs P0776 or P0777 are set Refer to Circuit/System Testing. If DTCs P0776 or P0777 did not set
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Verify the transmission line pressures are within the specified ranges. Refer to «Line Pressure Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures) . If pressures are not within range Refer to «Fluid Pressure High or Low»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__fluid-pressure-high-or-low) . If pressures are within range
  2. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
  3. Verify a pressure change occurs for each solenoid when performing the solenoid test. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If a pressure change does not occur Replace the Q8 Control Solenoid Valve Assembly. If a pressure change does occur
  4. Verify the conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.

P0776 - Control Valve Upper Body Assembly (304)

3-5-R Regulator Valve (336) stuck/sticking - debris, binding, damaged valve, or scored bore.

P0776 - Control Valve Upper Body Assembly (304)

B-2-6 Regulator Valve (334) stuck/sticking - debris, binding, damaged valve, or scored bore.

P0776 or P0777 - Q8 Control Solenoid Valve Assembly (314)

  1. O-ring seals leaking.
  2. Valve body filter plate assembly cracked, blocked or damaged gasket seal.

P0776 or P0777 - Control Valve Upper Body Assembly (304)

  1. Actuator feed limit circuit supply fluid to solenoids restricted or not available, debris or sediment blockage.
  2. B-R-1/4-5-6 clutch regulator valve (327) not in the applied position - debris, binding, damaged valve, or scored bore.
  3. 4-5-6 clutch boost valve (329) not exhausting - debris, binding, damaged valve, or scored bore.

P0776 or P0777 - Torque Converter (w/Fluid Pump) Housing Assembly (2)

Fluid pump housing vanes/rotor/slide damaged/scored.

P0776 or P0777 - A/Trans Fluid Pump Cover Assembly (219)

Isolator valve (236) stuck/sticking - debris, binding, damaged valve, or scored bore.

P0776 - 1-2-3-4 and 3-5-R Clutch Housing Assembly (51)

3-5-R clutch backing plate retaining ring (400) not seated.

P0776 or P0777 - 1-2-3-4 and 3-5-R Clutch Housing Assembly (51)

1-2-3-4 clutch backing plate retaining ring (429) not seated, causing clutch pack/piston over travel.

P0776 - 4-5-6 Hub/ Shaft Assembly (58)

4-5-6 Hub/Shaft - broken hub weld.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Note. The DTCs listed below set due to a transmission hydraulic/mechanical condition. Perform the Circuit/System Verification and Circuit/System Testing to identify the cause.

The clutch pressure control solenoid 3 is part of the control solenoid valve assembly, which has no serviceable parts. The Clutch Pressure Control Solenoid 3 regulates transmission fluid pressure to the CBR1/C 4-5-6 clutch regulator valve which controls pressure to the low/reverse clutch and the 4-5-6 clutch. The Transmission Control Module calculates gear ratio based on the RPM signals from the input speed sensor (ISS) and the output speed sensor (OSS). The Transmission Control Module compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear.

P0796

  1. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.
  4. The transmission temperature is -6.6°C (20.12°F) or greater.
  5. The throttle position signal is valid.
  6. High side driver is enabled.
  7. The transmission output speed sensor signal is 67 RPM or greater or the accelerator pedal position sensor signal is 0.5 percent or greater.

P0797

  1. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.
  4. The transmission temperature is -6.6°C (20.12°F) or greater.
  5. The throttle position signal is valid.
  6. High side driver is enabled.
  7. The transmission output speed sensor signal is 67 RPM or greater or the accelerator pedal position sensor signal is 0.5 percent or greater.

P0796

The Transmission Control Module has detected an incorrect gear ratio or neutral condition when the low and reverse clutch and the 4-5-6 clutch is commanded ON. This condition must occur 3 times.

P0797

The Transmission Control Module has detected an incorrect gear ratio change when the low and reverse clutch and the 4-5-6 clutch is commanded OFF during a shift or when 4th gear ratio is detected in 1st gear. This condition must occur 3 times.

P0796

  1. DTC P0796 is a Type A DTC.
  2. The TCM commands maximum line pressure.
  3. The TCM inhibits Tow/Haul mode.
  4. The TCM freezes transmission adaptive functions.
  5. The TCM inhibits TAP Up/Down function.
  6. The TCM inhibits Manual Up/Down Shift with the shift selector.
  7. The TCM limits the transmission to Reverse gear and 2nd gear operation.
  8. The TCM inhibits neutral idle.
  9. The TCM inhibits auto grade braking.
  10. The TCM limits the transmission to neutral gear if the output speed sensor signal is 1,350 RPM or greater.
  11. The TCM limits the transmission to 2nd gear if the output speed sensor signal is less than 1,350 RPM. No upshift will occur.

P0797

  1. DTC P0797 is a Type A DTC.
  2. The TCM commands maximum line pressure.
  3. The TCM inhibits Tow/Haul mode.
  4. The TCM freezes transmission adaptive functions.
  5. The ECM/TCM enables torque management.
  6. The TCM inhibits TAP Up/Down function.
  7. The TCM inhibits Manual Up/Down Shift with the shift selector.
  8. The TCM limits the transmission to Reverse gear and 4th gear operation.

DTCs P0796 and P0797 are Type A DTCs.

Before performing a road test, configure and setup the scan tool for snapshot mode. This will allow you to display, monitor, and verify multiple transmission data parameters at one time, after the road test.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  3. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  4. «Park - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__park-engine-running)
  5. «Reverse»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__reverse)
  6. «Neutral - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__neutral-engine-running)
  7. «Drive Range, First Gear Engine Braking»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear-engine-braking)
  8. «Drive Range, First Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear)
  9. «Drive Range, Second Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-second-gear)
  10. «Drive Range, Third Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear)
  11. «Drive Range, Third Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear-default)
  12. «Drive Range - Fourth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fourth-gear)
  13. «Drive Range, Fifth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear)
  14. «Drive Range, Fifth Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear-default)
  15. «Drive Range, Sixth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-sixth-gear)
  16. «Fluid Passages»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. DT-47825 Control Solenoid Test Plate
  2. J 21867 Pressure Gauge

For equivalent regional tools, refer to Special Tools .

  1. Engine idling in Park position, with parking brake applied and drive wheels chocked.
  2. Verify the transmission fluid level and condition is correct. Refer to «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) . If the transmission fluid level and condition is not correct Repair as necessary. If the transmission fluid level and condition is correct
  3. Ignition ON, clear the Transmission Control Module DTCs with a scan tool.
  4. Verify the transmission operation performs as indicated in the road test instructions and DTCs P0796 or P0797 did not set. Refer to «Road Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__road-test) . If DTC P0796 or P0797 set Refer to Circuit/System Testing. If DTC P0796 or P0797 did not set
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Verify the transmission line pressures are within the specified ranges. Refer to «Line Pressure Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures) . If pressures are not within range Refer to «Fluid Pressure High or Low»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__fluid-pressure-high-or-low) . If pressures are within range
  2. Ignition OFF. Remove the Q8 Control Solenoid Valve Assembly.
  3. Verify a pressure change occurs for each solenoid when performing the solenoid test. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If a pressure change does not occur for each solenoid Replace the Q8 Control Solenoid Valve Assembly. If a pressure change does occur for each solenoid
  4. Verify the conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.

P0796 or P0797 - Control Valve Upper Body Assembly (304)

4-5-6 Regulator Valve (327) stuck/sticking - debris, binding, damaged valve, or scored bore.

P0796 - 4-5-6 Clutch Housing Assembly (441)

Turbine Shaft Seals (442) damaged or leaking.

P0796 or P0797 - Q8 Control Solenoid Valve Assembly (314)

  1. O-ring seals leaking.
  2. Valve body filter plate assembly cracked, blocked or damaged gasket seal.

P0796 or P0797 - Control Valve Lower Body Assembly (307)

Clutch select valve (352) stuck/ sticking - debris, binding, damaged valve, or scored bore.

P0796 - 4-5-6 Clutch Housing Assembly (441)

4-5-6 Clutch Piston Assembly (439) damaged/ leaking.

P0796 - Transmission Cooling/Lubrication

  1. Restriction/leak in OAC, oil to air, cooler/radiator.
  2. Restricted/leaking/kinked/damaged transmission oil cooler lines.
  3. Restriction/leak in transmission fluid pump assembly.

P0796 - Torque Converter (w/Fluid Pump) Housing Assembly (2)

  1. Fluid pump housing vanes/rotor/slide damaged/scored.
  2. Fluid pump or torque converter overstressed due to high temperature.

P0796 - 4-5-6 Hub/Shaft Assembly (58)

4-5-6 Hub/Shaft - broken hub weld.

P0796 - Automatic Transmission Fluid Filter Assembly (26)

Oil filter (26) or filter seal (25) loose or damaged.

P0796 - 1-2-3-4 and 3-5-R Clutch Housing Assembly (51)

1-2-3-4 Clutch Backing Plate Retaining Ring (429) not seated/oriented, causing clutch pack/piston over travel.

P0796 - Control (with body and valve) Valve Assembly (21)

Valve Body to Pump Transfer Seal Assembly (18) damaged/leaking.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
SignalP0815, P0816, P0826, P1876P0815, P0816, P0826, P1876P0815, P0816, P0826, P1876
GroundP0826P0826P0826
CircuitShort to GroundOpen/High ResistanceShort to Voltage
SignalInactiveInactiveInactive
Ground

Driver Shift Request

The driver shift request, also known as the TAP Up/Downshift manual shift function, allows the driver to select the desired range of gears for current driving conditions. The driver shift request shift system is activated when the gear selector is in the manual position. The driver shift request system is deactivated in all other range positions. Pressing the plus (+) switch once will command the Body Control Module to signal the Transmission Control Module to upshift to the next high gear. Pressing the minus (-) switch once will command the Body Control Module to signal the Transmission Control Module to downshift to the next lowest or previous gear. The Transmission Control Module will not allow a downshift if the transmission is compromised by over-speeding. The automatic transmission manual shift switch is comprised of three different resistors values in series and two switches. The Body Control Module supplies a 12 volt circuit to the automatic transmission manual shift switch. The signal circuit varies the voltage back to the Body Control Module depending on which switch is depressed.

P0815

  1. DTC P0816, P0826, P182E, P1876, P1877, P1915 or P1761 is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.

P0816

  1. DTC P0815, P0826, P182E, P1876, P1877, P1915 or P1761 is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.

P0826

  1. DTC P1761 is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.

P1876

  1. DTC U0100, P0815, P0816, P0826, P1761, P1825, P1877 or P1915 is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.

P0815 - Condition 1

The TCM detects a stuck ON Tap Up switch for 1 s in Park or Neutral.

P0815 - Condition 2

The TCM detects a stuck ON Tap Up switch for 10 min in any forward gear.

P0816 - Condition 1

The TCM detects a stuck ON Tap Down switch for 1 s in Park or Neutral.

P0816 - Condition 2

The TCM detects a stuck ON Tap Down switch for 10 min in any forward gear.

P0826

The TCM detects an invalid voltage on the TAP up/down signal circuit for 1 min.

P1876

The TCM detects a TAP Enable Switch request 3 times when not in M (D6) range for 2 s.

  1. DTCs P0815, P0816, P0826, and P1876 are Type C DTCs.
  2. The BCM disables TAP shift operation.

DTCs P0815, P0816, P0826, and P1876 are Type C DTCs.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

DTC Type Reference

  1. Ignition ON, verify the scan tool K9 Body Control Module changes from OFF to ON while placing the S3 Transmission Shift Lever into the manual mode position. If ON is not displayed Refer to Circuit/System Testing. If ON is displayed
  2. Verify the scan tool K9 Body Control Module parameter displays UP when pressing the plus (+) switch and Down when pressing the minus (-) switch. If the parameter does not display the correct value Refer to Circuit/System Testing. If the parameter does display the correct value
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  5. All OK.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S3 Transmission Shift Lever. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 ohms between the ground circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If greater than 2 ohms, repair the Open/High resistance in the circuit. If less than 2 ohms, repair the ground connection. If less than 10 ohms
  3. Ignition ON.
  4. Test for 11-13 V between the signal circuit terminal 3 and ground. If not between 11-13 V Ignition OFF, disconnect the connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground in the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If between 11-13 V
  5. Ignition OFF, connect the harness connector at the S3 Transmission Shift Lever, Ignition ON, transmission shift lever in the M or manual mode position.
  6. Test for voltage between the S3 Transmission Shift Lever connector signal circuit terminal 3 and ground, by back probing the connector, for the conditions listed below: 1.8-4.7 V - Plus button pressed 4.9-7.4 V - Minus button pressed 7.9-10.7 V - Neither button pressed If voltage values are not correct Replace the S3 Transmission Shift Lever. If voltage values are correct
  7. Replace the K9 Body Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Replace the AT shift program switch. Refer to «Transmission Control Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Transmission Fluid Pressure Switch 1 is part of the control solenoid valve assembly which has no serviceable parts. The Transmission Control Module supplies a signal circuit to the Transmission Fluid Pressure Switch 1. The Transmission Fluid Pressure Switch 1 has an internal case ground. Transmission Fluid Pressure Switch 1 is normally closed or LOW. When oil pressure is present at the Transmission Fluid Pressure Switch 1, the switch is open or HIGH. The normally high clutch pressure control (PC) solenoid 2 controls pressure to the 3-5 reverse clutch regulator valve. The Transmission Control Module monitors the Transmission Fluid Pressure Switch 1 to determine the position of the 3-5 reverse clutch regulator valve. When the 3-5 reverse clutch is commanded OFF, pressure is present on the Transmission Fluid Pressure Switch 1. When the 3-5 reverse clutch is commanded ON, the 3-5 reverse clutch regulator valve moves and pressure to the Transmission Fluid Pressure Switch 1 is exhausted through the 3-5 reverse clutch regulator valve.

P0842 or P0843

  1. DTC P0711, P0712, P0713, P0716, P0717, P0722, P0723, P0751, P0742, P0756, P0757, P0973, P0974, P0976, P0977, P1915, or P182E is not set.
  2. Ignition voltage is between 8.6-32 V.
  3. The transmission fluid temperature is -6.6°C (20.12°F).
  4. Engine speed is between 400-7,500 RPM for 5 s.
  5. The high side driver is commanded ON.
  6. The engine speed is 550 RPM or greater in Drive 1-6 range.

P0842

The Transmission Control Module detects that the Transmission Fluid Pressure Switch 1 signal voltage remains LOW after the 3-5-R clutch transitions from a HIGH pressure state to a LOW pressure state. The Transmission Control Module counts each incident. The DTC sets when 25 counts are accumulated.

P0843

The Transmission Control Module detects that the Transmission Fluid Pressure Switch 1 signal voltage remains HIGH after the 3-5-R clutch transitions from a LOW pressure state to a HIGH pressure state. The Transmission Control Module counts each incident. The DTC sets when 24 counts are accumulated.

  1. DTCs P0842 and P0843 are Type C DTCs.
  2. The Transmission Control Module freezes transmission adaptive functions for the 3-5-Reverse clutch.

DTCs P0842 and P0843 are Type C DTCs.

A Transmission Fluid Pressure Switch may malfunction due to normal debris in the transmission fluid causing a Transmission Fluid Pressure Switch DTC to intermittently set. This type of condition should not be immediately noticeable to a customer, as the switch outputs are used for shift adaptive pressure and do not cause transmission symptoms unless the switch malfunctions continuously for an extended period of time.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  3. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tool Reference

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Engine idling in Park with parking brake applied, and drive wheels chocked.
  2. Verify the scan tool parameters listed below display the correct values for each gear range while placing the gear select lever in Park, Reverse, and Neutral position. Refer to «Transmission Fluid Pressure Switch Logic»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__transmission-fluid-pressure-switch-logic) for the correct gear range states. Transmission Fluid Pressure Switch 1 Transmission Fluid Pressure Switch 3 Transmission Fluid Pressure Switch 4 Transmission Fluid Pressure Switch 5 If the correct state is not displayed Refer to Circuit/System Testing. If the correct state is displayed
  3. Place the gear select lever in Drive range.
  4. Verify the scan tool parameters listed below display the correct values for each gear range while commanding the scan tool to Shift Transmission Gear through all forward ranges. Refer to «Transmission Fluid Pressure Switch Logic»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__transmission-fluid-pressure-switch-logic) for the correct gear range states. Transmission Fluid Pressure Switch 1 Transmission Fluid Pressure Switch 3 Transmission Fluid Pressure Switch 4 Transmission Fluid Pressure Switch 5 If the correct state is not displayed Refer to Circuit/System Testing. If the correct state is displayed
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Ignition OFF. Remove the Q8 Control Solenoid Valve Assembly.
  2. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  3. Connect the DT-47825-10 jumper harness between the vehicle wire harness electrical connector and the Q8 control solenoid valve assembly electrical connector. Ignition ON.
  4. Verify the scan tool parameters listed below change states when gently pushing on each Transmission Fluid Pressure Switch with the eraser end of a pencil. Transmission Fluid Pressure Switch 1 Transmission Fluid Pressure Switch 3 Transmission Fluid Pressure Switch 4 Transmission Fluid Pressure Switch 5 If any parameter does not change Replace the Q8 Control Solenoid Valve Assembly. If all parameters change
  5. Verify the channel plate, spacer plate, and filter plate do not have a restricted or blocked orifice. Repair or replace as necessary.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Park/Neutral SignalP0850/P0851P0850/P0852P0850/P0852
CircuitShort to GroundOpen/High ResistanceShort to Voltage
Operating Conditions: Engine running, normal operating temperature, range selector in Park. Parameter Normal Range: 12 Volts = In-Gear, 0 Volts = Park/Neutral
Park/Neutral SignalPark/NeutralIn-GearIn-Gear

PNP Switch

The transmission manual shift shaft switch assembly, also known as the internal mode switch, is a sliding contact switch attached to the manual shift shaft inside the transmission case. The park/neutral position switch is integrated into the internal mode switch and connects to the Transmission Control Module lead-frame through a short wire harness. The circuit uses the Transmission Control Module as a pass-through connector only.

The Park/Neutral Signal is sent from the park/neutral switch directly to the engine control module (ECM) and is used for engine start enable.

  1. Ignition voltage is between 11-18 volts.
  2. Engine Speed is 1000 RPM or greater.
  3. TP is 8 percent or greater.
  4. Engine torque is 75 N.m (55 lb ft) or greater.
  5. Vehicle speed is 10 km/h (6 mph) or greater.

P0850 or P0851

The ECM detects the Park/Neutral switch signal equals 0 V, Low, when the IMS reports a Drive range.

P0852

The ECM detects the Park/Neutral switch signal equals 12 V, High, when the IMS reports a Park/Neutral range.

  1. DTCs P0850, P0851, and P0852 are Type C DTCs.
  2. The ECM uses IMS Range for engine start-up.

DTCs P0850, P0851, and P0852 are Type C DTCs.

Schematic Reference

  1. «Automatic Transmission Controls Schematics»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-schematic-wiring-diagrams)
  2. «Engine Controls Schematics»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-36l-lfx-schematic-wiring-diagrams)

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  2. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  3. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Verify the range selector cable is adjusted correctly. Refer to «Range Selector Lever Cable Adjustment»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle__range-selector-lever-cable-adjustment) . If the cable adjustment is not OK Adjust, repair or replace as necessary. If the cable adjustment is OK
  2. Ignition ON.
  3. Verify the scan tool Engine Control Module Park/Neutral Position Switch parameter displays Park/Neutral when in Park or Neutral and In-Gear when in Reverse or Drive Range. If Park/Neutral or In-Gear is not displayed Refer to Circuit/System Testing. If Park/Neutral or In-Gear is displayed
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  5. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  6. All OK.

Note. You must perform Circuit/System Verification first.

  1. Ignition OFF, disconnect the X1 harness connector at the Q8 Control Solenoid Valve Assembly on the automatic transmission.
  2. Install the DT-47825-10 jumper harness to the X1 vehicle harness connector.
  3. Test for less than 5 ohms between the ground circuit terminal 5 at the DT-47825-10 jumper harness and ground at the transmission case. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit from wire end to wire end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  4. Ignition ON.
  5. Test for 11-13 V between the signal circuit terminal 3 at the DT-47825-10 jumper harness and ground at the transmission case. If not between 11-13 V Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. Test for infinite resistance between the Park/Neutral signal circuit terminal 3 at the DT-47825-10 jumper harness and ground at the transmission case. If less than infinite resistance, repair the short to ground in the signal circuit. If infinite resistance. Test for less than 2 ohms in the Park/Neutral signal circuit wire end to wire end. If 2 ohms or greater, repair the open/high resistance in the signal circuit. If less than 2 ohms, replace the K20 Engine Control Module. If between 11-13 V
  6. Ignition OFF, disconnect the DT-47825-10 jumper harness from the X1 vehicle harness connector.
  7. Connect the DT-47825-10 jumper harness to the Q8 Control Solenoid Valve Assembly harness connector at the transmission case.
  8. Remove the transmission fluid pan.
  9. Disconnect the B15 Transmission Internal Mode Switch electrical connector from the Q8 Control Solenoid Valve Assembly.
  10. Test for less than 2 ohms between the ground circuit terminal 5 and terminal A at the B15 Transmission Internal Mode Switch connector on the Q8 Control Solenoid Valve Assembly. If 2 ohms or greater Replace the Q8 control solenoid valve assembly. If less than 2 ohms
  11. Ignition OFF.
  12. Connect the DT-47825-10 jumper harness to the X1 vehicle harness connector.
  13. Ignition ON.
  14. Test for 11-13 V between terminal F at the B15 Transmission Internal Mode Switch connector on the Q8 Control Solenoid Valve Assembly and ground at the transmission case. If not between 11-13 V Replace the Q8 control solenoid valve assembly. If between 11-13 V
  15. Connect a 3 A fused jumper wire between terminal F at the B15 Transmission Internal Mode Switch on the Q8 Control Solenoid Valve Assembly and ground at the transmission case.
  16. Verify the scan tool Engine Control Module Park/Neutral Position Switch parameter displays Park/Neutral. If Park/Neutral is not displayed Replace the K20 Engine Control Module. If Park/Neutral is displayed
  17. Replace the B15 Transmission Internal Mode Switch.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly or ECM replacement, programming, and setup.
  3. «Manual Shift Shaft Position Switch Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) for IMS replacement.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Transmission Fluid Pressure Switch 3 is part of the control solenoid valve assembly which has no serviceable parts. The Transmission Control Module supplies a signal circuit to the Transmission Fluid Pressure Switch 3. The Transmission Fluid Pressure Switch 3 has an internal case ground. Transmission Fluid Pressure Switch 3 is normally closed or LOW. When oil pressure is present at the Transmission Fluid Pressure Switch 3, the switch is open or HIGH. The normally low clutch pressure control (PC) solenoid 4 controls pressure to the 2-6 clutch regulator valve. The Transmission Control Module monitors the Transmission Fluid Pressure Switch 3 to determine the position of the 2-6 clutch regulator valve. When the 2-6 clutch is commanded OFF, pressure is present on the Transmission Fluid Pressure Switch 3. When the 2-6 clutch is commanded ON, the 2-6 clutch regulator valve moves and pressure is exhausted through the 2-6 clutch regulator valve.

P0872 or P0873

  1. DTC P0711, P0712, P0713, P0716, P0717, P0722, P0723, P0751, P0742, P0756, P0757, P0973, P0974, P0976, P0977, P1915, or P182E is not set.
  2. Ignition voltage is between 8.6-32 V.
  3. The transmission fluid temperature is -6.6°C (20.12°F).
  4. Engine speed is between 400-7,500 RPM for 5 s.
  5. The high side driver is commanded ON.
  6. The engine speed is 550 RPM or greater in Drive 1-6 range.

P0872

The Transmission Control Module detects that the Transmission Fluid Pressure Switch 3 signal voltage remains LOW after the 2-6 clutch transitions from a HIGH pressure state to a LOW pressure state. The Transmission Control Module counts each incident. The DTC sets when 10 counts are accumulated.

P0873

The Transmission Control Module detects that the Transmission Fluid Pressure Switch 3 signal voltage remains HIGH after the 2-6 clutch transitions from a LOW pressure state to a HIGH pressure state. The Transmission Control Module counts each incident. The DTC sets when 15 counts are accumulated.

  1. DTCs P0872 and P0873 are Type C DTCs.
  2. The Transmission Control Module freezes transmission adaptive functions for the 2-6 clutch.

DTCs P0872 and P0873 are Type C DTCs.

A Transmission Fluid Pressure Switch may malfunction due to normal debris in the transmission fluid causing a Transmission Fluid Pressure Switch DTC to intermittently set. This type of condition should not be immediately noticeable to a customer, as the switch outputs are used for shift adaptive pressure and do not cause transmission symptoms unless the switch malfunctions continuously for an extended period of time.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  3. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Engine idling in Park with parking brake applied, and drive wheels chocked.
  2. Verify the scan tool parameters listed below display the correct values for each gear range while placing the gear select lever in Park, Reverse, and Neutral position. Refer to «Transmission Fluid Pressure Switch Logic»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__transmission-fluid-pressure-switch-logic) for the correct gear range states. Transmission Fluid Pressure Switch 1 Transmission Fluid Pressure Switch 3 Transmission Fluid Pressure Switch 4 Transmission Fluid Pressure Switch 5 If the correct state is not displayed Refer to Circuit/System Testing. If the correct state is displayed
  3. Place the gear select lever in Drive range.
  4. Verify the scan tool parameters listed below display the correct values for each gear range while commanding the scan tool to Shift Transmission Gear through all forward ranges. Refer to «Transmission Fluid Pressure Switch Logic»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__transmission-fluid-pressure-switch-logic) for the correct gear range states. Transmission Fluid Pressure Switch 1 Transmission Fluid Pressure Switch 3 Transmission Fluid Pressure Switch 4 Transmission Fluid Pressure Switch 5 If the correct state is not displayed Refer to Circuit/System Testing. If the correct state is displayed
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Ignition OFF. Remove the Q8 Control Solenoid Valve Assembly.
  2. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  3. Connect the DT-47825-10 jumper harness between the vehicle wire harness electrical connector and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  4. Verify the scan tool parameters listed below change states when gently pushing on each Transmission Fluid Pressure Switch with the eraser end of a pencil. Transmission Fluid Pressure Switch 1 Transmission Fluid Pressure Switch 3 Transmission Fluid Pressure Switch 4 Transmission Fluid Pressure Switch 5 If any parameter does not change Replace the Q8 Control Solenoid Valve Assembly. If all parameters change
  5. Verify the channel plate, spacer plate, and filter plate do not have a restricted or blocked orifice. Repair or replace as necessary.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Transmission Fluid Pressure Switch 4 is part of the control solenoid valve assembly which has no serviceable parts. The Transmission Control Module supplies a signal circuit to the Transmission Fluid Pressure Switch 4. The Transmission Fluid Pressure Switch 4 has an internal case ground. Transmission Fluid Pressure Switch 4 is normally closed or LOW. When oil pressure is present at the Transmission Fluid Pressure Switch 4, the switch is open or HIGH. The normally LOW pressure control solenoid 5 controls pressure to the 1-2-3-4 clutch regulator valve. The Transmission Control Module monitors the Transmission Fluid Pressure Switch 4 to determine the position of the 1-2-3-4 clutch regulator valve. When the 1-2-3-4 clutch is commanded OFF, pressure is present on the Transmission Fluid Pressure Switch 4. When the 1-2-3-4 clutch is commanded ON, the 1-2-3-4 clutch regulator valve moves and pressure to the Transmission Fluid Pressure Switch is exhausted through the 1-2-3-4 clutch regulator valve.

P0877 or P0878

  1. DTC P0711, P0712, P0713, P0716, P0717, P0722, P0723, P0751, P0742, P0756, P0757, P0973, P0974, P0976, P0977, P1915, or P182E is not set.
  2. Ignition voltage is between 8.6-32 V.
  3. The transmission fluid temperature is -6.6°C (20.12°F).
  4. Engine speed is between 400-7,500 RPM for 5 s.
  5. The high side driver is commanded ON.
  6. The engine speed is 550 RPM or greater in Drive 1-6 range.

P0877

The Transmission Control Module detects that the Transmission Fluid Pressure Switch 4 signal voltage remains LOW after the 1-2-3-4 clutch transitions from a HIGH pressure state to a LOW pressure state. The Transmission Control Module counts each incident. The DTC sets when 5 counts are accumulated.

P0878

The Transmission Control Module detects that the Transmission Fluid Pressure Switch 4 signal voltage remains HIGH after the 1-2-3-4 clutch transitions from a LOW pressure state to a HIGH pressure state. The Transmission Control Module counts each incident. The DTC sets when 6 counts are accumulated.

  1. DTCs P0877 and P0878 are Type C DTCs.
  2. The Transmission Control Module freezes transmission adaptive functions for the 1-2-3-4 clutch.

DTCs P0877 and P0878 are Type C DTCs.

A Transmission Fluid Pressure Switch may malfunction due to normal debris in the transmission fluid causing a Transmission Fluid Pressure Switch DTC to intermittently set. This type of condition should not be immediately noticeable to a customer, as the switch outputs are used for shift adaptive pressure and do not cause transmission symptoms unless the switch malfunctions continuously for an extended period of time.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  3. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Engine idling in Park with parking brake applied, and drive wheels chocked.
  2. Verify the scan tool parameters listed below display the correct values for each gear range while placing the gear select lever in Park, Reverse, and Neutral position. Refer to «Transmission Fluid Pressure Switch Logic»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__transmission-fluid-pressure-switch-logic) for the correct gear range states. Transmission Fluid Pressure Switch 1 Transmission Fluid Pressure Switch 3 Transmission Fluid Pressure Switch 4 Transmission Fluid Pressure Switch 5 If the correct state is not displayed Refer to Circuit/System Testing. If the correct state is displayed
  3. Place the gear select lever in Drive range.
  4. Verify the scan tool parameters listed below display the correct values for each gear range while commanding the scan tool to Shift Transmission Gear through all forward ranges. Refer to «Transmission Fluid Pressure Switch Logic»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__transmission-fluid-pressure-switch-logic) for the correct gear range states. Transmission Fluid Pressure Switch 1 Transmission Fluid Pressure Switch 3 Transmission Fluid Pressure Switch 4 Transmission Fluid Pressure Switch 5 If the correct state is not displayed Refer to Circuit/System Testing. If the correct state is displayed
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Ignition OFF. Remove the Q8 Control Solenoid Valve Assembly.
  2. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  3. Connect the DT-47825-10 jumper harness between the vehicle wire harness electrical connector, and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  4. Verify the scan tool parameters listed below change states when gently pushing on each Transmission Fluid Pressure Switch with the eraser end of a pencil. Transmission Fluid Pressure Switch 1 Transmission Fluid Pressure Switch 3 Transmission Fluid Pressure Switch 4 Transmission Fluid Pressure Switch 5 If any parameter does not change Replace the Q8 Control Solenoid Valve Assembly. If all parameters change
  5. Verify the channel plate, spacer plate, and filter plate do not have a restricted or blocked orifice. Repair or replace as necessary.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The line pressure control solenoid is part of the control solenoid valve assembly which has no serviceable parts. The normally high line pressure control solenoid regulates and directs the pressure control solenoid oil pressure to the isolator/pressure regulator valve. Increasing pressure control solenoid line pressure increases transmission line pressure. The Transmission Control Module varies the current to the line pressure control solenoid through a low side driver. Decreasing the current to the line pressure control solenoid increases line pressure control solenoid oil pressure by closing OFF the solenoid exhaust port. Increasing the current to the line pressure control solenoid decreases line pressure control oil pressure by opening the solenoid exhaust port. Line pressure control solenoid power is supplied by the Transmission Control Module through a high side driver. The high side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected the high side driver will reset.

P0961, P0962, or P0963

  1. The engine speed is between 400-7,500 RPM for 5 s.
  2. The ignition voltage is between 8.6-32 V.

P0961

The Transmission Control Module detects an internal electrical malfunction of the line pressure control solenoid where the measured line pressure control solenoid current does not equal the commanded line pressure control solenoid current for 5 s.

P0962

The Transmission Control Module detects a short to ground or an open/high resistance on the line pressure control solenoid control circuit for 2 s.

P0963

The Transmission Control Module detects a short to voltage on the line pressure control solenoid control circuit for 5 s.

P0961

  1. DTC P0961 is a Type B DTC.
  2. The TCM freezes transmission adaptive functions.
  3. The TCM commands maximum line pressure.

P0962

  1. DTC P0962 is a Type A DTC.
  2. The TCM turns the high side driver OFF.
  3. The TCM inhibits the torque converter clutch (TCC).
  4. The TCM commands maximum line pressure.
  5. The TCM freezes transmission adaptive functions.
  6. The TCM inhibits powertrain braking.
  7. The ECM/TCM request a reduction in engine torque based on input speed.
  8. The TCM inhibits Tap Up/Down function.
  9. The TCM inhibits manual shifting or forward gears.
  10. The TCM inhibits auto grade braking.
  11. The TCM inhibits neutral idle.

P0963

  1. DTC P0963 is a Type B DTC.
  2. The TCM freezes transmission adaptive functions.
  3. The TCM commands maximum line pressure.
  1. DTCs P0961 and P0963 are Type B DTCs.
  2. DTC P0962 is a Type A DTC.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  2. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  3. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Engine running in Park position, parking brake applied, place the gear select lever in each gear position for 2-3 s. Return the gear select lever to the Park position.
  2. Verify the scan tool parameters listed below do not display Malfunction: Line Pressure Control Solenoid Valve Performance Test Status Line Pressure Control Solenoid Valve Control Circuit High Voltage Test Status Line Pressure Control Solenoid Valve Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  5. All OK.
  1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
  2. Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If contaminated Clean as necessary. If not contaminated
  3. Verify the resistance is within the specified range for each solenoid. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If resistance is not within range Replace the Q8 Control Solenoid Valve Assembly. If resistance is within range
  4. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  5. Connect DT-47825-10 jumper harness between the vehicle wire harness electrical connector and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  6. Verify the scan tool the parameters listed below do not display Malfunction: Line Pressure Control Solenoid Valve Performance Test Status Line Pressure Control Solenoid Valve Control Circuit High Voltage Test Status Line Pressure Control Solenoid Valve Control Circuit Low Voltage Test Status If Malfunction is displayed Replace the Q8 Control Solenoid Valve Assembly. If Malfunction is not displayed
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The pressure control solenoid 2 is part of the control solenoid valve assembly which has no serviceable parts. The normally high pressure control solenoid 2 regulates and directs the pressure control solenoid 2 oil pressure to the 3-5 reverse clutch regulator valve and 3-5 reverse clutch boost valve. Increasing pressure control solenoid 2 pressure increases pressure to the 3-5 reverse clutch. The Transmission Control Module varies the current to the pressure control solenoid 2 through a low side driver. Decreasing the current to the pressure control solenoid 2 increases pressure control solenoid 2 oil pressure by closing OFF the solenoid exhaust port. Increasing the current to the pressure control solenoid 2 decreases pressure control solenoid 2 oil pressure by opening the solenoid exhaust port. Pressure control solenoid 2 power is supplied by the Transmission Control Module through a high side driver. The high side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected, the high side driver will reset.

  1. The ignition voltage is between 8.6-32 V.
  2. The engine speed is between 400-7,500 RPM for 5 s.

P0965

The Transmission Control Module detects an internal electrical performance malfunction of the clutch pressure control solenoid 2 control circuit where the measured clutch pressure control solenoid 2 current does not equal the commanded clutch pressure control solenoid 2 current for 5 s.

P0966

The Transmission Control Module detects a short to ground on the clutch pressure control solenoid 2 control circuit for 1 s.

P0967

The Transmission Control Module detects an open or short to voltage on the clutch pressure control solenoid 2 control circuit, for 1 s.

P0965

  1. DTC P0965 is a Type C DTC.
  2. The TCM freezes transmission adaptive functions on the 3-5 Reverse clutch.

P0966

  1. DTC P0966 is a Type A DTC.
  2. The TCM turns OFF the high side driver.
  3. The TCM forces TCC OFF.
  4. The TCM freezes transmission adaptive functions.
  5. The TCM commands maximum line pressure.
  6. The TCM enables Torque management.
  7. The TCM inhibits TAP Up/Down function.
  8. The TCM inhibits manual shifting of forward gears.
  9. The TCM limits the transmission to Reverse and 3rd or 5th gear operation.

P0967

  1. DTC P0967 is a Type A DTC.
  2. The TCM limits the transmission to 3rd gear or reverse gear operation.
  3. The TCM forces TCC OFF.
  4. The TCM freezes transmission adaptive functions.
  5. The TCM commands maximum line pressure.
  6. The TCM enables Torque management.
  7. The TCM inhibits TAP Up/Down function.
  8. The TCM inhibits manual shifting of forward gears.
  1. DTC P0965 is a Type C DTC.
  2. DTCs P0966 and P0967 are Type A DTCs.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  2. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  3. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Operate the vehicle in drive range. Allow the vehicle to shift through all forward gear ranges.
  2. Verify the scan tool parameters listed below do not display Malfunction Pressure Control Solenoid Valve 2 Performance Test Status Pressure Control Solenoid Valve 2 Control Circuit High Voltage Test Status Pressure Control Solenoid Valve 2 Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  5. All OK.
  1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
  2. Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If contaminated Clean as necessary If not contaminated
  3. Verify the resistance is within the specified range for each solenoid. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If resistance is not within range Replace the Q8 Control Solenoid Valve Assembly. If resistance is within range
  4. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  5. Connect DT-47825-10 jumper harness between the vehicle wire harness electrical connector and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  6. Verify the scan tool parameters listed below do not display Malfunction: Pressure Control Solenoid Valve 2 Performance Test Status Pressure Control Solenoid Valve 2 Control Circuit High Voltage Test Status Pressure Control Solenoid Valve 2 Control Circuit Low Voltage Test Status If Malfunction is displayed Replace the Q8 Control Solenoid Valve Assembly. If Malfunction is not displayed
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The pressure control solenoid 3 is part of the control solenoid valve assembly which has no serviceable parts. The normally high pressure control solenoid 3 regulates and directs the pressure control solenoid 3 oil pressure to the 4-5-6 clutch regulator valve and 4-5-6 clutch boost valve. Increasing pressure control solenoid 3 oil pressure increases oil pressure to the 4-5-6 clutch assembly. The Transmission Control Module varies the current to the pressure control solenoid 3 through a low side driver. Decreasing the current to the pressure control solenoid 3 increases pressure control solenoid 3 oil pressure by closing OFF the solenoid exhaust port. Increasing the current to the pressure control solenoid 3 decreases pressure control solenoid 3 oil pressure by opening the solenoid exhaust port. Pressure control solenoid 3 power is supplied by the Transmission Control Module through a high side driver. The high side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected the high side driver will reset.

  1. The ignition voltage is between 8.6-32 V.
  2. The engine speed is between 400-7,500 RPM for 5 s.

P0969

The Transmission Control Module detects an internal electrical malfunction on the pressure control solenoid 3 control circuit where the measured pressure control solenoid 3 current does not equal the commanded clutch pressure control solenoid 3 current for 5 s.

P0970

The Transmission Control Module detects a short to ground on the pressure control solenoid 3 control circuit for 1 s.

P0971

The Transmission Control Module detects an open or short to voltage on the pressure control solenoid 3 control circuit for 1 s.

P0969

  1. DTC P0969 is a Type C DTCs.
  2. The TCM freezes transmission adaptive functions to the low and reverse clutch and 4-5-6 clutch.

P0970 and P0971

  1. DTC P0970 and P0971 are Type A DTCs.
  2. The TCM limits the transmission to Reverse and 3rd or 5th gear operation.
  3. The TCM turns the high side driver OFF.
  4. The TCM forces TCC OFF.
  5. The TCM freezes transmission adaptive functions.
  6. The TCM commands maximum line pressure.
  7. The TCM enables Torque management.
  8. The TCM inhibits TAP Up/Down function.
  9. The TCM inhibits manual shifting of forward gears.
  1. DTC P0969 is a Type C DTCs.
  2. DTCs P0970 and P0971 are Type A DTCs.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  2. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  3. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Operate the vehicle in drive range. Allow the vehicle to shift through all forward gear ranges.
  2. Verify the scan tool parameters listed below do not display Malfunction: Pressure Control Solenoid Valve 3 Performance Test Status Pressure Control Solenoid Valve 3 Control Circuit High Voltage Test Status Pressure Control Solenoid Valve 3 Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  5. All OK.
  1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
  2. Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If contaminated Clean as necessary If not contaminated
  3. Verify the resistance is within the specified range for each solenoid. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If resistance is not within range Replace the Q8 Control Solenoid Valve Assembly. If resistance is within range
  4. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  5. Connect DT-47825-10 jumper harness between the vehicle wire harness electrical connector and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  6. Verify the scan tool parameters do not display Malfunction: Pressure Control Solenoid Valve 3 Performance Test Status Pressure Control Solenoid Valve 3 Control Circuit High Voltage Test Status Pressure Control Solenoid Valve 3 Control Circuit Low Voltage Test Status If Malfunction is displayed Replace the Q8 Control Solenoid Valve Assembly. If Malfunction is not displayed
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The shift solenoid 1 is part of the control solenoid valve assembly which has no serviceable parts. The shift solenoid 1 is a normally closed ON/OFF solenoid and is controlled by the Transmission Control Module through a low side driver. When the shift solenoid 1 is energized, shift solenoid 1 fluid pressure is directed to the clutch select valve 2. Power to the shift solenoid 1 is supplied by the Transmission Control Module through a high side driver. The high side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected, the high side driver will reset.

P0973 or P0974

  1. DTCs P0973 or P0974 is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.

P0973

The control solenoid valve assembly detects an internal low voltage electrical malfunction of the shift solenoid 1 control circuit when the shift solenoid 1 is commanded OFF for 2 seconds.

P0974

The control solenoid valve assembly detects an internal high voltage electrical malfunction of the shift solenoid 1 control circuit when the shift solenoid 1 is commanded ON for 2 seconds.

P0973

  1. DTC P0973 is a Type A DTC.
  2. The TCM forces the torque converter clutch (TCC) OFF.
  3. The TCM commands maximum line pressure.
  4. The TCM freezes transmission adaptive functions.
  5. The TCM enables Torque Management.
  6. The TCM inhibits TAP function.
  7. The TCM inhibits manual shifting of forward gears.
  8. The TCM inhibits Tow/Haul mode.
  9. The TCM inhibits neutral idle.
  10. The TCM commands neutral gear if the output speed sensor signal is 1350 RPM or greater.
  11. The TCM commands 2nd gear if the output speed sensor signal is less than 1350 RPM. No upshift allowed.

P0974

  1. DTC P0974 is a Type B DTC.
  2. The TCM inhibits 1st gear.
  3. The TCM inhibits neutral idle.
  1. DTC P0973 is a Type A DTC.
  2. DTC P0974 is a Type B DTC.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  2. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  3. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Engine Running, place the gear selector in Reverse for 5 seconds and then idle the vehicle in Park for 5 seconds.
  2. Verify the scan tool parameters listed below do not display Malfunction: Shift Solenoid Valve 1 Control Circuit High Voltage Test Status Shift Solenoid Valve 1 Control Circuit Open Test Status Shift Solenoid Valve 1 Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  5. All OK.
  1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
  2. Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If contaminated Clean as necessary. If not contaminated
  3. Verify the resistance is within the specified range for each solenoid. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If resistance is not within range Replace the Q8 Control Solenoid Valve Assembly. If resistance is within range
  4. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  5. Connect DT-47825-10 jumper harness between the vehicle wire harness electrical connector, and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  6. Verify the scan tool parameters listed below do not display Malfunction: Shift Solenoid Valve 1 Control Circuit High Voltage Test Status Shift Solenoid Valve 1 Control Circuit Open Test Status Shift Solenoid Valve 1 Control Circuit Low Voltage Test Status If Malfunction is displayed Replace the Q8 Control Solenoid Valve Assembly. If Malfunction is not displayed
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. Before replacing the TCM, perform the «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) .
  3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The shift solenoid 2 is part of the control solenoid valve assembly which has no serviceable parts. The shift solenoid 2 is a normally closed ON/OFF solenoid and is controlled by the Transmission Control Module through a low side driver. When the shift solenoid 2 is energized, shift solenoid 2 fluid pressure is directed to the clutch select valve 3. Power to the shift solenoid 2 is supplied by the Transmission Control Module through a high side driver. The high side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected, the high side driver will reset.

P0976 or P0977

  1. DTCs P0976 or P0977 is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.

P0976

The Transmission Control Module detects an internal low voltage electrical malfunction of the shift solenoid 2 control circuit when the shift solenoid 2 is commanded OFF for 2 seconds.

P0977

The Transmission Control Module detects an internal high voltage electrical malfunction of the shift solenoid 2 control circuit when the shift solenoid 2 is commanded ON for 2 seconds.

P0976

  1. DTC P0976 is a Type C DTC.
  2. The TCM freezes transmission adaptive functions.

P0977

  1. DTC P0977 is a Type A DTC.
  2. The TCM freezes transmission adaptive functions.
  3. The TCM inhibits TAP Up/Down function.
  4. The TCM inhibits manual shifting of forward gears.
  5. The TCM commands maximum line pressure.
  6. The TCM inhibits powertrain braking.
  7. The TCM inhibits neutral idle.
  8. The TCM inhibits auto grade braking.
  9. The TCM inhibits Tow/Haul function.
  10. The TCM commands neutral gear if the output speed sensor signal is 1,350 RPM or greater.
  11. The TCM commands 2nd gear if the output speed sensor signal is less than 1,350 RPM. No upshift allowed.
  1. DTC P0976 is a Type C DTC.
  2. DTC P0977 is a Type A DTC.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  2. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  3. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Engine Running, place the gear selector in Reverse for 5 seconds and then idle the vehicle in Park for 5 seconds.
  2. Verify the scan tool parameters listed below do not display Malfunction: Shift Solenoid Valve 2 Control Circuit High Voltage Test Status Shift Solenoid Valve 2 Control Circuit Open Test Status Shift Solenoid Valve 2 Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  5. All OK.
  1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
  2. Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If contaminated Clean as necessary. If not contaminated
  3. Verify the resistance is within the specified range for each solenoid. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If resistance is not within range Replace the Q8 Control Solenoid Valve Assembly. If resistance is within range
  4. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  5. Connect DT-47825-10 jumper harness between the vehicle wire harness electrical connector, and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  6. Verify the scan tool parameters listed below do not display Malfunction: Shift Solenoid Valve 2 Control Circuit High Voltage Test Status Shift Solenoid Valve 2 Control Circuit Open Test Status Shift Solenoid Valve 2 Control Circuit Low Voltage Test Status If Malfunction is displayed Replace the Q8 Control Solenoid Valve Assembly. If Malfunction is not displayed
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. Before replacing the TCM, perform the «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) .
  3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Transmission Fluid Pressure Switch 5 is part of the control solenoid valve assembly which has no serviceable parts. The Transmission Control Module supplies a signal circuit to the Transmission Fluid Pressure Switch 5. The Transmission Fluid Pressure Switch 5 has an internal case ground. Transmission Fluid Pressure Switch 5 is normally closed or LOW. When oil pressure is present at the Transmission Fluid Pressure Switch 5, the switch is open or HIGH. The normally high pressure control solenoid 3 controls pressure to the CBR1/4-5-6 clutch regular valve. The Transmission Control Module monitors the Transmission Fluid Pressure Switch 5 signal circuit to determine the position of the CBR1/4-5-6 clutch regulator valve. When the 4-5-6 clutch is commanded OFF, pressure is present on the Transmission Fluid Pressure Switch 5. When the 4-5-6 clutch is commanded ON, the CBR1/4-5-6 clutch regulator valve moves and pressure to the Transmission Fluid Pressure Switch 5 is exhausted through the CBR1/4-5-6 clutch regulator valve.

P0989 or P0990

  1. DTC P0711, P0712, P0713, P0716, P0717, P0722, P0723, P0751, P0742, P0756, P0757, P0973, P0974, P0976, P0977, P1915, or P182E is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The transmission fluid is -6.6°C (20.12°F) or greater.
  4. The engine speed is between 400-7,500 RPM for 5 s.
  5. The high side driver is commanded ON.
  6. The engine speed is 550 RPM or greater in Drive 1-6 range.

P0989

The Transmission Control Module detects that the Transmission Fluid Pressure Switch 5 signal voltage remains LOW after the 4-5-6 clutch transitions from a HIGH pressure state to a LOW pressure state. The Transmission Control Module counts each incident. The DTC sets when 18 counts are accumulated.

P0990

The Transmission Control Module detects that the Transmission Fluid Pressure Switch 5 signal voltage remains HIGH after the 4-5-6 clutch transitions from a LOW pressure state to a HIGH pressure state. The Transmission Control Module counts each incident. The DTC sets when 15 counts are accumulated.

  1. DTCs P0989 and P0990 are Type C DTCs.
  2. The Transmission Control Module freezes transmission adaptive functions for the 4-5-6 clutch.

DTCs P0989 and P0990 are Type C DTCs.

A Transmission Fluid Pressure Switch may malfunction due to normal debris in the transmission fluid causing a Transmission Fluid Pressure Switch DTC to intermittently set. This type of condition should not be immediately noticeable to a customer, as the switch outputs are used for shift adaptive pressure and do not cause transmission symptoms unless the switch malfunctions continuously for an extended period of time.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  3. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Engine idling in Park with parking brake applied, and drive wheels chocked.
  2. Verify the scan tool parameters listed below display the correct values for each gear range while placing the gear select lever in Park, Reverse, and Neutral position. Refer to «Transmission Fluid Pressure Switch Logic»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__transmission-fluid-pressure-switch-logic) for the correct gear range states. Transmission Fluid Pressure Switch 1 Transmission Fluid Pressure Switch 3 Transmission Fluid Pressure Switch 4 Transmission Fluid Pressure Switch 5 If the correct state is not displayed Refer to Circuit/System Testing. If the correct state is displayed
  3. Place the gear select lever in Drive range.
  4. Verify the scan tool parameters listed below display the correct values for each gear range while commanding the scan tool to Shift Transmission Gear through all forward ranges. Refer to «Transmission Fluid Pressure Switch Logic»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__transmission-fluid-pressure-switch-logic) for the correct gear range states. Transmission Fluid Pressure Switch 1 Transmission Fluid Pressure Switch 3 Transmission Fluid Pressure Switch 4 Transmission Fluid Pressure Switch 5 If the correct state is not displayed Refer to Circuit/System Testing. If the correct state is displayed
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Ignition OFF. Remove the Q8 Control Solenoid Valve Assembly.
  2. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  3. Connect the DT-47825-10 jumper harness between the vehicle wire harness electrical connector and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  4. Verify the scan tool parameters listed below change states when gently pushing on each Transmission Fluid Pressure Switch with the eraser end of a pencil. Transmission Fluid Pressure Switch 1 Transmission Fluid Pressure Switch 3 Transmission Fluid Pressure Switch 4 Transmission Fluid Pressure Switch 5 If any parameter does not change Replace the Q8 Control Solenoid Valve Assembly. If all parameters change
  5. Verify the channel plate, spacer plate, and filter plate do not have a restricted or blocked orifice. Repair or replace as necessary.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The driver shift request, also known as the TAP Up/Downshift manual shift function, allows the driver to select the desired range of gears for current driving conditions. The driver shift request shift system is activated when the gear selector is in the manual position. The driver shift request system is deactivated in all other range positions. When driver shift request is selected, a signal is sent to the Body Control Module and the also to the Transmission Control Module. Each time a signal is sent, an internal counter in the Body Control Module and Transmission Control Module increments. Both counters must have the same value. This code sets when the rolling count value of the Transmission Control Module does not match the same rolling count value sent from the Body Control Module.

The engine run time is greater than 5 s.

The TCM detects an error in the rolling count value that does not match with the BCM.

  1. DTC P1761 is a Type C DTC.
  2. The TCM disables TAP Shift operation.

DTC P1761 is a Type C DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Description and Operation

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Verify there are no other K9 Body Control Module or communication DTCs set. If a DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If a DTC is not set
  2. Complete the diagnosis by looking for a CAN fault. Refer to «Scan Tool Does Not Communicate with High Speed GMLAN Device»(/cadillac/ats/i-2012-2014/remont/communication-devices/#data-communication-system) . If a CAN circuit fault is found Repair as necessary. If a CAN circuit fault is not found
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Normal Range = None
Tap Up/Tap Down Switch Signal 2 Circuit0 V0 V5-12 V

Driver Shift Request

The drivers shift control (DSC) also known as the Tap UP/Down feature allows the driver to shift or change gears similar to a manual transmission. Activating the DSC is accomplished by placing the shift lever in the manual (M) mode position. To place the shift lever in M position, move the shift lever to the right from the drive (D) position gate. When the shift lever is in the M position an upshift is accomplished pushing the shift lever forward. A downshift is accomplished by pulling back or pushing rearward on the shift lever. A redundant set of Tap UP/Down switches are available on the steering wheel horizontal crossbar facing the instrument panel. The plus (+) switch is located on the right side of the steering wheel and the minus (-) switch is located on the left side of the steering wheel. A 12 volt parallel circuit from the body control module (BCM) supplies voltage to the automatic transmission manual shift switch on the shift lever and to the automatic transmission manual shift switches on the steering wheel. A separate signal circuit from each switch to the BCM provides the information on each Tap Up/Down command. The BCM sends the requested command on the serial data line to the transmission control module (TCM) to perform the shift.

P1765, P1766, or P1767

  1. DTCs P1761, P1765, P1766, P1767, P182E, and P1915 are not set.
  2. Ignition voltage is greater than 8.6 volts.
  3. The engine speed is greater than 500 RPM for 5 seconds.

P1765

The TCM detects a Stuck ON tap up switch for 1 second in PARK, NEUTRAL, and in manual position for 600 seconds, when the tap down switch is depressed.

P1766

The TCM detects a Stuck ON tap down switch for 1 second in PARK, NEUTRAL, and in manual position for 600 seconds when the tap up switch is depressed.

P1767

The TCM detects an invalid voltage on the TAP Up/Down Signal Circuit for 1 minute.

  1. DTCs P1765, P1766, and P1767 are Type C DTCs.
  2. The TCM disables TAP shift functions.

DTCs P1765, P1766, and P1767 are Type C DTCs.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Engine running, park brake applied, drive wheels chocked. Shift the transmission into the manual (M) position. Verify with a scan tool the following TCM parameters display the correct values: Drivers Shift Control - Inactive Drivers Shift Request - None If the TCM parameters are incorrect Refer to Circuit/System Testing below. If the TCM parameters are correct
  2. Verify with a scan tool the following TCM parameters display the correct values when pressing the automatic transmission manual shift switch-right: Drivers Shift Control - Active Drivers Shift Request - Upshift If the TCM parameters are incorrect Refer to Circuit/System Testing below. If the TCM parameters are correct
  3. Verify with a scan tool the following TCM parameters display the correct values when pressing the automatic transmission manual shift switch-left: Drivers Shift Control - Active Drivers Shift Request - Downshift If the TCM parameters are incorrect Refer to Circuit/System Testing below. If the TCM parameters are correct
  4. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .
  1. Ignition OFF, disconnect the automatic transmission manual shift switch left and right wire harness connector.
  2. Ignition ON, test for 11-13 volts on terminal 2 on both the automatic transmission manual shift switch left and right harness connectors and ground. If not within the specified value Test the voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. If within the specified value
  3. Ignition OFF, test for infinite resistance between terminal 1 and terminal 2 on the automatic transmission manual shift switch-right, with the switch open. If not within the specified value Replace the automatic transmission manual shift switch-right If within the specified value
  4. Ignition OFF, test for 1.20-1.50 k ohms between terminal 1 and terminal 2 on the automatic transmission manual shift switch-right, with the switch closed. If not within the specified value Replace the automatic transmission manual shift switch-right. If within the specified value
  5. Ignition OFF, test for infinite resistance between terminal 1 and terminal 2 on the automatic transmission manual shift switch-left, with the switch open. If not within the specified value Replace the automatic transmission manual shift switch-right. If within the specified value
  6. Ignition OFF, test for 1.50-1.80 k ohms between terminal 1 and terminal 2 on the automatic transmission manual shift switch-left, with the switch closed. If not within the specified value Replace the automatic transmission manual shift switch-left. If within the specified value
  7. Ignition OFF, connect a 3A fused jumper wire between terminal 1 and terminal 2 on the automatic transmission manual shift switch-left harness connector.
  8. Ignition ON, test for 11-13 volts on the BCM connector X1 terminal 7 and ground. If not within the specified range Test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Refer to «Manual Shift Auxiliary Position Switch Replacement - Steering Wheel»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  2. Refer to «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for body control module replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Signal AP182EP1915P1915P182E, P1915
Signal BP1915P182EP182EP182E, P1915
Signal CP1915P182EP182EP182E, P1915
Signal PP182EP1915P1915P182E, P1915
GroundP182EP182EP182E, P1915
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Ignition ON, range selector in Park
Signal ALOWHighHigh
Signal BLOWHighHigh
Signal CLOWHighHigh
Signal PLOWHighHigh

IMS A/B/C/P

The manual shift detent lever with shaft position switch assembly or internal mode switch assembly is a sliding contact switch attached to the control valve body within the transmission. The 4 inputs to the Transmission Control Module from the switch indicate which position is selected by the transmission manual shaft. The input voltage at the Transmission Control Module is high when the switch is open and low when the switch is closed to ground. The state of each input is displayed on the scan tool. The input parameters represented are transmission range signal A, Signal B, signal C, and signal P.

The park/neutral position switch is integrated into the transmission internal mode switch. The circuit uses the Transmission Control Module as a pass-through connection only.

The park/neutral signal is sent from the park/neutral switch directly to the engine control module and is used only for engine start enable.

P182E

  1. DTCs: P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, P07C0, P07BF, P077C or P077D is not set.
  2. The engine speed is between 400-7,500 RPM.
  3. The ignition voltage is between 8.6-32 V.
  4. Engine torque signal is valid.

P1915

  1. DTC P0722 or P0723 is not set.
  2. The transmission output shaft speed is less than 90 RPM.
  3. The ignition voltage is between 8.6-32 V.

P182E

The IMS does not indicate a valid Park, Reverse, Neutral or Drive Range gear position for 7 seconds.

P1915

The manual shift shaft IMS switch assembly does not indicate Park or Neutral during the following sequence

  1. The engine speed is less than 50 RPM for more than 0.15 seconds.
  2. The engine speed is 50-480 RPM for more than 0.07 seconds.
  3. The engine speed is greater than 525 RPM for more than 3.25 seconds.
  4. The transmission input shaft speed is 200 RPM or greater.
  1. DTCs P182E and P1915 are Type A DTCs.
  2. The TCM commands maximum line pressure.
  3. The TCM turns off all solenoids - HSD1 and HSD2.
  4. The TCM freezes transmission adaptive functions.
  5. The TCM defaults the transmission to third gear if the current gear is 1st, 2nd, or 3rd; or fifth gear if the current gear is 4th, 5th, or 6th gear.
  6. The TCM inhibits TCC.
  7. The TCM inhibits Tap up and Tap down functions.

DTCs P182E and P1915 are Type A DTCs.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  3. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Verify DTC P0850, P0851 or P0852 is set. If any of the DTCs are set Refer to «DTC P0850-P0852»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures) . If none of the DTCs are set
  2. Verify the range selector cable is adjusted correctly. Refer to «Range Selector Lever Cable Adjustment»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle__range-selector-lever-cable-adjustment) . If the cable adjustment is not OK Adjust, repair or replace as necessary. If the cable adjustment is OK
  3. Ignition ON.
  4. Verify the scan tool parameter matches the Transmission Internal Mode Switch Logic table for each gear position. Refer to «Transmission Internal Mode Switch Logic»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__transmission-internal-mode-switch-logic) . If the parameter does not match Refer to Circuit/System Testing. If the parameter matches
  5. Verify the scan tool engine control module Park/Neutral Switch parameter displays Park/Neutral with the gear shift lever in Park or Neutral and In Gear when in Reverse or Drive. If Park/Neutral or In Gear is not displayed Refer to Circuit/System Testing. If Park/Neutral or In Gear is displayed
  6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  7. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  8. All OK.

Note. You must perform Circuit/System Verification first.

  1. Ignition OFF, remove the automatic transmission fluid pan. Refer to «Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  2. Disconnect the B15 Transmission Internal Mode Switch connector at the Q8 Control Solenoid Valve Assembly. Ignition ON.
  3. Verify the scan tool transmission control module Internal Mode Switch A/B/C/P parameter displays High High High High. If High High High High is not displayed Replace the Q8 Control solenoid Valve Assembly. If High High High High is displayed
  4. Verify the scan tool Engine Control Module Park/Neutral Position Switch parameter displays In Gear. If In Gear is not displayed Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the neutral start signal circuit and ground at the vehicle harness K20 Engine Control Module connector. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If In Gear is displayed
  5. Install a 3 A fused jumper wire between the low reference circuit terminal A and each signal circuit listed below one at a time at the Q8 Control Solenoid Valve Assembly: Signal A - terminal E Signal B - terminal D Signal C - terminal C Signal P - terminal B
  6. Verify the scan tool Transmission Control Module A/B/C/P displays 1 Low and 3 High when a signal circuit is grounded. If 1 Low and 3 High is not displayed Replace the Q8 control solenoid valve assembly. If 1 Low and 3 High is displayed
  7. Connect a 3 A fused jumper wire between Park/Neutral switch signal circuit terminal F and low reference circuit terminal A at the Q8 Control Solenoid Valve Assembly.
  8. Verify the scan tool engine control module Park/Neutral Position Switch parameter displays Park/Neutral. If Park/Neutral is not displayed Ignition OFF, disconnect the connector at the K20 Engine Control Module. Test for less than 2 ohms in the signal circuit wire end to wire end. If 2 ohms or greater, repair the open/high resistance in the wire circuit. If less than 2 ohms, replace the K20 Engine Control Module. If Park/Neutral is displayed
  9. Replace the B15 Transmission Internal Mode Switch.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. Perform the «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) before replacing any internal transmission components.
  3. «Manual Shift Shaft Position Switch Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) for internal mode switch (IMS) replacement.
  4. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

To improve transmission shift feel, the transmission control module (TCM) is constantly sending the engine control module (ECM) serial data messages with information regarding its request for modifying engine torque. The ECM sets this code when it detects a discrepancy in the structure of this message causing its integrity to be questioned.

An intermittent fault in the controller area network (CAN) circuits will cause DTC P2544 to set.

  1. The engine run time is greater than 5 s.
  2. No other CAN errors are present.

An intermittent fault in the CAN circuits.

  1. DTC P2544 is a Type B DTC.
  2. The TCM commands maximum line pressure during shifts, which results in very harsh shifts.

DTC P2544 is a Type B DTC.

DTC Type Reference

  1. DTC P2544 is an informational DTC. Diagnose all other ECM and TCM DTCs prior to DTC P2544. For other DTCs that are set. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. If there are no other ECM and TCM DTCs, diagnosis is accomplished by looking for an intermittent CAN circuit fault. Refer to «Scan Tool Does Not Communicate with High Speed GMLAN Device»(/cadillac/ats/i-2012-2014/remont/communication-devices/#data-communication-system) .
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Note. The DTCs listed below set due to a transmission hydraulic/mechanical condition. Perform the Circuit/System Verification and Circuit/System Testing to identify the cause.

The clutch pressure control solenoid 4 is part of the control solenoid valve assembly, which has no serviceable parts. The Clutch Pressure Control Solenoid 4 regulates transmission fluid pressure to the 2-6 clutch regulator valve which controls pressure to the 2-6 clutch. The Transmission Control Module calculates gear ratio based on the RPM signals from the input speed sensor (ISS) and the output speed sensor (OSS). The Transmission Control Module compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear.

P2714

  1. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.
  4. The transmission temperature is -6.6°C (20.12°F) or greater.
  5. The throttle position signal is valid.
  6. High side driver is enabled.
  7. The transmission output speed sensor signal is 67 RPM or greater or the accelerator pedal position sensor signal is 0.5 percent or greater.

P2715

  1. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.
  4. The transmission temperature is -6.6°C (20.12°F) or greater.
  5. The throttle position signal is valid.
  6. High side driver is enabled.
  7. The transmission output speed sensor signal is 67 RPM or greater or the accelerator pedal position sensor signal is 0.5 percent or greater.

P2714

The Transmission Control Module has detected an incorrect gear ratio or neutral condition when the 2-6 clutch is commanded ON. This condition must occur 3 times.

P2715

The Transmission Control Module has detected an incorrect gear ratio change when the 2-6 clutch is commanded OFF during a shift or when 2nd gear ratio is detected in 1st gear. This condition must occur 3 times.

P2714

  1. DTC P2714 is a Type A DTC.
  2. The TCM commands maximum line pressure.
  3. The TCM inhibits Tow/Haul mode.
  4. The TCM freezes transmission adaptive functions.
  5. The TCM inhibits TAP Up/Down function.
  6. The TCM inhibits Manual Up/Down Shift with the shift selector.
  7. The TCM inhibits powertrain braking.
  8. The TCM inhibits neutral idle.
  9. The TCM inhibits Tow/Haul mode.
  10. The TCM limits the transmission to Reverse gear and 3rd gear operation.

P2715

  1. DTC P2715 is a Type A DTC.
  2. The TCM commands maximum line pressure.
  3. The TCM inhibits Tow/Haul mode.
  4. The TCM freezes transmission adaptive functions.
  5. The TCM inhibits TAP Up/Down function.
  6. The TCM inhibits Manual Up/Down Shift with the shift selector.
  7. The TCM inhibits powertrain braking.
  8. The TCM inhibits neutral idle.
  9. The TCM inhibits Tow/Haul mode.
  10. The TCM limits the transmission to neutral gear if the output speed sensor signal is 1,350 RPM or greater.
  11. The TCM limits the transmission to 2nd gear if the output speed sensor signal is less than 1,350 RPM. No upshift will occur.

DTCs P2714 and P2715 are Type A DTCs.

Before performing a road test, configure and setup the scan tool for snapshot mode. This will allow you to display, monitor, and verify multiple transmission data parameters at one time, after the road test.

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  3. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  4. «Park - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__park-engine-running)
  5. «Reverse»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__reverse)
  6. «Neutral - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__neutral-engine-running)
  7. «Drive Range, First Gear Engine Braking»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear-engine-braking)
  8. «Drive Range, First Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear)
  9. «Drive Range, Second Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-second-gear)
  10. «Drive Range, Third Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear)
  11. «Drive Range, Third Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear-default)
  12. «Drive Range - Fourth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fourth-gear)
  13. «Drive Range, Fifth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear)
  14. «Drive Range, Fifth Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear-default)
  15. «Drive Range, Sixth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-sixth-gear)
  16. «Fluid Passages»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. DT-47825 Control Solenoid Test Plate
  2. DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Engine idling in Park position, with parking brake applied and drive wheels chocked.
  2. Verify the transmission fluid level and condition is correct. Refer to «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) . If the transmission fluid level and condition is not correct Repair as necessary. If the transmission fluid level and condition is correct
  3. Ignition ON, clear the TCM DTCs.
  4. Verify the transmission operation performs as indicated in the road test instructions and DTCs P2714 or P2715 did not set. Refer to «Road Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__road-test) . If DTCs P2714 or P2715 are set Refer to Circuit/System Testing. If DTCs P2714 or P2715 did not set
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Verify the transmission line pressures are within the specified ranges. Refer to «Line Pressure Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures) . If pressures are not within range Refer to «Fluid Pressure High or Low»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__fluid-pressure-high-or-low) . If pressures are within range
  2. Ignition OFF. Remove the Q8 Control Solenoid Valve Assembly.
  3. Verify a pressure change occurs for all solenoids when performing the solenoid test. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If a pressure change does not occur Replace the Q8 Control Solenoid Valve Assembly. If a pressure change does occur
  4. Verify the conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.

P2714 or P2715 - Control Valve Upper Body Assembly (304)

2-6 clutch regulator valve (334) stuck/sticky - debris, binding, damaged valve, or scored bore.

P2714 - Q8 Control Solenoid Valve Assembly (314)

Refer to document PIP 4304A. DTC P2714 may be set with DTC P0878.

P2714 or P2715 - Q8 Control Solenoid Valve Assembly (314)

  1. Control signal fluid supply leak-valve body filer plate assembly cracked or damage gasket seal.
  2. O-ring seals leaking.

P2714 or P2715 - Center (w/2-6 and Low/Rev Clutch) Support Assembly (67)

  1. 2-6 clutch return spring retaining ring (455) not seated in groove.
  2. 2-6 clutch piston assembly - seal damaged or leaking.
  3. 2-6 clutch plates (451-453) worn or damaged.
  4. Center support transfer seal assembly (20) incorrectly installed.

P2714 - 1-2-3-4 and 3-5-R Clutch Housing Assembly (51)

  1. 1-2-3-4 clutch backing plate retaining ring (429) not seated/oriented correctly.
  2. 1-2-3-4 clutch piston (414) - seals damaged or leaking.
  3. 1-2-3-4 clutch piston (414) - cracked or damaged.

P2714 - 4-5-6 (w/turbine shaft) Clutch Assembly (56)

  1. Turbine shaft fluid seal rings (442) damaged or leaking.
  2. 4-5-6 clutch piston assembly (439) - seals damaged or leaking.

P2714 - A/Trans Fluid Pump Cover Assembly (219)

Pump tower seals (230) damaged or leaking.

P2714 - Torque Converter (w/fluid pump) Housing Assembly (2)

Fluid pump housing/vanes/rotor/slide damaged/scored.

P2714 - A/Trans Fluid Filter Assembly (26)

Oil filter (26) or filter seal (25) loose or damaged.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The pressure control solenoid 4 is part of the control solenoid valve assembly which has no serviceable parts. The normally low pressure control solenoid 4 regulates and directs oil pressure to the 2-6 clutch regulator valve. Increasing pressure control solenoid 4 pressure increases pressure to the 2-6 clutch regulator valve. The Transmission Control Module varies the current to the pressure control solenoid 4 through a low side driver. Increasing the current to pressure control solenoid 4 increases oil pressure by closing OFF the solenoid exhaust port. Decreasing the current to pressure control solenoid 4 decreases oil pressure by opening the exhaust port. Pressure control solenoid 4 power is supplied by the Transmission Control Module through a high side driver. The high side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected the high side driver will reset.

P2719, P2720, or P2721

  1. DTC P2719, P2720, or P2721 is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.
  4. The clutch PC solenoid 4 is commanded ON.

P2719

The Transmission Control Module detects an internal electrical malfunction on the pressure control solenoid 4 control circuit where the measured pressure control solenoid 4 current does not equal the commanded pressure control solenoid 4 current for 5 s.

P2720

The Transmission Control Module detects a short to ground on the pressure control solenoid 4 control circuit for 1 s.

P2721

The Transmission Control Module detects an open or short to voltage on the pressure control solenoid 4 control circuit for 1 s.

P2719

  1. DTC P2719 is a Type C DTC.
  2. The TCM freezes transmission adaptive functions.

P2720

  1. DTC P2720 is a Type A DTC.
  2. The TCM freezes transmission adaptive functions.
  3. The TCM commands maximum line pressure.
  4. The TCM inhibits TAP Up/Down function.
  5. The TCM inhibits manual shifting of forward gears.
  6. The TCM inhibits engine braking.
  7. The TCM inhibits neutral idle.
  8. The TCM inhibits auto grade braking.
  9. The TCM inhibits Tow/Haul function.
  10. The TCM commands neutral gear when the output speed sensor signal is 1,350 RPM or greater.
  11. The TCM commands second gear when the output speed sensor signal is less than 1,350 RPM.

P2721

  1. DTC P2721 is a Type A DTC.
  2. The TCM freezes transmission adaptive functions.
  3. The TCM commands maximum line pressure.
  4. The TCM inhibits TAP Up/Down function.
  5. The TCM inhibits manual shifting of forward gears.
  6. The TCM inhibits engine braking.
  7. The TCM inhibits neutral idle.
  8. The TCM inhibits auto grade braking.
  9. The TCM inhibits Tow/Haul function.
  10. The TCM commands 3rd gear.
  1. DTC P2719 is a Type C DTC.
  2. DTCs P2720 and P2721 are Type A DTCs.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  2. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  3. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Operate the vehicle in drive range. Allow the vehicle to shift through all forward gear ranges.
  2. Verify the scan tool parameters listed below do not display Malfunction: Pressure Control Solenoid Valve 4 Performance Test Status Pressure Control Solenoid Valve 4 Control Circuit High Voltage Test Status Pressure Control Solenoid Valve 4 Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  5. All OK.
  1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
  2. Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If contaminated Clean as necessary. If not contaminated
  3. Verify the resistance is within the specified range for each solenoid. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If resistance is not within range Replace the Q8 Control Solenoid Valve Assembly. If resistance is within range
  4. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  5. Connect DT-47825-10 jumper harness between the vehicle wire harness electrical connector and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  6. Verify the scan tool parameters do not display Malfunction: Pressure Control Solenoid Valve 4 Performance Test Status Pressure Control Solenoid Valve 4 Control Circuit High Voltage Test Status Pressure Control Solenoid Valve 4 Control Circuit Low Voltage Test Status If Malfunction is displayed Replace the Q8 Control Solenoid Valve Assembly. If Malfunction is not displayed
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Note. The DTCs listed below set due to a transmission hydraulic/mechanical condition. Perform the Circuit/System Verification and Circuit/System Testing to identify the cause.

The clutch pressure control solenoid 5 is part of the control solenoid valve assembly, which has no serviceable parts. The Clutch Pressure Control Solenoid 5 regulates transmission fluid pressure to the 1-2-3-4 clutch regulator valve which controls pressure to the 1-2-3-4 clutch. The Transmission Control Module calculates gear ratio based on the RPM signals from the input speed sensor (ISS) and the output speed sensor (OSS). The Transmission Control Module compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear.

P2723

  1. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.
  4. The transmission temperature is -6.6°C (20.12°F) or greater.
  5. The throttle position signal is valid.
  6. High side driver is enabled.
  7. The transmission output speed sensor signal is 67 RPM or greater or the accelerator pedal position sensor signal is 0.5 percent or greater.

P2724

  1. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.
  4. The transmission temperature is -6.6°C (20.12°F) or greater.
  5. The throttle position signal is valid.
  6. High side driver is enabled.
  7. The transmission output speed sensor signal is 67 RPM or greater or the accelerator pedal position sensor signal is 0.5 percent or greater.

P2723

The Transmission Control Module has detected an incorrect gear ratio or neutral condition when the 1-2-3-4 clutch is commanded ON. This condition must occur 3 times.

P2724

The Transmission Control Module has detected an incorrect gear ratio change when the 1-2-3-4 clutch is commanded OFF during a shift. This condition must occur 3 times.

P2723

  1. DTC P2723 is a Type A DTC.
  2. The TCM commands maximum line pressure.
  3. The TCM inhibits Tow/Haul mode.
  4. The TCM freezes transmission adaptive functions.
  5. The TCM inhibits TAP Up/Down function.
  6. The TCM inhibits Manual Up/Down Shift with the shift selector.
  7. The TCM inhibits powertrain braking.
  8. The ECM/TCM request a reduced amount of engine torque based on transmission input speed.
  9. The TCM inhibits neutral idle.
  10. The TCM inhibits auto grade braking.
  11. The TCM limits the transmission to Reverse gear and 5th gear operation.

P2724

  1. DTC P2724 is a Type A DTC.
  2. The TCM commands maximum line pressure.
  3. The TCM freezes transmission adaptive functions.
  4. The TCM inhibits TAP Up/Down function.
  5. The TCM inhibits Manual Up/Down Shift with the shift selector.
  6. The TCM inhibits powertrain braking.
  7. The TCM inhibits neutral idle.
  8. The TCM inhibits auto grade braking.
  9. The TCM inhibits Tow/Haul function.
  10. The TCM limits the transmission to 4th gear if the output speed sensor signal is 1,400 RPM or greater.
  11. The TCM limits the transmission to 2nd gear if the output speed sensor signal is less than 1,400 RPM. No upshift will occur.

DTCs P2723 and P2724 are Type A DTCs.

Before performing a road test, configure and setup the scan tool for snapshot mode. This will allow you to display, monitor, and verify multiple transmission data parameters at one time, after the road test.

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Description and Operation

  1. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)
  2. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  3. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  4. «Park - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__park-engine-running)
  5. «Reverse»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__reverse)
  6. «Neutral - Engine Running»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__neutral-engine-running)
  7. «Drive Range, First Gear Engine Braking»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear-engine-braking)
  8. «Drive Range, First Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-first-gear)
  9. «Drive Range, Second Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-second-gear)
  10. «Drive Range, Third Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear)
  11. «Drive Range, Third Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-third-gear-default)
  12. «Drive Range - Fourth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fourth-gear)
  13. «Drive Range, Fifth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear)
  14. «Drive Range, Fifth Gear Default»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-fifth-gear-default)
  15. «Drive Range, Sixth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__drive-range-sixth-gear)
  16. «Fluid Passages»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. DT-47825 Control Solenoid Test Plate
  2. DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Engine idling in Park position, with parking brake applied and drive wheels chocked.
  2. Verify the transmission fluid level and condition is correct. Refer to «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) . If the transmission fluid level and condition is not correct Repair as necessary. If the transmission fluid level and condition is correct
  3. Ignition ON, clear the Transmission Control Module DTCs with a scan tool.
  4. Verify the transmission operation performs as indicated in the road test instructions and DTCs P2723 or P2724 did not set. Refer to «Road Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__road-test) . If DTCs P2723 or P2724 are set Refer to Circuit/System Testing. If DTCs P2723 or P2724 did not set
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Verify the transmission line pressures are within the specified ranges. Refer to «Line Pressure Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures) . If pressures are not within range Refer to «Fluid Pressure High or Low»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__fluid-pressure-high-or-low) . If pressures are within range
  2. Ignition OFF. Remove the Q8 Control Solenoid Valve Assembly.
  3. Verify a pressure change occurs for each solenoid when performing the solenoid test. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If a pressure change does not occur Replace the Q8 Control Solenoid Valve Assembly. If a pressure does occur
  4. Verify the conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.

P2723 or P2724 - Control Valve Upper Body Assembly (304)

1-2-3-4 Clutch Regulator Valve (337) stuck/sticking - debris, binding, damaged valve, or scored bore.

P2723 - Q8 Control Solenoid Valve Assembly (314)

Refer to document PIP 4304A. DTC P2723 may be set with DTC P0878.

P2723 or P2724 - Q8 Control Solenoid Valve Assembly (314)

  1. O-ring seal leaking.
  2. Valve body filter plate assembly cracked, blocked, or damaged gasket seal.

P2723 - Control Valve Upper Body Assembly (304)

Clutch Select Valve 3 (352) stuck/sticking - debris, binding, damaged valve, or scored bore.

P2723 - A/Trans Fluid Pump Cover Assembly (219)

Pump Tower Seals (230) damaged/leaking.

P2723 - 1-2-3-4 and 3-5-R Clutch Housing Assembly (51)

  1. 1-2-3-4 Clutch Piston (414) cracked/damaged/leaking.
  2. Housing/hub weld cracked/leaking.
  3. 1-2-3-4 Clutch Backing Plate Retaining Ring (429) not seated/oriented, causing clutch pack/piston over travel.

P2723 - Control (with body and valve) Valve Assembly (21)

Valve Body to Pump Transfer Seal Assembly (19) damaged/leaking.

P2723 - Torque Converter (w/Fluid Pump) Housing Assembly (2)

  1. Fluid pump housing vanes/rotor/slide damaged/scored.
  2. Fluid pump or torque converter overstressed due to high temperatures.

P2723 - Automatic Transmission Fluid Filter Assembly (26)

Oil filter (26) or filter seal (25) loose or damaged.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The pressure control solenoid 5 is part of the control solenoid valve assembly which has no serviceable parts. The normally low pressure control solenoid 5 regulates and directs oil pressure to the 1-2-3-4 clutch regulator valve and 1-2-3-4 clutch boost valve. Increasing pressure control solenoid 5 pressure increases pressure to the 1-2-3-4 clutch. The Transmission Control Module varies the current to the pressure control solenoid 5 through a low side driver. Increasing the current to pressure control solenoid 5 increases oil pressure by closing OFF the solenoid exhaust port. Decreasing the current to pressure control solenoid 5 decreases oil pressure by opening the exhaust port. Pressure control solenoid 5 power is supplied by the Transmission Control Module through a high side driver. The high side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected, the high side driver will reset.

P2728, P2729, or P2730

  1. DTCs P2728, P2729, or P2730 is not set.
  2. The ignition voltage is between 8.6-32 V.
  3. The engine speed is between 400-7,500 RPM for 5 s.
  4. The pressure control solenoid valve 5 is commanded ON.

P2728

The Transmission Control Module detects an internal electrical performance malfunction of the clutch pressure control solenoid valve 5 control circuit where the measured clutch pressure control solenoid valve 5 current does not equal the commanded clutch pressure control solenoid valve 5 current for 5 s.

P2729

The Transmission Control Module detects a short to ground on the clutch pressure control solenoid valve 5 control circuit for 1 s.

P2730

The Transmission Control Module detects an open or short to voltage on the clutch pressure control solenoid valve 5 control circuit for 1 s.

P2728

  1. DTC P2728 is a Type C DTC.
  2. The TCM freezes transmission adaptive functions.

P2729

  1. DTC P2729 is a Type A DTC.
  2. The TCM freezes transmission adaptive functions.
  3. The TCM commands maximum line pressure.
  4. The TCM inhibits TAP Up/Down function.
  5. The TCM inhibits engine braking.
  6. The TCM inhibits neutral idle.
  7. The TCM cancels Tow/Haul mode function.
  8. The TCM inhibits auto grade braking.
  9. The TCM commands neutral gear if output speed sensor signal is 1,350 RPM or greater.
  10. The TCM commands 2nd gear if output speed sensor signal is less than 1,350 RPM.

P2730

  1. DTC P2730 is a Type A DTC.
  2. The TCM forces TCC OFF.
  3. The TCM commands maximum line pressure.
  4. The TCM inhibits TAP Up/Down function.
  5. The TCM turns OFF the high side driver.
  6. The TCM inhibits engine braking.
  7. The ECM commands a reduction in engine torque based on input form the speed sensor.
  8. The TCM inhibits neutral idle.
  9. The TCM inhibits manual shifting.
  10. The TCM inhibits auto grade braking.
  11. The TCM inhibits Tow/Haul function.
  1. DTC P2728 is a Type C DTC.
  2. DTCs P2729 and P2730 are Type A DTCs.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  2. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  3. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Operate the vehicle in drive range. Allow the transmission to shift through all forward gear ranges.
  2. Verify the scan tool parameters listed below do not display Malfunction: Pressure Control Solenoid Valve 5 Performance Test Status Pressure Control Solenoid Valve 5 Control Circuit High Voltage Test Status Pressure Control Solenoid Valve 5 Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  5. All OK.
  1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
  2. Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If contaminated Clean as necessary. If not contaminated
  3. Verify the resistance is within the specified range for each solenoid. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If resistance is not within range Replace the Q8 Control Solenoid Valve Assembly If resistance is within range
  4. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  5. Connect DT-47825-10 jumper harness between the vehicle wire harness electrical connector and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  6. Verify the scan tool parameters listed below do not display Malfunction: Pressure Control Solenoid Valve 5 Performance Test Status Pressure Control Solenoid Valve 5 Control Circuit High Voltage Test Status Pressure Control Solenoid Valve 5 Control Circuit Low Voltage Test Status If Malfunction is displayed Replace the Q8 Control Solenoid Valve Assembly. If Malfunction is not displayed
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The torque converter clutch (TCC) pressure control solenoid is part of the control solenoid valve assembly which has no serviceable parts. The normally low TCC pressure control solenoid regulates oil pressure to the TCC regulator valve and TCC control valve. Increasing TCC pressure control solenoid oil pressure increases oil pressure to the torque converter to apply the clutch. The Transmission Control Module varies the current to the TCC pressure control solenoid through a low side driver. Increasing current to the TCC pressure control solenoid increase oil pressure by closing OFF the solenoid exhaust port. Decreasing current to the TCC pressure control solenoid decreases oil pressure by opening up the solenoid exhaust port. The TCC pressure control solenoid power is supplied by the Transmission Control Module through a high side driver. The high side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected, the high side driver will reset.

P2762

  1. DTC P2762 is not set.
  2. The engine speed is between 400-7,500 RPM for 5 s.
  3. The ignition voltage is between 8.6-32 V.

P2763

  1. DTCs P2763, P0658, or P0659 is not set.
  2. The engine speed is between 400-7,500 RPM for 5 s.
  3. The ignition voltage is between 8.6-32 V.
  4. The high side driver is enabled.

P2764

  1. DTC P2764, P0658, or P0659 is not set.
  2. The engine speed is between 400-7,500 RPM for 5 s.
  3. The ignition voltage is between 8.6-32 V.
  4. The high side driver is enabled.

P2762

The Transmission Control Module detects an internal electrical performance malfunction of the TCC pressure control solenoid control circuit where the measured TCC pressure control solenoid current does not equal the commanded TCC pressure control solenoid current for 5 s.

P2763

The Transmission Control Module detects an open/high resistance or short to voltage on the TCC pressure control solenoid control circuit for 5 s.

P2764

The Transmission Control Module detects a short to ground on the TCC pressure control solenoid control circuit for 1 min.

P2762

DTC P2762 is a Type C DTC.

P2763

  1. DTC P2763 is a Type B DTC.
  2. The TCM inhibits TCC.
  3. The TCM commands maximum line pressure.
  4. The TCM freezes transmission adaptive functions.
  5. The TCM enables Torque management.
  6. The TCM inhibits TAP Up/Down function.
  7. The TCM inhibits manual shifting of forward gears.
  8. The TCM inhibits 6th gear in hot mode operation.

P2764

  1. DTC P2764 is a Type A DTC.
  2. The TCM turns off the high side driver.
  3. The TCM inhibits TCC.
  4. The TCM freezes transmission adaptive functions.
  5. The TCM commands maximum line pressure.
  6. The TCM inhibits TAP Up/Down function.
  7. The TCM inhibits Manual Up/Down Shift with the shift selector.
  8. The TCM inhibits neutral idle.
  9. The ECM reduces engine torque based on input speed.
  1. DTC P2762 is a Type C DTC.
  2. DTC P2763 is a Type B DTC.
  3. DTC P2764 is a Type A DTC.

Schematic Reference

Connector End View Reference

  1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
  2. «INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

  1. «Transmission General Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-general-description)
  2. «Transmission Component and System Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation__transmission-component-and-system-description)
  3. «Electronic Component Description»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-description-and-operation)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-10 Jumper Harness

For equivalent regional tools, refer to Special Tools .

  1. Operate the vehicle in drive range and ensure TCC is commanded ON for 1 minute.
  2. Verify the scan tool parameters listed below do not display Malfunction: TCC Pressure Control Solenoid Valve Performance Test Status TCC Pressure Control Solenoid Valve Control Circuit High Voltage Test Status TCC Pressure Control Solenoid Valve Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  5. All OK.
  1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
  2. Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If contaminated Clean as necessary. If not contaminated
  3. Verify the resistance is within the specified range for each solenoid. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If resistance is not within range Replace the Q8 Control Solenoid Valve Assembly. If resistance is within range
  4. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  5. Connect DT-47825-10 jumper harness between the vehicle wire harness electrical connector and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  6. Verify the scan tool parameters do not display Malfunction: TCC Pressure Control Solenoid Valve Performance Test Status TCC Pressure Control Solenoid Valve Control Circuit High Voltage Test Status TCC Pressure Control Solenoid Valve Control Circuit Low Voltage Test Status If Malfunction is displayed Replace the Q8 Control Solenoid Valve Assembly. If Malfunction is not displayed
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Reset Transmission Adapts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, programming, and setup.

Symptoms - Automatic Transmission

IMPORTANTUse the symptom tables only if the following conditions are met: Refer to Diagnostic Starting Point - Vehicle . There are no DTCs set. The control modules can communicate via the serial data link. Review the system operation in order to familiarize yourself with the system functions. Refer to Transmission General Description , and Transmission Component and System Description .

Visual/Physical Inspection

Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. Fluid Diagnosis «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) «Fluid Pressure High or Low»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__fluid-pressure-high-or-low) «Automatic Transmission Fluid Leaks»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__automatic-transmission-fluid-leaks) «Fluid Leak Diagnosis»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures)
  2. Noise and Vibration Diagnosis «Whine/Growl Noise That Changes with Vehicle Speed»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__whinegrowl-noise-that-changes-with-vehicle) «Noise in First or Reverse Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__noise-in-first-or-reverse-gear) «Noise in First, Second, Third, Fourth, Fifth, or Reverse Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__noise-in-first-second-third-fourth) «Noise in First, Second, Sixth, or Reverse Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__noise-in-first-second-sixth-or) «Noise in Second or Sixth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__noise-in-second-or-sixth-gear) «Noise During 3-4 or 4-3 Shifts»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__noise-during-3-4-or-4-3-shifts) «Noise in Fourth, Fifth, or Sixth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__noise-in-fourth-fifth-or-sixth) «Vibration»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__vibration) «Flex Plate/Torque Converter Vibration Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures) «Noise and Vibration Analysis»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__noise-and-vibration-analysis)
  3. Range Performance Diagnosis «No Park or Drive»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__no-park-or-drive) «No Drive in All Ranges»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__no-drive-in-all-ranges) «No Reverse Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__no-reverse-gear)
  4. Shift Quality Feel Diagnosis «Harsh Garage Shift»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__harsh-garage-shift) «Harsh, Soft, Delayed or Slipping First or Reverse Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__harsh-soft-delayed-or-slipping-first) «Harsh, Soft, Delayed or Slipping 1-2-3-4 Shift»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__harsh-soft-delayed-or-slipping-1-2-3-4) «Harsh, Soft, Delayed or Slipping 4-5-6 Shift»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__harsh-soft-delayed-or-slipping-4-5-6) «Harsh, Soft, Delayed or Slipping Third, Fifth, or Reverse Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__harsh-soft-delayed-or-slipping-third) «Harsh, Soft, Delayed or Slipping Second or Sixth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__harsh-soft-delayed-or-slipping-second)
  5. Shift Pattern «No First Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__no-first-gear) «No First and Reverse Gears»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__no-first-and-reverse-gears) «No First, Second, Third, and Fourth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__no-first-second-third-and-fourth) «No Second and Sixth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__no-second-and-sixth-gear) «No Fourth, Fifth, and Sixth Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__no-fourth-fifth-and-sixth-gear) «No Third, Fifth, and Reverse Gear»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__no-third-fifth-and-reverse-gear)
  6. Torque Converter Diagnosis «Torque Converter Diagnosis»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures) «No Torque Converter Clutch Apply»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__no-torque-converter-clutch-apply) «No Torque Converter Clutch Release»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__no-torque-converter-clutch-release)
  7. Symptom Not Found or No Symptom Detected «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) «Road Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__road-test) «Line Pressure Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures)

Control Solenoid Valve and Transmission Control Module Assembly Inspection

During transmission manufacturing and assembly, small pieces of material may become dislodged. This may also happen after the transmission has been in operation for a period of time. Because the transmission control solenoid valve assembly is continually immersed in transmission oil, material particles or slivers of metallic debris may become deposited on the control solenoid valve assembly. Often this material is very small and can be hard to see. For this reason, it is important that the control solenoid valve assembly be thoroughly inspected.

A thorough inspection of the control solenoid valve assembly should include the following

  1. Clean inspection area - Like all transmission service work, cleanliness is very important. Be sure the area where you are inspecting is free of dust and dirt. Have non-glossy white or lightly colored paper down on the inspection surface. This will enhance the lighting and help to see particles that have come from the control solenoid valve assembly.
  2. Lighting - Good lighting is necessary for a thorough inspection. If shop lighting is limited, use natural light. A second source of lighting, such as a penlight, is helpful for close examination. A magnifying glass can also be helpful to see into difficult places.
  3. Cleaning - Clean shop air may be used for spot cleaning as long as the debris can be removed with out it becoming lodged somewhere else. It is best to rinse or flush particles away with GM Brake Parts Cleaner. Do not use a cloth rag to wipe the control solenoid valve assembly, as it could leave lint behind.

Scheme 29

Scheme 29: Control Solenoid Valve Assembly Housing and Filter Plate
Scheme 29: Control Solenoid Valve Assembly Housing and Filter Plate
  1. Inspect the control solenoid valve assembly housing (1) for damage, cracks, or parting seam (4) separation. Inspect all housing lock tabs (2). Any defect will need to be evaluated for critical operation. Ensure all screws along the control solenoid valve assembly housing are present. Remove and closely examine the filter plate assembly (3) for sediment or debris attached to the screen. If sediment or debris is found on the filter screen, be sure to inspect the solenoid supply or control ports that correspond to location of the debris on the filter plate screen. Inspect the filter plate gasket for proper sealing. If poor sealing is found, be sure to inspect the affected solenoid fluid port entrance and exit for sediment or debris deposits. Thoroughly flush the solenoid cavity with GM Brake Parts Cleaner and replace the filter plate assembly (3). It is not necessary to remove all clutch plate soot from the entire surface of the control solenoid valve assembly housing. Inspect the control solenoid valve assembly filter plate retaining tabs (7). Broken or missing tabs do not require the control solenoid valve assembly be replaced. The filter plate can still be adequately aligned using the bolt hole sleeves. Early design control solenoid valve assembly use four filter plate retaining tabs (7).
  2. Examine the 16-way connector (5) cavity for material that could make contact between the electrical pins. Also, look for bent or loose connector pins and ensure the connector lock (6) is functioning and is in good condition.

Scheme 30

Scheme 30: Control Solenoid Valve Assembly Inspection - Solenoids, Sensors, and Contacts
Scheme 30: Control Solenoid Valve Assembly Inspection - Solenoids, Sensors, and Contacts
CalloutComponent Name
1Pressure Control Solenoid 3 (PCS3)
2Pressure Control Solenoid 4 (PCS4)
3Pressure Control Solenoid 2 (PCS2)
4Shift Solenoid 2 (SS2)
5Torque Converter Clutch (TCC) Solenoid
6Pressure Control Solenoid 5 (PCS5)
7Pressure Control Solenoid 1 (PCS1)
8Shift Solenoid 1 (SS1)
9Transmission Fluid Temperature (TFT) Sensor
10Input Speed Sensor/Output Speed Sensor (ISS/OSS) Connector
11Pressure Control Solenoid 3 (PCS3) Contact Lead
12Pressure Control Solenoid 4 (PCS4) Contact Lead
13Pressure Control Solenoid 2 (PCS2) Contact Lead
14Shift Solenoid 2 (SS2) Contact Lead
15Torque Converter Clutch (TCC) Solenoid Contact Lead
16Pressure Control Solenoid 5 (PCS5) Contact Lead
17Pressure Control Solenoid 1 (PCS1) Contact Lead
18Shift Solenoid 1 (SS1) Contact Lead
19Internal Mode Switch (IMS) Connector
20Metallic Slivers, Debris or Sediment
  1. With the filter plate removed, the control solenoid valve assemblies (1-8) can be inspected. Closely examine the solenoid electrical contact lead solder connections (11-18). Look for material that could make contact between the electrical leads. This is where material particles, metallic slivers, debris or sediment (20) can collect. Carefully inspect all sixteen solenoid electrical contact leads (11-18) for build up of material that could form an electrical short. Inspect the solenoid contact leads (11-18) for terminal separation or weak solder joints. Thoroughly flush away all debris with GM Brake Parts Cleaner.
  2. Inspect the transmission fluid temperature (TFT) sensor (9), the input speed sensor/output speed sensor (ISS/OSS) connector (10), and the internal mode switch (IMS) connector (19). Look inside the connector cavities for material that could make contact between the electrical pins. Also look for bent or loose electrical pins. If the TFT sensor (9) is heavily coated with clutch soot, rinse with GM Brake Parts Cleaner.
  3. Check the resistance of the solenoids at room temperature and verify with the following table. If the resistance is not within the expected range, carefully inspect the solenoid contact leads.
Solenoid NameIllustration Number of Solenoid LeadExpected Resistance (Ohms)
Pressure Control Solenoid 3 (PCS3)114.5-5.5 ohms
Pressure Control Solenoid 4 (PCS4)124.5-5.5 ohms
Pressure Control Solenoid 2 (PCS2)134.5-5.5 ohms
Shift Solenoid 2 (SS2)1423.5-24.5 ohms
Torque Converter Clutch (TCC) Solenoid154.5-5.5 ohms
Pressure Control Solenoid 5 (PCS5)164.5-5.5 ohms
Pressure Control Solenoid 1 (PCS1)174.5-5.5 ohms
Shift Solenoid 1 (SS1)1823.5-24.5 ohms

Solenoid Resistance

Scheme 31

Scheme 31: Control Solenoid Valve Assembly Supply and Control Fluid Inspection
Scheme 31: Control Solenoid Valve Assembly Supply and Control Fluid Inspection
CalloutComponent Name
1Shift Solenoid 1 Supply Port
2Shift Solenoid 1 Control Port
3Line Pressure Control Solenoid 1 Control Port
4Line Pressure Control Solenoid 1 Supply Port
5Pressure Control Solenoid 5 Supply Port
6Pressure Control Solenoid 5 Control Port
7TCC Pressure Control Solenoid Control Port
8TCC Pressure Control Solenoid Supply Port
9Shift Solenoid 2 Supply Port
10Shift Solenoid 2 Control Port
11Pressure Control Solenoid 2 Control Port
12Pressure Control Solenoid 2 Supply Port
13Pressure Control Solenoid 4 Supply Port
14Pressure Control Solenoid 4 Control Port
15Pressure Control Solenoid 3 Control Port
16Pressure Control Solenoid 3 Supply Port
17Transmission Fluid Pressure (TFP) Switch 5
18Transmission Fluid Pressure (TFP) Switch 3
19Transmission Fluid Pressure (TFP) Switch 1
20Transmission Fluid Pressure (TFP) Switch 4
21TFP Switch Membrane
22TFP Switch Gasket
  1. With the filter plate removed, the control solenoid valve fluid supply and control ports (1-16) can be inspected. Solenoid openings are identified in the illustration. Inspect the following supply and control opening for material particles, metallic slivers, debris, or sediment. Look into solenoid fluid supply openings 1, 4, 5, 8, 9, 12, 13, and 16. Look inside the solenoid fluid control ports 2, 3, 6, 7, 10, 11, 14 and 15. If sediment or debris is found in any one of these port openings, look for holes or tears in the filter plate screen. The filter plate gasket may be leaking caused by a torn gasket, poor sealing, or a deformed plate. As necessary, thoroughly flush away all debris in the supply and control fluid ports with GM Brake Parts Cleaner.
  2. Inspect the four transmission fluid pressure (TFP) switches (17-20) for trapped debris or sediment. Any sediment or debris found under a switch membrane requires the control solenoid valve assembly to be replaced. Check all TFP switch membranes (21) for cracks, cuts or pin holes. Ensure all TFP switch gaskets (22) are secure and are not deformed, torn, or improperly seated. As necessary, thoroughly rinse debris and sediment from the top of the switches. It is not necessary to remove the clutch plate soot from the entire surface of the control solenoid valve assembly housing.

Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test

Special Tools

  1. DT-47825-10 Jumper Harness
  2. J 35616 GM-Approved Terminal Test Kit
  3. J 38522 Variable Signal Generator

Scheme 32

Scheme 32
Scheme 32

The purpose of this test is to provide a simulated input/output speed sensor (ISS/OSS) signal to the control solenoid valve assembly ISS/OSS input circuits.

Transmission Input Speed Sensor

  1. Ignition OFF, connect the DT-47825-10 jumper harness between the vehicle wire harness electrical connector, and the control solenoid valve assembly electrical connector.
  2. Disconnect the ISS/OSS wiring harness connector X3 (1) from the control solenoid valve assembly.
  3. Ignition ON, test for 8.3-9.3 volts between the ISS/OSS voltage circuit terminal B on the control solenoid valve assembly and ground at the transmission case. If not within the specified range, replace the control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  4. Using the J 35616 terminal test kit , connect the J 38522 variable signal generator red lead to the ISS signal circuit terminal A on the TCM.
  5. Connect the black lead from the J 38522 variable signal generator to ground at the transmission case.
  6. Set the J 38522 variable signal generator to 5 volts, the frequency to 300, and the percent duty cycle to 50 or the normal position.
  7. Ignition ON, verify with a scan tool the Transmission ISS parameter is between 760-785 RPM. If not within the specified range, replace the control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .

Transmission Output Speed Sensor

  1. Ignition OFF, connect the DT-47825-10 jumper harness between the vehicle wire harness electrical connector, and the control solenoid valve assembly electrical connector.
  2. Disconnect the ISS/OSS wiring harness connector X3 (1) from the control solenoid valve assembly.
  3. Ignition ON, test for 8.3-9.3 volts between the ISS/OSS voltage circuit terminal B on the control solenoid valve assembly and ground at the transmission case. If not within the specified range, replace the control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  4. Using the J 35616 terminal test kit , connect the J 38522 variable signal generator red lead to the OSS signal circuit terminal C on the TCM.
  5. Connect the black lead from the J 38522 variable signal generator to ground at the transmission case.
  6. Set the J 38522 variable signal generator to 5 volts, the frequency to 300, and the percent duty cycle to 50 or the normal position.
  7. Ignition ON, verify with a scan tool the Transmission OSS parameter is between 495-505 RPM. If not within the specified range, replace the control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .

Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test

Special Tools

DT-47825 Control Solenoid Test Plate

The purpose of this procedure is to test the operation of the control solenoid valve assembly for a stuck open or stuck closed solenoid. The DT-47825 control solenoid test plate bolts to the mounting surface of the control solenoid valve assembly. Pressurized air is routed into the aluminum test block, through the control solenoid valve assembly, and back to the gauge on the test block.

A pressure gauge is used to measure the pressurized air through the solenoid control ports. When a solenoid is commanded ON with the scan tool, pressurized air flows through the solenoid control port and displays on the pressure gauge. When the solenoid is commanded OFF with the scan tool, there is no pressurized air flow through the solenoid control port to the pressure gauge. The recommended shop air pressure for this test is 620.5-690.4 Kpa (90-100 psi).

Scheme 33

Scheme 33: Control Solenoid Valve Assembly with Control Solenoid Test Plate
Scheme 33: Control Solenoid Valve Assembly with Control Solenoid Test Plate
CalloutComponent Name
1Filter Plate Assembly
2Control Solenoid Valve Assembly
3DT-47825 Control Solenoid Test Plate
4Air Connection Port
5Transmission 16-Way Pass-Through Connector
6Electrical Connector Slide Lock
7A/Trans Manual Shift Shaft Position Switch Assembly Electrical Connector
8A/Trans Manual Shift Shaft Position Switch Assembly
9Bolt M6 x 14.5

Note. To avoid solenoid overheating and possible internal damage, do not continuously operate the solenoid for more than 2 minutes at a time.

The TCM will normally cycle some of the transmission solenoids ON and OFF to keep the solenoid passages clean and clear. This is a normal function and may cause the valves to cycle open and closed quickly when the TCM is powered up. This can make the pressure gauge needle flicker or move from high and low as the valves open and close, allowing air to exit the ports where the pressure gauge is not connected.

WARNINGUse of eye goggles is necessary to prevent personal injury.
WARNINGTo avoid transmission fluid contact with exposed skin, use shop towels to cover the test plate parts in order to prevent fluid from being released into the air, as any remaining transmission fluid in the control solenoid valve assembly will be forced out, and bodily injury may occur.

It is necessary to drain the control solenoid valve assembly of all remaining transmission fluid before attaching the test plate. Use caution when attaching air to the test plate, as any residual transmission fluid in the control solenoid valve assembly will be forced out. Use shop towels to cover the test plate ports in order to prevent fluid from being released into the air.

Preliminary Procedures

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/ats/i-2012-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the transmission fluid pan and filter. Refer to «Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  3. Remove the transmission electrical connector. Refer to «Automatic Transmission Electrical Connector Passage Sleeve Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  4. Remove the control solenoid valve assembly from the transmission. Refer to «Control Valve Lower Body and Upper Body Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle) .
  5. Ensure that the manual shift shaft position switch is disconnected and removed before performing the test. Failure to disconnect the switch will cause inaccurate test results and possible misdiagnosis.

Scheme 34

Scheme 34: Solenoid Testing Procedure
Scheme 34: Solenoid Testing Procedure
CalloutComponent Name
1Regulated Air Supply
2Test Ports
3Scan Tool
4Test Pressure Gauge
5Electrical Connector Sleeve
  1. Align and install the electrical connector sleeve to the control solenoid valve assembly and secure with the connector slide lock.
  2. If necessary, clean each side of the filter plate assembly and install the filter plate assembly back on the control solenoid valve assembly. Clean the mounting surface of the DT-47825 control solenoid test plate.
  3. Bolt the DT-47825 control solenoid test plate to the control solenoid valve assembly mounting surface. Use the bolts and washers supplied with the tool to attach the test block. Tighten the bolts to 5 N.m (44 lb in).
  4. Connect the test harness supplied with the DT-47825 control solenoid test plate to the vehicle harness and to the TCM. Engage the connector locks.
  5. Connect shop air to the DT-47825 control solenoid test plate air inlet. Do not exceed the recommended air pressure of 620.5-689.4 Kpa (90-100 psi).
  6. Connect the test pressure gauge to the test port for the solenoid to be tested.
  7. With the ignition ON and the scan tool communicating with the vehicle, command the solenoid to be tested ON and OFF. Watch the air pressure gauge for a change as you command the solenoid. Refer to Control Solenoid Valve Assembly Solenoid Performance Test Plate to Component Identification for correct solenoid function and test plate port connections for the solenoid being tested.
  8. The solenoid should allow air pressure to flow when commanded ON and prevent air pressure flow when commanded OFF. The test results are read on the pressure gauge.
  9. Command the solenoid valve ON and OFF several times to determine the condition of the solenoid in question. Release the test air pressure from the pressure gauge between solenoid tests.
SolenoidTest Plate PortCommanded State
ONOFF
PC Solenoid 2CFull pressure to gaugeNo pressure to gauge
PC Solenoid 3AFull pressure to gaugeNo pressure to gauge
PC Solenoid 4BFull pressure to gaugeNo pressure to gauge
PC Solenoid 5FFull pressure to gaugeNo pressure to gauge
Shift Solenoid 1HFull pressure to gaugeNo pressure to gauge
Shift Solenoid 2DFull pressure to gaugeNo pressure to gauge
TCC PC SolenoidEFull pressure to gaugeNo pressure to gauge
Line PC SolenoidGCommand to highest setting, full pressure to gaugeCommand to lowest setting, below 620.5 Kpa (90 psi) to gauge

Control Solenoid Valve Assembly Solenoid Performance Test Plate to Component Identification

Reset Transmission Adapts

The Reset Transmission Adapts is a procedure for automatic transmissions in which the shift pressure learn values of each individual clutch is reset to zero or a base calibrated value, in the transmission control module (TCM).

Once the transmission adapts are set to zero or a calibrated value, the vehicle is then road test under various drive cycle events for the TCM to relearn shift pressure values for the best possible shift feel in all gear ranges.

The Reset Transmission Adapts procedure must be performed when one of the following repairs have been made to the transmission. Failure to perform the procedure after one of the following repairs may result in poor transmission performance, DTCs being set, or customer dissatisfaction.

  1. Transmission internal service, repair or overhaul
  2. Valve body repair or replacement
  3. Control solenoid valve assembly replacement
  4. Any service/repair in response to a shift quality concern
  1. Install any components or connectors that have been removed or replaced during diagnosis.
  2. Perform any adjustments, programming or setup procedures that are required when a component or module is removed or replaced.
  3. Clear the DTCs.
  4. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes.
  5. Ignition ON, engine running, with a scan tool Reset Transmission Adapts.
  6. Perform the «Road Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__road-test) .
  7. Ignition OFF for 2 minutes.

Brake Pedal Position Sensor Learn

Brake Pedal Position Sensor Learn is a procedure for the ECM to determine the position of the brake pedal position (BPP) sensor when the brake pedal is in the released position.

  1. Ignition ON, Engine OFF. Verify with the scan tool, that no DTCs are set in the ECM or other control modules on the vehicle. If other DTCs are set, repair those DTCs first. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Clear the ECM of all DTCs.
  3. Ignition OFF for 2 minutes. Open and close the driver's door.
  4. Perform the following procedure twice: NOTE: Do not allow your foot to rest on the brake pedal in the fully release position when performing the following steps. Ignition ON, Engine OFF, transmission in Park, brake pedal in the fully released position. Depress the brake pedal fully. Release the brake and wait 10 seconds. Again, depress the brake pedal fully for a second time and release the brake pedal. Ignition OFF for 2 minutes. Open and close the driver's door.
  5. After performing the steps for a second time, the brake pedal sensor should be at the true minimum learned position.
  6. Ignition ON, Engine OFF. Verify with a scan tool, the BPP Sensor Learn Position parameter value does not change values, after several brake pedal applications.
  7. Perform the Body Control Module (BCM) brake pedal position sensor calibration. Refer to «Brake Pedal Position Sensor Calibration»(/cadillac/ats/i-2012-2014/remont/exterior-lights/#lighting-system-repair-instructions__brake-pedal-position-sensor-calibration) .

Transmission Fluid Level and Condition Check

This procedure checks both the transmission fluid level, as well as the condition of the fluid itself. Since the transmission on this vehicle is not equipped with a fill tube and dipstick, a tube in the bottom pan is used to set the fluid level.

More information, including an instructional video, can be found at the following GM training websites: www.gmtraining.com: 17041.62V - 6-Speed Automatic Transmission Fluid Checking and Filling Procedures, www.gmtrainingcollege.com: A26021.01T - Check and Fill Procedure for 6-Speed Automatic Transmissions.

CAUTIONThe transmission fluid level must be checked when the transmission fluid temperature (TFT) is between 30-50°C (86-122°F). If the TFT is not within this range, operate the vehicle or allow the fluid to cool as required. Setting the fluid level with a TFT outside this range will result in either an under or over-filled transmission. TFT>50°C=under-filled, TFT<30°C=over-filled. An under-filled transmission will cause premature component wear or damage. An over-filled transmission will cause fluid to discharge out the vent tube, fluid foaming, or pump cavitation.
  1. Observe the TFT using the driver information center (DIC) or a scan tool.
  2. Start and idle the engine.
  3. Depress the brake pedal and move the shift lever through each gear range. Pause for at least 3 seconds in each range. Move the shift lever back to PARK. Ensure the engine RPM is low (500-800 RPM).
  4. Allow the engine to idle for at least 1 minute.
  5. Raise the vehicle on a hoist. The vehicle must be level, with the engine running and the shift lever in the PARK range.
  6. Remove the trans oil level check plug (1) from the transmission fluid pan. Allow any fluid (2) to drain. If the fluid is flowing as a steady stream, wait until the fluid begins to drip. If no fluid comes out, add fluid until fluid drips out. Refer to «Transmission Fluid Fill Procedure»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-fill-procedure) .
  7. Inspect the fluid color. The fluid should be red or dark brown. If the fluid color is very dark or black and has a burnt odor, inspect the fluid and inside of the bottom pan for excessive metal particles or other debris. A small amount of "friction" material in the bottom pan is a "normal" condition. If large pieces and/or metal particles are noted in the fluid or bottom pan, flush the oil cooler and cooler lines and overhaul the transmission. If there are no signs of transmission internal damage noted, replace the fluid filter assembly, repair the oil cooler, and flush the cooler lines. Fluid that is cloudy or milky or appears to be contaminated with water indicates engine coolant or water contamination. Refer to «Engine Coolant/Water in Transmission»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__engine-coolantwater-in-transmission) .
  8. Replace the trans oil level check plug and tighten to 25 N.m (18 lb ft).
  9. Inspect for external leaks. Refer to «Fluid Leak Diagnosis»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures) .
  10. Reset the oil life monitor only if the fluid was changed.

Transmission Fluid Fill Procedure

Special Tools

  1. DT 47784 Transmission Fluid Fill Pan Adapter
  2. DT 45096 Transmission Oil Cooling System Flush and Flow Test Tool
  3. DT 45096-30 Transmission Cooler Flush Adapters
  4. DT 45096-40 Transflow Oil Fill Adapter

For equivalent regional tools, refer to Special Tools .

CAUTIONCheck the transmission fluid level immediately after adding fluid and before vehicle operation. Do not overfill the transmission. An overfilled transmission may result in foaming or fluid to be expelled out the vent tube when the vehicle is operated. Overfilling will result in possible damage to the transmission.

Check the transmission fluid level, refer to Transmission Fluid Level and Condition Check .

More information, including an instructional video, can be found at the following GM training websites: www.gmtraining.com: 17041.62V - 6-Speed Automatic Transmission Fluid Checking and Filling Procedures, www.gmtrainingcollege.com: A26021.01T - Check and Fill Procedure for 6-Speed Automatic Transmissions.

Fill Tube Plug Method

  1. Perform this procedure for vehicles with transmissions that are not equipped with a fill tube and dipstick. Based on accessibility, transmission fluid may be added through the fluid fill tube plug assembly (1) hole or through the oil level check plug (2) hole in the bottom of the transmission fluid pan.
  2. Clean around the fluid fill tube plug (1).
  3. Unlock the fill tube plug by lifting the plunger. Once the plunger is lifted, remove the entire plug assembly.
  4. Determine the approximate amount of fluid needed to fill the transmission, based on the repair performed. Refer to «Fluid Capacity Specifications»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__fluid-capacity-specifications) . To avoid an under-fill condition, slightly overfill the transmission, and then allow the extra fluid to drain out through the oil level check plug during the transmission fluid level and condition check procedure.
  5. Using the DT 45096-40 transflow oil fill adapter (1) and the DT 45096 flush and flow test tool (2), or a suitable hand pump, add transmission fluid through the fill tube plug opening. Refer to «Transmission Fluid Cooler Flushing and Flow Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-cooler-flushing-and-flow) for complete DT 45096 flush and flow test tool operating instructions. Use the FLOW position on the main function switch to pump the fluid.
  6. Check the fluid level. Refer to «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) .

Check Plug Method

Scheme 35

Scheme 35
Scheme 35
  1. Remove the oil level check plug.
  2. Install the DT 47784 fluid fill pan adapter (1) and, if necessary, one adapter from the DT 45096-30 cooler flush adapters (2).
  3. Determine the approximate amount of fluid needed to fill the transmission, based on the repair performed. Refer to «Fluid Capacity Specifications»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__fluid-capacity-specifications) . To avoid an under-fill condition, slightly overfill the transmission, and then allow the extra fluid to drain out through the oil level check plug during the tranmission fluid level and condition check procedure.
  4. Using the DT 47784 fluid fill pan adapter (1), DT 45096-30 cooler flush adapters (2), and the DT 45096 flush and flow test tool (3), add transmission fluid through the check plug hole. Refer to «Transmission Fluid Cooler Flushing and Flow Test»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-cooler-flushing-and-flow) for complete J 45096 operating instructions. Use the FLOW position on the main function switch to pump the fluid.
  5. Start the engine and move the shift lever through each gear range. Pause for at least 3 seconds in each gear range.
  6. With the engine still running, remove the DT 47784 fluid fill pan adapter (1), (2), and DT 45096 flush and flow test tool (3) and then check the fluid level. Refer to «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) .

Scheme 36

Scheme 36: Line Pressure Check
Scheme 36: Line Pressure Check

Special Tools

GE 21867 Pressure Gauge

For equivalent regional tools, refer to Special Tools .

  1. Install a scan tool.
  2. Start the engine.
  3. Inspect the transmission for the proper fluid level. Refer to «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) .
  4. Use the scan tool to inspect for any active or stored diagnostic trouble codes.
  5. Inspect the manual linkage at the transmission for proper function.
  6. Turn the engine OFF.
  7. Remove the line pressure test hole plug.
  8. Install the GE 21867 pressure gauge.
  9. Access the Scan Tool Transmission Output Controls for the Line PC Solenoid.
  10. Start the engine.
  11. Use the scan tool to increase and decrease line pressure, allowing the pressure to stabilize between increments.
  12. Compare the pressure readings on the gauge with the table below.
  13. If the pressure readings on the gauge are erratic, or are more than 10% greater or less than the range specified in the table below, refer to «Fluid Pressure High or Low»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__fluid-pressure-high-or-low) .
  14. Turn the engine OFF.
  15. Remove the GE 21867 pressure gauge.
  16. Install the line pressure test hole plug. Tighten the pressure plug to 11 N.m (97 lb in).
Scan tool Line PC Solenoid Commanded State (KPa)Approximate line pressure shown on pressure gauge @ 1500 RPM
KpaPSI
None310-55045-80
200655-90095-130
4001100-1310160-190
6001520-1725220-250
8001860-2070270-300
10001860-2070270-300
12001860-2070270-300
14001860-2070270-300
16001860-2070270-300
18001860-2070270-300
20001860-2070270-300

Line Pressure

Road Test

The following test provides a method of evaluating the condition of the automatic transmission. The test is structured so that most driving conditions would be achieved. The test is divided into the following parts

  1. Electrical Function Check
  2. Upshift Control and Torque Converter Clutch (TCC) Apply
  3. Part Throttle Step-In Downshifts
  4. Manual Downshifts
  5. Coasting Downshifts
  6. Manual Gear Range Selection REVERSE Driver Shift Control

Note. Complete the test in the sequence given. Incomplete testing cannot guarantee an accurate evaluation.

Before the road test, ensure the following

  1. The engine is performing properly.
  2. Transmission fluid level is correct. Refer to «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) .
  3. Tire pressure is correct.

During the road test

  1. Perform the test only when traffic conditions permit.
  2. Operate the vehicle in a controlled, safe manner.
  3. Observe all traffic regulations.
  4. View the scan tool data while conducting this test. Take along qualified help in order to operate the vehicle safely.
  5. Observe any unusual sounds or smells.

After the road test, check the following

  1. Inspect for proper transmission fluid level. Refer to «Transmission Fluid Level and Condition Check»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) .
  2. Inspect for any diagnostic trouble codes (DTCs) that may have set during the testing. Refer to the applicable DTC.
  3. Monitor the scan tool data for any abnormal readings or data.
  4. Inspect for fluid leaks. Refer to «Fluid Leak Diagnosis»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures) .

Electrical Function Check

Perform this procedure first in order to ensure the electronic transmission components are functioning properly. If these components are not checked, a simple electrical condition could be misdiagnosed.

  1. Connect the scan tool.
  2. Ensure the gear selector is in PARK and set the parking brake.
  3. Start the engine.
  4. Verify that the following scan tool data can be obtained and is functioning properly. Refer to «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for typical data values. Data that is questionable may indicate a concern. Engine Speed Transmission ISS Transmission OSS Vehicle Speed IMS Commanded Gear Gear Ratio Line PC Sol. Pressure Cmd. Brake Switch ECT, Engine Data List Trans. Fluid Temp. TCM Temperature Calc. Throttle Position Ignition Voltage TFP Switch 1 TFP Switch 3 TFP Switch 4 TFP Switch 5 PC Sol. 2 Pressure Cmd. PC Sol. 3 Pressure Cmd. PC Sol. 4 Pressure Cmd. PC Sol. 5 Pressure Cmd. Shift Solenoid 1 Shift Solenoid 2 TCC PC Sol. Duty Cycle TCC Slip Speed
  5. Check the garage shifts. Apply the brake pedal and ensure the parking brake is set. Move the gear selector through the following ranges: PARK to REVERSE REVERSE to NEUTRAL NEUTRAL to DRIVE DRIVE to REVERSE REVERSE to DRIVE Pause 2 to 3 seconds in each gear position. Verify the gear engagements are immediate (less than 2 seconds to complete if trans fluid temperature is above 20°C) and not harsh. Note that these shifts may be almost imperceptible in some applications. Using the scan tool to monitor Transmission ISS achieving 0 rpm can be used to check delay in these cases.
  6. Monitor transmission range on the scan tool, transmission data list. Apply the brake pedal and ensure the parking brake is set. Move the gear selector through all ranges. Pause 2 to 3 seconds in each range. Return gear selector to PARK. Verify that all selector positions match the scan tool display.
  7. Check throttle position input. Apply the brake pedal and ensure the parking brake is set. Ensure the gear selector is in PARK. Monitor the scan tool Calc. Throttle Position while increasing and decreasing engine speed with the throttle pedal. The scan tool Calc. Throttle Position percentage should increase and decrease with engine speed.

If any of the above checks do not perform properly, record the result for reference after completion of the road test.

Upshift Control and Torque Converter Clutch (TCC) Apply

The TCM calculates the upshift points based primarily on 2 inputs: throttle position and vehicle speed. When the TCM determines that conditions are met for a shift to occur, the TCM commands the shift by varying current to the appropriate PC solenoids to control oncoming and offgoing clutch pressures.

Perform the following steps

  1. Monitor the following scan tool parameters: Calc. Throttle Position Vehicle Speed Engine Speed Transmission ISS Transmission OSS Commanded Gear TCC PC Sol. Pressure Cmd. TCC Slip Speed TFP Switch 1 TFP Switch 3 TFP Switch 4 TFP Switch 5 PC Sol. 2 Pressure Cmd. PC Sol. 3 Pressure Cmd. PC Sol. 4 Pressure Cmd. PC Sol. 5 Pressure Cmd. Shift Solenoid 1 and 2
  2. Place the gear selector in the DRIVE position.
  3. Accelerate the vehicle using a steady throttle position between 15 and 20 percent. Hold the throttle steady.
  4. As the transmission upshifts, there should be a noticeable shift feel or engine speed change within 1 to 2 seconds of the commanded gear change. The PC solenoid pressure command should change to "YES" for the oncoming clutch and the PC solenoid pressure command should change to "NO" for the offgoing clutch.
  5. Note any harsh, soft or delayed shifts or slipping. Note any noise or vibration.
  6. The TCC feel may not be noticeable. In many applications the TCC will apply after the 1-2 shift and TCC events will not be easily detected using engine speed.
  7. Monitor TCC PC solenoid pressure command while driving and check TCC slip speed when the pressure command indicates that the TCC is commanded to apply: When the TCC applies, slip speed should be controlled to below 100 RPM when the transmission is not shifting and the throttle is held steady. If the TCC slip exceeds this value for more than 6 seconds after the TCC PC Sol. Pressure Command indicates that the TCC is commanded on: Check for DTCs. Refer to «Torque Converter Diagnosis»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures) .

Part Throttle Step-In Downshifts

  1. Place the gear selector in the DRIVE position.
  2. Accelerate the vehicle at light throttle (5-15 percent) until 3rd gear is just achieved.
  3. Quickly increase throttle angle until commanded gear indicates that a downshift to 2nd gear is commanded.
  4. Verify that the transmission downshifts within 2 seconds of the throttle movement.
  5. Repeat steps 2 to 4 at higher speed to achieve 4th gear and then step in to command a 4th gear to 3rd gear downshift.
  6. Repeat steps 2 to 4 at higher speed to achieve 5th gear and then step in to command a 5th to 4th gear downshift.
  7. Repeat steps 2 to 4 at higher speed to achieve 6th gear and then step in to command a 6th gear to 5th gear downshift.
  8. Note any harsh, soft or delayed shifts or slipping. Note any noise or vibration.

Manual Downshifts

Manual downshift testing is not required since all vehicles equipped with the 6L45/50/80/90 are also equipped with some form of Driver Shift Control (DSC). The TCM will automatically override DSC downshifts to protect the transmission from damage.

Coasting Downshifts

  1. Place the gear selector in the DRIVE position.
  2. Accelerate the vehicle to 6th gear with the TCC applied.
  3. Release the throttle and apply the brakes.
  4. Verify that the downshifts occur as commanded by monitoring gear ratio, which should change after commanded gear changes.

Manual Gear Range Selection

This application does not utilize manual forward gear ranges.

Reverse

Perform the following test using a 10-15 percent throttle position.

  1. With the vehicle stopped, move the gear selector to REVERSE.
  2. Slowly accelerate the vehicle.
  3. Verify that there is no noticeable slip, noise or vibration.

Driver Shift Control (DSC)

Refer to the owner's manual for specific instructions on the type of DSC available in this application. Utilize the DSC to ensure that the transmission responds appropriately to driver's commands. The TCM will upshift automatically when maximum engine speed is achieved and will protect from any downshift which may cause excessive engine RPMs.

Torque Converter Stator

The torque converter stator roller clutch can have 2 different malfunctions.

  1. The stator assembly freewheels in both directions.
  2. The stator assembly remains locked up in both directions.

Poor Acceleration at Low Speed - Stator Roller Clutch Freewheels at All Times

If the stator is freewheeling at all times, the vehicle tends to have poor acceleration from a standstill and at speeds below 48-55 km/h (30-34 mph). At speeds above 48-55 km/h (30-34 mph), the vehicle may act normally.

For poor acceleration at low speeds, you should first determine that the exhaust system is not blocked, and the transmission is in First gear when starting out. If the engine freely accelerates to high RPM in NEUTRAL, you can assume that the engine and the exhaust system are normal. Check for poor performance in DRIVE and REVERSE to help determine if the stator is freewheeling at all times.

Poor Acceleration at High Speed - Stator Roller Clutch is Locked Up at All Times

If the stator is locked up at all times, performance is normal when accelerating from a standstill. Engine RPM and vehicle speed are limited or restricted at speeds above 48-55 km/h (30-34 mph). Visual examination of the converter may reveal a blue color from overheating.

Torque Converter Bearing Noise

Note. Do not confuse this noise with pump whine noise, which is usually noticeable in all gear ranges. Pump whine will vary with line pressure.

Torque converter whine is noticed when the vehicle is stopped and the transmission is in DRIVE or REVERSE. This noise will increase as you increase the engine RPM. The noise will stop when the vehicle is moving or when you apply the torque converter clutch, because there is no slip speed across the bearings.

Perform a stall test to verify that the noise is actually coming from the torque converter

  1. Place your foot on the brake.
  2. Put the gear selector in DRIVE.
  3. Depress the accelerator to approximately 1 200 RPM for no more than six seconds.

A torque converter noise will increase under this load.

Torque Converter Clutch

The torque converter clutch (TCC) is applied by fluid pressure, which is controlled by a TCC pressure control (PC) solenoid. This solenoid is part of the control solenoid valve assembly, which is located inside the automatic transmission assembly. The solenoid is controlled through a combination of computer controlled switches and sensors. Electronically controlled capacity clutch (ECCC) is controlled slip across the TCC.

Torque Converter Clutch Shudder

The key to diagnosing torque converter clutch (TCC) shudder is to note when it happens and under what conditions. TCC shudder should only occur during the apply, release, or ECCC conditions of the converter clutch. Shudder should never occur after the TCC is fully locked (approximately 0 RPM slip).

If Shudder Occurs During TCC Apply, Release, and ECCC

If the shudder occurs while the TCC is applying, the problem can be within the transmission or the torque converter. Something is causing one of the following conditions to occur

  1. The clutch is not engaging completely.
  2. The clutch is not releasing completely.
  3. The clutch is releasing and applying rapidly and continuously.

One of the following conditions may be causing the TCC Shudder to occur

  1. Leaking turbine shaft/TCC seals
  2. A restricted release orifice
  3. A distorted clutch or converter cover due to long flexplate to converter bolts
  4. Defective friction material on the TCC plate

If Shudder Occurs After TCC has Locked

Engine problems may go unnoticed under light throttle and load, but they become noticeable after the TCC has locked when going up a hill or accelerating.

Refer to Symptoms - Engine Controls , for the 2.8L, 3.0L, 3.2L, 3.6L engines or Symptoms - Engine Controls for the 2.0L or 2.5L engines in order to avoid misdiagnosis of TCC shudder and the unnecessary disassembly of a transmission or the unnecessary replacement of a torque converter.

Torque Converter Vibration Test

Note. The Noise and Vibration Analysis procedure should be performed prior to performing this test.

Isolating Vibration

Note. Some engine/transmission combinations cannot be balanced in this manner due to restricted access or limited clearances between the torque converter bolts and the engine.

To isolate and correct a flexplate or torque converter vibration

  1. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration.
  2. Turn the engine OFF.
  3. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/ats/i-2012-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
  4. Remove the torque converter access cover and the bolts (if equipped).
  5. Mark the relationship of the torque converter to the flexplate.
  6. Rotate the torque converter to inspect for defects or missing balance weights.
  7. Index the converter according to "Indexing Torque Converter" procedure located within this procedure.
  8. If the vibration remains, it is most likely caused by the engine.
  9. Refer to "Torque Converter Replacement Guide" located within this procedure.

Indexing Torque Converter

To determine and correct a torque converter vibration, the following procedure may have to be performed several times to achieve the best possible torque converter to flexplate balance.

  1. Remove the torque converter bolts.
  2. Rotate the torque converter one bolt position from the original marked position.
  3. Align the torque converter pilot (2) in the engine crankshaft (3). Install the torque converter to flexplate bolts, and tighten according to «Fastener Tightening Specifications (Off Vehicle)»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__fastener-tightening-specifications-off-vehicle) , «Fastener Tightening Specifications (On Vehicle)»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__fastener-tightening-specifications-on-vehicle) .
  4. Lower the vehicle.
  5. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration. Repeat this procedure until the best possible balance is obtained.
  6. Install the torque converter access cover and bolts (if equipped) and tighten according to «Fastener Tightening Specifications (Off Vehicle)»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__fastener-tightening-specifications-off-vehicle) , «Fastener Tightening Specifications (On Vehicle)»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-specifications__fastener-tightening-specifications-on-vehicle) .
ConditionAction
Transmission Fluid Oxidized/Discolored Clutch Fiber MaterialDo not replace the torque converter. Refer to Transmission Fluid Level and Condition Check .
Transmission Fluid Contaminated with Metal ParticlesNOTE: Do not replace the torque converter for clutch system or gearset component damage. Fine metallic debris or clutch plate material that is suspended in the fluid will not cause damage to the internal torque converter components nor any internal transmission components.
Harsh Gear ShiftsDo not replace the torque converter. Refer to Symptoms - Automatic Transmission .
Noise - WhineRefer to Symptoms - Automatic Transmission . Do not replace the torque converter if noise is present in Neutral/Park. Refer to Symptoms - Engine Mechanical , for the 2.8L, 3.0L, 3.2L, 3.6L engines or Symptoms - Engine Mechanical (LCV) , Symptoms - Engine Mechanical (LTG) for the 2.0L or 2.5L engines.
Vibration - Out of BalanceRefer to Torque Converter Vibration Test in this procedure.
No Drive/Slips in DriveDo not replace the torque converter until completing all engine and transmission diagnostics.
Idle Surge/Rough IdleDo not replace the torque converter. Refer to Symptoms - Engine Controls , for the 2.8L, 3.0L, 3.2L, 3.6L engines or Symptoms - Engine Controls for the 2.0L or 2.5L engines.
TCC Apply/Release ShudderDo not replace the torque converter. Refer to Torque Converter Clutch Shudder in this procedure.
TCC ChuggleDo not replace the torque converter. Refer to Symptoms - Engine Controls , for the 2.8L, 3.0L, 3.2L, 3.6L engines or Symptoms - Engine Controls for the 2.0L or 2.5L engines.
DTC P0741 - TCC Stuck OFF/High Slip - Intermittent OnlyDo not replace the torque converter. Refer to DTC P0741 or P0742 diagnostic table.
DTC P0741 - TCC Stuck OFF/High SlipDo not replace the torque converter. Refer to DTC P0741 or P0742 diagnostic table.
DTC P0742 - TCC Stuck ONDo not replace the torque converter. Refer to DTC P0741 or P0742 diagnostic table.
Transmission Fluid Contaminated with Sludge/Metal Particles as a result of: Engine Coolant/Oil Pump damage Drive sprocket support damage Turbine/stator shaft damage Internal converter damage with no damage found in the transmissionReplace the torque converter.
Poor Acceleration above 48 km/h (30 mph) - Good LaunchDo not replace the torque converter until completing all engine and transmission diagnostics. Refer to Torque Converter Stator in this procedure. Refer to Symptoms - Engine Controls , for the 2.8L, 3.0L, 3.2L, 3.6L engines or Symptoms - Engine Controls for the 2.0L or 2.5L engines.
Poor Launch - Good Acceleration above 48 km/h (30 mph)Do not replace the torque converter until completing all engine and transmission diagnostics. Refer to Torque Converter Stator in this procedure. Refer to Symptoms - Engine Controls , for the 2.8L, 3.0L, 3.2L, 3.6L engines or Symptoms - Engine Controls for the 2.0L or 2.5L engines.
Stripped Converter Bolt HolesReplace the torque converter. Inspect flexplate and refer to Lower Engine Noise, Regardless of Engine Speed , for the 2.8L, 3.0L, 3.2L, 3.6L engines or Lower Engine Noise, Regardless of Engine Speed for the 2.0L or 2.5L engines.
Torque Converter Pilot DamagedReplace the torque converter.
Torque Converter Hub surface is damaged - scored, raised/transferred metalReplace the torque converter.
External Leaks in the weld areas - hub, lug or closure weldReplace the torque converter.
Broken/Cracked FlexplateReplace the torque converter.
Torque Converter Discolored/OverheatedReplace the torque converter.
NOTE
Do not replace the torque converter for clutch system or gearset component damage. Fine metallic debris or clutch plate material that is suspended in the fluid will not cause damage to the internal torque converter components nor any internal transmission components.

Torque Converter Replacement Guide

CAUTIONSome engine/transaxle combinations cannot be balanced in this manner due to restricted access or limited clearances between the torque converter bolts and the engine. Ensure that the bolts do not bottom out in the lug nuts or the torque converter cover which could dent and cause internal damage.

To isolate and correct a flywheel or torque converter vibration, separate the torque converter from the flywheel to determine if vibration is in the engine or transmission.

  1. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration.
  2. Turn the engine OFF.
  3. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/ats/i-2012-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
  4. Remove the transmission converter cover bolts and the cover.
  5. Mark the relationship of the converter to the flywheel.
  6. Remove the bolts attaching the converter to the flywheel.
  7. Slide the torque converter away from the flywheel.
  8. Rotate the flywheel and torque converter to inspect for defects or missing balance weights.
  9. Lower the vehicle.
  10. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration. Refer to «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .
  11. Turn the engine OFF.

To determine and correct a torque converter vibration, the following procedure may have to be performed several times to achieve the best possible torque converter to flywheel balance.

  1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/ats/i-2012-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
  2. Rotate the torque converter one bolt position.
  3. Align the torque converter hub (2) in the engine crankshaft (3) and install the torque converter to flywheel bolts.
  4. Lower the vehicle.
  5. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration. Refer to «Noise and Vibration Analysis»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__noise-and-vibration-analysis) . Repeat this procedure until you obtain the best possible balance.
  6. Install the transmission converter cover bolts and the cover.

Bushing and Mating Shaft Inspection

Note. Proper bushing and corresponding mating shaft inspection should be performed before replacing the bushing, shaft, and in some cases, the component which houses the bushing. Thoroughly clean and dry the bushing and shaft surfaces before inspecting for damage.

Any of the following bushing conditions require replacement of the bushing and/or housing

  1. Discoloration due to heat distress
  2. Misalignment or displacement of bushing as a result of spinning in housing
  3. Medium to heavy scoring that can be easily detected with fingernail. Light scoring is a normal condition.
  4. Debris embedded into the bushing lining material
  5. Obvious damage, including excessive and uneven wear
  6. Excessive polishing. Minor polishing of the bushing is an indication of normal wear and does not require replacement.

Any of the following conditions require replacement of the bushing's mating shaft

  1. Discoloration due to heat distress
  2. Rough surface finish that can be easily detected with finger
  3. Obvious shaft abnormalities, including warping or uneven surfaces
  4. Obvious damage or cracking

Vibration

ChecksCauses
Lug bolts for the Torque Converter (1)Inspect for loose torque converter (1) lug bolts.
Input Sun Gear Thrust Washer (55)Inspect for wear or damage.
Turbine Shaft Thrust Bearing Assembly (57)Inspect for wear or damage.
2-6 and 3-5-R Clutch Hub Thrust Bearing Assembly (65)Inspect the bearing for wear or damage.
Output Carrier Assembly (68)Inspect the carrier assembly for damaged pinion gears, thrush washers, pins, and rollers. Inspect for a worn or damaged center support roller bearing assembly (485). Inspect for damaged thrust bearings (486, 488). Inspect the carrier assembly for damaged output carrier rear sun gear thrust bearing (captured).
Output Carrier Thrust Bearing Assembly (69)Inspect the bearing for wear or damage.
Output Shaft Thrust Bearing Assembly (71)Inspect the bearing for wear or damage.
1-2-3-4 Clutch Hub Thrust Bearing Assembly (63)Inspect the bearing for wear or damage.
Turbine Shaft Thrust Bearing Assembly (57)Inspect the bearing for wear or damage.
Clutch Select Solenoid Valve Spring (353)Inspect for broken spring within the lower valve body in the torque converter clutch regulator apply valve line up (355).

Vibration

Noise and Vibration Analysis

A noise or vibration that is noticeable when the vehicle is in motion MAY NOT be the result of the transmission.

If noise or vibration is noticeable in PARK and NEUTRAL with the engine at idle, but is less noticeable as RPM increases, the cause may be from poor engine performance.

  1. Vibration may also be caused by a small amount of water inside the converter.
  2. Inspect the tires for the following conditions: Uneven wear Imbalance Mixed sizes Mixed radial and bias ply
  3. Inspect the suspension components for the following conditions: Alignment wear or damage Loose fasteners Driveline damage or wear
  4. Inspect the engine and transmission mounts for damage and loose bolts.
  5. Inspect the transmission case mounting holes for the following conditions: Missing bolts, nuts, and studs Stripped threads Cracks
  6. Inspect the flywheel for the following conditions: Missing or loose bolts Cracks Imbalance
  7. Inspect the torque converter for the following conditions: Missing or loose bolts or lugs Missing or loose balance weights Imbalance caused by heat distortion or fluid contamination

Whine/Growl Noise That Changes with Vehicle Speed

ChecksCauses
2-6 and 3-5-R Clutch Hub Thrust Bearing Assembly (65)Inspect the bearing for wear or damage.
Output Carrier Assembly (68)Inspect the carrier assembly for damaged pinion gears, thrust washers, pins, and rollers. Inspect for a damaged center support roller bearing assembly (485). Inspect for damaged thrust bearings (486, 488). Inspect for damaged sun gears (487, 489). Inspect the carrier assembly for damaged output carrier rear sun gear thrust bearing (captured). Inspect for damaged or stripped splines on the output carrier assembly.
Output Carrier Thrust Bearing Assembly (69)Inspect the bearing for wear or damage.
Output Shaft Assembly (70)Inspect for damaged internal gears (495, 497). Inspect the output carrier bushing (498) for damage or wear.
Output Shaft Thrust Bearing Assembly (71)Inspect the bearing for wear or damage.
Input Sun Gear Thrust Washer (55)Inspect the washer for wear or damage.
Input Sun Gear Thrust Bearing (54)Inspect the bearing for wear or damage.
Input Sun Gear (53)Inspect for spline wear or damage.
Input Carrier Assembly (52)Inspect the carrier assembly for damaged pinion gears, thrust washers, pins, and rollers.
1-2-3-4 Clutch Hub Thrust Bearing Assembly (63)Inspect the bearing for wear or damage.
2-6 and 3-5-R Clutch (with Output Carrier Outer Sun Gear Shaft) Hub Assembly (64)Inspect the output carrier inner sun gear shaft bushings (60 and 62) for damage or wear.
Turbine Shaft Thrust Bearing Assembly (57)Inspect the bearing for wear or damage.
Fluid Filter Assembly (26)Inspect for damaged or restricted fluid filter assembly (26) Inspect for damaged fluid filter seal assembly (25) or improper sealing interface (leaks, fluid aeration).
Automatic Transmission Fluid Pump Seal (5)Inspect for worn or damaged seal.

Whine/Growl Noise That Changes with Vehicle Speed

Noise in First or Reverse Gear

ChecksCauses
Center Support with 2-6 Low and Reverse Clutch Assembly (67)Inspect for damaged or worn low and reverse clutch plates (463-465). Inspect for damaged low and reverse clutch backing plate (462). Inspect for worn splines on backing plate. Inspect for damaged low and reverse clutch backing plate retaining ring (461). Inspect for damaged low and reverse clutch piston assembly (470), spring (469), spring retaining ring (466), and center support assembly (459). Inspect for damaged low clutch sprag assembly (467). Holding the sprag assembly with the retaining ring facing up, and the inner race of the sprag assembly fixed, the outer race should freewheel counterclockwise. Inspect for cut, worn, or damaged low clutch sprag seal (468).
Output Carrier Assembly (68)Inspect for damaged or stripped splines on the output carrier assembly.

Noise in First or Reverse Gear

Noise in First, Second, Third, Fourth, Fifth, or Reverse Gear

ChecksCauses
Input Carrier Assembly (52)Inspect thrust washers, pinion gears, and pins for wear or damage.
Input Sun Gear (53)Inspect for damaged sun gear.
1-2-3-4 and 3-5-R Clutch Assembly (51)Inspect for worn or damaged clutch bearing (428).

Noise in First, Second, Third, Fourth, Fifth, or Reverse Gear

Noise in First, Second, Sixth, or Reverse Gear

ChecksCauses
Center Support with 2-6 Low and Reverse Clutch Assembly (67)Inspect for worn or damaged output carrier outer sun gear shaft front and rear bushings (458 and 460).
Output Carrier Assembly (68)Inspect for a worn or damaged center support roller bearing assembly (485).

Noise in First, Second, Sixth, or Reverse Gear

Noise in Second or Sixth Gear

ChecksCauses
Center Support with 2-6 Low and Reverse Clutch Assembly (67)Inspect for damaged or worn output carrier outer sun gear shaft front bushing (458). Inspect for damaged or worn output carrier outer sun gear shaft rear bushing (460). Inspect for damaged 2-6 clutch backing plate (451). Inspect for worn splines on backing plate. Inspect for damaged 2-6 clutch backing plate retaining ring (450). Inspect for damaged 2-6 clutch piston assembly (457), spring (456), retaining ring (455), and center support assembly (459).

Noise in Second or Sixth Gear

Noise During 3-4 or 4-3 Shifts

ChecksCauses
4-5-6 Clutch (with Output Carrier Shaft and Dampener) Hub Assembly (58)Inspect hub assembly (475), dampener (476), and apply plate (477) for wear or damage. Inspect for damaged or worn 4-5-6 clutch backing plate (432).

Noise During 3-4 or 4-3 Shifts

Noise in Fourth, Fifth, or Sixth Gear

ChecksCauses
Input Sun Gear Thrust Washer (55)Inspect for wear or damage.
Turbine Shaft Thrust Bearing Assembly (57)Inspect for wear or damage.
4-5-6 Clutch (with Output Carrier Shaft and Dampener) Hub Assembly (58)Inspect for damaged or worn 4-5-6 clutch backing plate (432). Inspect for improper selective 4-5-6 clutch backing plate retaining ring (431).

Noise in Fourth, Fifth, or Sixth Gear

Composition Plates

Dry the plates and inspect the plates for the following conditions

  1. Pitting
  2. Flaking
  3. Delamination-splitting or separation of bonded clutch material
  4. Wear
  5. Glazing
  6. Cracking
  7. Charring
  8. Chips or metal particles embedded in the lining

Replace a composition plate which shows any of these conditions.

Steel Plates

Wipe the plates dry and check the plates for heat discoloration. If the surfaces are smooth, even if color smear is indicated, you can reuse the plate. If the plate is discolored with heat spots or if the surface is scuffed, replace the plate.

Causes of Burned Clutch Plates

The following conditions can result in a burned clutch plate

  1. Incorrect usage of clutch or apply plates
  2. Engine coolant or water in the transmission fluid
  3. A cracked clutch piston
  4. Damaged or missing seals
  5. Low line pressure
  6. Valve body conditions The valve body face is not flat. Porosity is between channels. The valve bushing clips are improperly installed. The checkballs are misplaced.
  7. The Teflon® seal rings are worn or damaged.

Engine Coolant/Water in Transmission

CAUTIONThe antifreeze or water will deteriorate the seals, gaskets and the glue that bonds the clutch material to the pressure plate. Both conditions may cause damage to the transmission.

If antifreeze or water has entered the transmission, perform the following

  1. Disassemble the transmission.
  2. Replace all of the rubber type seals. The coolant will attack the seal material which will cause leakage.
  3. Replace the composition-faced clutch plate assemblies. The facing material may separate from the steel center portion.
  4. Replace all of the nylon parts - washers.
  5. Replace the torque converter.
  6. Thoroughly clean and rebuild the transmission, using new gaskets and oil filter.
  7. Flush the cooler lines after the transmission cooler has been properly repaired or replaced.

General Method

  1. Verify that the leak is transmission fluid.
  2. Thoroughly clean the suspected leak area using a rag.
  3. Operate the vehicle for 15-20 minutes under city driving conditions until normal operating temperatures are reached.
  4. Park the vehicle over clean paper or cardboard.
  5. Shut OFF the engine.
  6. Look for fluid spots on the paper.
  7. Make the necessary repairs.

Powder Method

  1. Thoroughly clean the suspected leak area using a rag.
  2. Apply an aerosol type powder, such as foot powder, to the suspected leak area.
  3. Operate the vehicle for 15-20 minutes under city driving conditions until normal operating temperatures are reached.
  4. Shut OFF the engine.
  5. Inspect the suspected leak area.
  6. Trace the leak path through the powder in order to find the source of the leak.
  7. Make the necessary repairs.

Dye and Black Light Method

A fluid dye and black light kit is available from various tool manufacturers.

  1. Follow the manufacturer's instructions in order to determine the amount of dye to use.
  2. Detect the leak with the black light.
  3. Make the necessary repairs.

Find the Cause of the Leak

Pinpoint the leak and trace the leak back to the source. You must determine the cause of the leak in order to repair the leak properly. For example, if you replace a gasket, but the sealing flange is bent, the new gasket will not repair the leak. You must also repair the bent flange. Before you attempt to repair a leak, check for the following conditions, and make repairs as necessary

Gaskets

  1. Fluid level/pressure is too high
  2. Plugged vent or drain-back holes
  3. Improperly tightened fasteners
  4. Dirty or damaged threads
  5. Warped flanges or sealing surface
  6. Scratches, burrs, or other damage to the sealing surface
  7. Damaged or worn gasket
  8. Cracking or porosity of the component
  9. Improper sealant used, where applicable
  10. Incorrect gasket

Seals

  1. Fluid level/pressure is too high
  2. Plugged vent or drain-back holes
  3. Damaged seal bore
  4. Damaged or worn seal
  5. Improper installation
  6. Cracks in component
  7. Manual or output shaft surface is scratched, nicked, or damaged
  8. Loose or worn bearing causing excess seal wear

Possible Points of Fluid Leaks

Transmission Oil Pan

  1. Incorrectly tightened oil pan bolts
  2. Improperly installed or damaged oil pan gasket
  3. Damaged oil pan or mounting face
  4. Incorrect oil pan gasket

Case Leak

  1. Damaged vehicle speed sensor seal
  2. Damaged manual shaft seal
  3. Loose or damaged oil cooler connector fittings
  4. Worn or damaged propeller shaft oil seal
  5. Loose line pressure pipe plug
  6. Porous casting warped torque converter housing

Leak at the Torque Converter End

  1. Converter leak in the weld area
  2. Converter seal lip cut. Check the converter hub for damage
  3. Converter seal bushing moved forward and damaged
  4. Converter seal garter spring missing from the seal
  5. Porous casting of the transmission case or the oil pump

Leak at the Vent Pipe

  1. Overfilled system
  2. Water or coolant in the fluid; The fluid will appear milky
  3. Transmission case porous
  4. Incorrect fluid level indicator
  5. Plugged vent
  6. Drain-back holes plugged
  7. Mispositioned oil pump to case gasket, if equipped

Scheme 37

Scheme 37: Leak Inspection Points
Scheme 37: Leak Inspection Points
CalloutComponent Name
1Automatic Transmission Electrical Connector Passage Sleeve
2Line Pressure Test Hole Plug
3Converter Housing to Case Joint
4Trans Fluid Cooler Pipe Fitting Seals
5Manual Shift Shaft Seal
6Automatic Transmission Vent Pipe
7Transmission Case Assembly
8A/Trans Case Extension Seal - 2WD Model Only
9A/Trans Fluid Pan Gasket
10Torque Converter Fluid Seal Assembly
11Torque Converter Assembly
12Case Extension to Case Joint

Case Porosity Repair

Some external leaks are caused by case porosity in non-pressurized areas. You can usually repair these leaks with the transmission in the vehicle.

  1. Thoroughly clean the area to be repaired with a cleaning solvent. Air dry the area.
  2. Using instructions from the manufacturer, mix a sufficient amount of an epoxy to make the repair.
  3. While the transmission case is still hot, apply the epoxy. You can use a clean, dry soldering acid brush to clean the area and also to apply the epoxy cement. Make certain that the area to be repaired is fully covered.
  4. Allow the epoxy cement to cure for three hours before starting the engine.
  5. Repeat the fluid leak diagnosis procedures.

Transmission Fluid Cooler Flushing and Flow Test

GM studies indicate that plugged or restricted transmission oil coolers and pipes cause insufficient transmission lubrication and elevated operating temperatures which can lead to premature transmission failure. Many repeat repair cases could have been prevented by following published procedures for transmission oil cooler flushing and flow checking. This procedure includes flow checking and flushing the auxiliary transmission oil cooler, if equipped.

Note. Use the DT-45096 transmission oil cooling system flush and flow test tool or equivalent to flush and flow test the transmission oil cooler and the oil cooler pipes after the transmission is removed for repairs.

Only use the appropriate GM automatic transmission fluid when doing a repair on a GM transmission.

If the fluid in the DT-45096 transmission oil cooling system flush and flow test tool is different than what is used in the transmission, use compressed air to blow the residual transmission fluid out of the oil cooler and lines.

Time allowance for performing the cooler flow checking and flushing procedure has been included in the appropriate labor time guide operations since the 1987 model year. The service procedure steps for oil cooler flushing and flow testing are as follows

Cooler Flow Check and Flushing Steps

  1. Machine Set-up
  2. Determine Minimum Flow Rate
  3. Back Flush
  4. Forward Flush
  5. Flow Test
  6. Code Recording Procedure
  7. Clean-up

Special Tools

  1. DT-45096 Transmission Oil Cooling System Flush and Flow Test Tool
  2. DT-45096-30 Transmission Cooler Flush Adapter
  3. J-35944-200A Cooler Flushing Adapter
  4. Shop air supply with water/oil filters, regulator and pressure gauge - minimum 90 psi
  5. Eye protection
  6. Rubber gloves

For equivalent regional tools, refer to Special Tools .

Machine Set-up

  1. Verify that the main power switch (1) is in the OFF position.
  2. Place the main function switch (2) in the IDLE position.
  3. Connect DT-45096 transmission oil cooling system flush and flow test tool to the vehicle 12V DC power source by connecting the red battery clip to the positive, +, battery post on the vehicle and connect the negative lead to a known good chassis ground.
  4. Turn the main power switch to the ON position.
  5. Fill the supply tank with the appropriate GM automatic transmission fluid through the fill port.
  6. Reinstall and tighten the fill cap.
  7. Connect a shop air supply hose to the quick-disconnect on the rear panel marked SUPPLY AIR.

Determine Minimum Flow Rate

  1. From the machine display, identify the temperature of the automatic transmission fluid that is stored in the supply vessel of DT-45096 flush and flow test tool.
  2. Determine whether the transmission oil cooler is steel or aluminum by using a magnet (1) at the cooler flange (2) at the radiator.
  3. Refer to the table below. Using the temperature from step 1, locate on either the Steel MINIMUM Flow Rate table or the Aluminum MINIMUM Flow Rate table the minimum flow rate in gallons per minutes (GPM). Record the minimum flow rate in GPMs and the supply fluid temperature for further reference. Example Fluid temperature: 75°F Cooler type: Steel The MINIMUM flow rate for this example would be 0.8 GPM.
  4. Inspect transmission oil cooler lines for damage or kinks that could cause restricted oil flow. Repair as needed and refer to the appropriate GM service manual procedures.
Temperature RangeSteelAluminum
65 - 66°F0.6 gpm0.5 gpm
67 - 70°F0.7 gpm0.6 gpm
71 - 75°F0.8 gpm0.7 gpm
76 - 80°F0.9 gpm0.8 gpm
81 - 84°F1.0 gpm0.9 gpm
85 - 89°F1.1 gpm1.0 gpm
90 - 94°F1.2 gpm1.1 gpm
95 - 98°F1.3 gpm1.2 gpm
99 - 103°F1.4 gpm1.3 gpm
104 - 108°F1.5 gpm1.4 gpm
109 - 112°F1.6 gpm1.5 gpm
113 - 117°F1.7 gpm1.6 gpm
118 - 120°F1.8 gpm1.7 gpm

Minimum Flow Rate in Gallons Per Minute (gpm)

Back Flush Procedure

  1. If equipped with bypass valve, disconnect the oil cooler lines from the bypass valve.
  2. If equipped with bypass valve, connect the J-35944-200A cooler flushing adapter (1) to the vehicle transmission oil cooler supply and return lines at the transmission.
  3. 3. If not equipped with the bypass valve, connect the DT-45096-30 cooler flush adapter (1) to the vehicle transmission oil cooler supply and return lines at the transmission.
  4. Connect the black supply hose (1) to the return line, bottom connector of the transmission, and the clear waste hose (2) to the feed line, top connector of the transmission, to the vehicle cooler lines. This is the reverse flow - backflush direction.
  5. Turn the main function switch to the FLUSH position. Allow the machine to operate for 30 seconds.
  6. Turn the main function switch to the IDLE position and allow the supply vessel pressure to dissipate.

Forward Flush

  1. Disconnect the supply and waste hoses from the vehicle cooler lines. Reverse the supply hose (2) and waste hose (1) to provide a normal flow direction.
  2. Turn the main function switch to the FLUSH position and allow machine to operate for 30 seconds.

Flow Test

  1. Turn the main function switch to the FLOW position and allow the oil to flow for 15 seconds. Observe and note the flow rate; this is the TESTED flow rate.
  2. Compare the TESTED flow rate to the MINIMUM flow rate information previously recorded. If the TESTED flow rate is equal to or greater than the MINIMUM flow rate recorded, the oil cooling system is functioning properly. Perform Code Recording Procedure. If the TESTED flow rate is less than the MINIMUM flow rate previously recorded, repeat the back flush and forward flush procedures.
  3. If the TESTED flow rate is less than the MINIMUM flow rate after the second test, perform Code Recording Procedure. Replace the transmission oil cooler. Reconnect supply and waste hoses to the cooler lines in the normal flow direction. Perform Flow Test. Perform Code Recording Procedure.

Code Recording Procedure

  1. Turn the main function switch to the CODE position.
  2. Record TESTED flow rate, temperature, cycle and seven-character flow code information on repair order.

Clean-up

  1. Turn the main function switch (2) to the IDLE position and allow the supply vessel pressure to dissipate.
  2. Turn the main power switch (1) to the OFF position.
  3. Disconnect the supply and waste hoses and the 12-volt power source from the vehicle.
  4. Disconnect the air supply hose from DT-45096 flush and flow test tool.
  5. Remove the DT-45096-30 or the J-35944-200A adapters.
  6. Dispose of the waste automatic transmission fluid in accordance with all applicable federal, state, and local requirements.

Automatic Transmission Fluid Leaks

ChecksCauses
Torque Converter (1)Inspect for damage, cracks at the lug, hub and seal welds.
Torque Converter Housing (203)Verify leak is ATF and not oil from rear of engine. Inspect for housing porosity or damage. Inspect for worn or damaged torque converter seal (201). Inspect for loose line pressure plug. Inspect cooler line attachment for loose bolt, worn or damaged seal, or leak at line to boss joint. Inspect vent pipe attachment to housing and hose. Verify torque of housing to case bolts.
Automatic Transmission Fluid Pump Seal (5)Inspect for cut, wear, or damage.
Case AssemblyInspect for porosity or damage. Inspect manual shaft seal. Inspect control wiring input sleeve seals. Inspect rear case plugs (12) (4WD/AWD only, 4WD may also be cast over).
Extension AssemblyVerify oil is from transmission and not transfer case assembly (4WD/AWD). Inspect extension seal assembly (inner seal behind boot - 2WD only). Inspect extension to case seal (2WD only).
Pan AssemblyInspect the pan assembly for damage. Inspect gasket for damage or wear. Inspect case and pan for damage and flatness at gasket interface area.
Cooler Lines/CoolersInspect and follow cooler lines to front radiator and external coolers. Some vehicles may have rear differential external and internal coolers.

Automatic Transmission Fluid Leaks

Shift Indicator Indicates Wrong Gear Selection

ChecksCauses
Shift CableInspect for damage. Verify proper attachment to shifter. Verify cable is locked into shifter bracket. Verify cable is properly attached to the transmission. Verify that the cable is locked into the transmission bracket. Verify proper shift cable adjustment.
Manual ShaftVerify shift lever is properly attached to the manual shaft. Verify manual shaft is not twisted or damaged.
Manual Shift Detent Lever with Shaft Position Switch Assembly, IMSVerify proper operation. Refer to Transmission Internal Mode Switch Logic .

Shift Indicator Indicates Wrong Gear Selection

No Park or Drive

ChecksCauses
Output Shaft Assembly (70)Inspect for a broken or damaged output shaft. Inspect for worn splines.
Case AssemblyInspect for broken or damaged case. Inspect for broken or bent park pawl actuator. Inspect for broken or missing park pawl actuator guide pin or manual shaft pin. Inspect for broken, loose or misaligned park pawl guide. Inspect for binding or broken park pawl or actuator assembly.
Manual Shift Detent Lever Assembly (511)Inspect for broken or disengaged manual valve detent.

No Park or Drive

Harsh Garage Shift

ChecksCauses
NOTE: On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.
EngineElevated engine RPM - Verify correct engine operating rpm per application.
A/Trans Fluid Pump Cover Assembly (219)Inspect for damaged, stuck, sticky pressure regulator valve (233) and springs (234 and 235). Inspect for damaged, stuck, sticky isolator valve (236) and sleeve (237).
Control Solenoid (w/Body and TCM) Valve Assembly (314)Incorrect or inadequate adapt activity - Perform Reset Transmission Adapts procedure. Incorrect TCM temperature reporting - Monitor TCM temperature using Tech 2. Line pressure control solenoid incorrect pressure.
1-2-3-4 and 3-5-R Clutch Assembly (51)Inspect for damaged 1-2-3-4 clutch piston (414), piston housing (417), spring (413), and dam assembly (412). Inspect for cut, worn, or damaged 1-2-3-4 clutch piston seal (416), inner seal (423), and housing seals (424 and 425). Inspect for improper selective 1-2-3-4 clutch backing plate retaining ring (429). Inspect for damaged 3-5-R clutch piston (421), apply ring (405), and spring (420). Inspect for cut, worn, or damaged 3-5-R clutch piston dam O-ring seal (418), inner seal (419), and outer seal (422). Inspect for improper selective 3-5-R clutch backing plate retaining ring (400).
NOTE
On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.

Harsh Garage Shift

No Drive in All Ranges

ChecksCauses
A/Trans Fluid Pan Assembly (29)Verify proper fluid level and condition, inspect transmission assembly for leaks.
Torque Converter (with Fluid Pump) Housing Assembly (2)Inspect for damaged or scored pump housing (203), cover (219), rotor (217), slide (212), and vanes (216).
Fluid Filter Assembly (26)Inspect for damaged or restricted fluid filter assembly (26). Inspect for damaged fluid filter seal assembly (25) or improper sealing interface, leaks, and fluid aeration.
Automatic Transmission Fluid Pump Seal (5)Inspect for worn or damaged seal.
A/Trans Cooling/Lubrication SystemInspect transmission oil cooler (radiator) and cooler line seals for restrictions, damage, kinks, or leaks.
Torque Converter Assembly (1)Inspect for overheating (blued), ballooning, leaks, or other damage.
1-2-3-4 and 3-5-R Clutch Assembly (51)Inspect clutch pack retaining rings (400 and 429) for proper installation. Inspect housing and clutch pistons and seals for damage or leaks.
Control Valve Lower Body Assembly (351)Inspect for stuck, sticky or damaged clutch select valve (352).
Manual Valve (354)Inspect the manual valve detent lever assembly (505) and connection to the manual valve (354).
A/Trans Manual Shift Shaft Position Switch Assembly (308)Inspect the switch assembly (308) and connection to the manual valve (354).
A/Trans Manual Shift Shaft Position Switch Assembly (308)Inspect PRNDL commands to and from vehicle using Tech 2.
Control Solenoid (w/Body and TCM) Valve Assembly (314)Inspect PRNDL commands to and from vehicle using Tech 2.
A/Trans Fluid Pump (Transfer) Seal Assembly (19)Inspect for damage or leaks.
Output Shaft Assembly (499)Inspect for spline wear or damage.
Output Carrier Assembly (490)Inspect the carrier assembly for damaged pinion gears, thrust washers, pins, and rollers. Inspect for damaged thrust bearings (486 and 488). Inspect for damaged sun gears (487 and 489). Inspect the carrier assembly for damaged output carrier rear sun gear thrust bearing (captured).
Low Clutch Sprag Assembly (467)Inspect for excessive wear or damage.
Input Carrier Assembly (52)Inspect carrier assembly for damaged pinion gears, thrust washers, pins, and rollers.
Input Sun Gear (53)Inspect for spline wear or damage.

No Drive in All Ranges

No First Gear

ChecksCauses
A/Trans Fluid Pan Assembly (29)Verify proper fluid level and condition, inspect transmission assembly for leaks.
Center (with 2-6 Low and Reverse Clutch) Support Assembly (67)Inspect for damaged low clutch sprag assembly (467). Holding the sprag assembly with the retaining ring facing up, and the inner race of the sprag assembly fixed, the outer race should freewheel counterclockwise. Inspect for damaged low and reverse clutch piston assembly (470), spring (469), spring retaining ring (466), and center support assembly (459). Inspect for damaged or worn low and reverse clutch plates (463-465). Inspect for damaged low and reverse clutch backing plate retaining ring (461). Inspect for cut, worn, or damaged low clutch sprag seal (468).
Control Valve Upper Body Assembly (304)Inspect for sticking, damaged, or worn 1st/Rev and 4-5-6 clutch regulator valve (327) and spring (326). Inspect for sticking, damaged, or worn #2 ball check valve. Inspect for sticking, damaged, or worn #3 ball check valve.
Control Valve Lower Body Assembly (307)Inspect for sticking, damaged, or worn clutch select valve 2 (352) and spring (353). Inspect for sticking, damaged, or worn clutch select valve 3 (352) and spring (353).
Center Support Fluid Passage Seal Assembly (20)Inspect for worn, cut, or damaged seals. Inspect for proper seal (20) size (6L45/50E MYA/MYB) vs (6L80/90E MYC/MYD).

No First Gear

No First and Reverse Gears

ChecksCauses
A/Trans Fluid Pan Assembly (29)Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304)Inspect for sticking, damaged, or worn 1st/rev and 4-5-6 clutch regulator valve (327) and spring (326).
Control Valve Lower Body Assembly (307)Inspect for sticking, damaged, or worn clutch select valve 3 (352) and spring (353).
Control Valve Lower Body Assembly (307)Inspect for sticking, damaged, or worn clutch select valve 2 (352) and spring (353).
Control Valve Upper Body Assembly (304)Inspect for sticking, damaged, or worn #2 ball check valve
Center (with 2-6 Low and Reverse Clutch) Support Assembly (67)Inspect for damaged low and reverse clutch piston assembly (470), spring (469), spring retaining ring (466), and center support assembly (459). Inspect for damaged or worn low and reverse clutch plates (463-465). Inspect for damage low and reverse clutch backing plate retaining ring (461). Inspect for damaged low clutch sprag assembly (467). Holding the sprag assembly with the retaining ring facing up, and the inner race of the sprag assembly fixed, the outer race should freewheel counterclockwise. Inspect for cut, worn, or damaged low clutch sprag seal (468).
Center Support Fluid Passage Seal Assembly (20)Inspect for worn, cut, or damaged seals. Inspect for proper seal (20) size (6L45/50E MYA/MYB) vs (6L80/90E MYC/MYD).

No First and Reverse Gears

Harsh, Soft, Delayed or Slipping First or Reverse Gear

ChecksCauses
NOTE: On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.
A/Trans Fluid Pan Assembly (29)Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304)Inspect for sticking, damaged, or worn 1-R/4-5-6 clutch regulator valve (327) and spring (326). Inspect for damaged or sticking #2 ball check valve.
Control Valve Lower Body Assembly (307)Inspect for sticking, damaged, or worn clutch select valve 3 (352) and spring (353).
Control Valve Lower Body Assembly (307)Inspect for sticking, damaged, or worn clutch select valve 2 (352) and spring (353).
Center (with 2-6 Low and Reverse Clutch) Support Assembly (67)Inspect for damaged low and reverse clutch piston assembly (470), spring (469), spring retaining ring (466), and center support assembly (459). Inspect for damaged or worn low and reverse clutch plates (463 and 465). Inspect for damaged low and reverse clutch backing plate retaining ring (461). Inspect for damaged low clutch sprag assembly (467). Holding the sprag assembly with the retaining ring facing up, and the inner race of the sprag assembly fixed, the outer race should freewheel counterclockwise. Inspect for cut, worn, or damaged low clutch sprag seal (468).
Control Solenoid (w/Body and TCM) Valve Assembly (314)Pressure control solenoid 3 commanded/failed HIGH (off) or leaking - Perform solenoid valve assembly function test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test . Incorrect or inadequate adapt activity - Perform Reset Transmission Adapts procedure.
A/Trans Fluid Pump Cover Assembly (219)Inspect for damaged, stuck, sticky pressure regulator valve (233) and spring (234 and 235). Inspect for damaged, stuck, sticky isolator valve (236) and sleeve (237).
Center Support Fluid Passage Seal Assembly (20).Inspect for worn, cut, or damaged seals. Inspect for proper seal (20) size (6L45/50E MYA/MYB) vs (6L80.90E MYC/MYD).
NOTE
On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.

Harsh, Soft, Delayed or Slipping First or Reverse Gear

No First, Second, Third, and Fourth Gear

ChecksCauses
A/Trans Fluid Pan Assembly (29)Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304)Inspect for sticking, damaged, or worn 1-2-3-4 clutch regulator valve (337) and spring (326).
Control Solenoid (w/Body and TCM) Valve Assembly (314)Inspect for contamination or debris. Pressure control solenoid 5 commanded/failed LOW (off) or leaking - Perform solenoid valve assembly function test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
1-2-3-4 and 3-5-R Clutch Assembly (51)Inspect clutch pack retaining ring (429) for proper installation. If the retaining ring is out of the groove the following parts must be replaced: 1-2-3-4 and 3-5-R clutch housing (427), 1-2-3-4 and 3-5-R clutch bearing assembly (428) and the 1-2-3-4 clutch backing plate retaining ring. Inspect for a cracked or damaged 1-2-3-4 clutch piston (414), piston housing (417), spring (413), and dam assembly (412). Inspect for cut, worn, or damaged 1-2-3-4 clutch piston seal (416), inner seal (423), and housing seals (424 and 425). Inspect for improper selective 1-2-3-4 clutch backing plate retaining ring (429).
Fluid Filter Assembly (26)Inspect for damaged or restricted fluid filter assembly (26). Inspect for damaged fluid filter seal assembly (25) or improper sealing interface, leaks, and fluid aeration.
Torque Converter (with Fluid Pump) Housing Assembly (2)Inspect for damaged or scored pump housing (203), cover (219), rotor (217), slide (212) and vanes (216).
Torque Converter (with Fluid Pump) Housing Assembly (2)Inspect for damaged or leaking 1-2-3-4 and 3-5-R clutch fluid seal rings (230).
Center (w/2-6 Low and Reverse Clutch) Support Assembly (67)Inspect for worn or damaged low clutch sprag assembly (467).
A/Trans Fluid Pump (Transfer) Seal Assembly (19)Inspect for damage or leaks.
1-2-3-4 Clutch (with Output Carrier Inner Sun Gear Shaft) Hub Assembly (61)Inspect for damaged splines on the hub assembly.

No First, Second, Third, and Fourth Gear

Harsh, Soft, Delayed or Slipping 1-2-3-4 Shift

ChecksCauses
NOTE: On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.
A/Trans Fluid Pan Assembly (29)Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304)Inspect for sticking, damaged, or worn 1-2-3-4 clutch regulator valve (337) and spring (326). Inspect for damaged or stuck #1 ball check valve.
Control Solenoid (w/Body and TCM) Valve Assembly (314)Inspect for contamination or debris. Pressure control solenoid 5 commanded/failed LOW (off) or leaking - Perform solenoid valve assembly function test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test . Incorrect or inadequate adapt activity - Perform Reset Transmission Adapts procedure. Line pressure control solenoid incorrect pressure.
1-2-3-4 and 3-5-R Clutch Assembly (51)Inspect for damaged 1-2-3-4 clutch piston (414), piston housing (417), spring (413), and dam assembly (412). Inspect for cut, worn, or damaged 1-2-3-4 clutch piston seal (416), inner seal (423), and housing seals (424 and 425). Inspect 3-5 reverse clutch housing for cracked weld. Inspect for improper selective 1-2-3-4 clutch backing plate retaining ring (429). Inspect for damaged 3-5-R clutch piston (421), apply ring (405), and spring (420). Inspect for cut, worn, or damaged 3-5-R clutch piston dam O-ring seal (418), inner seal (419), and outer seal (422). Inspect for improper selective 3-5-R clutch backing plate retaining ring (400).
Torque Converter (with Fluid Pump) Housing Assembly (2)Inspect for damaged or leaking 1-2-3-4 and 3-5-R clutch fluid seal rings (230).
A/Trans Fluid Pump Cover Assembly (219)Inspect for damaged, stuck, sticky pressure regulator valve (233) and springs (234 and 235). Inspect for damaged, stuck, sticky isolator valve (236) and sleeve (237).
Torque Converter (with Fluid Pump) Housing Assembly (2)Inspect for damaged or scored pump housing (203), cover (219), rotor (217), slide (212) and vanes (216).
Fluid Filter Assembly (26)Inspect for damaged or restricted fluid filter assembly (26). Inspect for damaged fluid filter seal assembly (25) or improper sealing interface, leaks, and fluid aeration.
A/Trans Fluid Pump (Transfer) Seal Assembly (19)Inspect for damage or leaks.
NOTE
On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.

Harsh, Soft, Delayed or Slipping 1-2-3-4 Shift

No Second and Sixth Gear

ChecksCauses
A/Trans Fluid Pan Assembly (29)Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304)Inspect for sticking, damaged, or worn 2-6 clutch regulator valve (334) and spring (326).
Control Solenoid (w/Body and TCM) Valve Assembly (314)Pressure control solenoid 4 commanded/failed LOW (off) or leaking - Perform solenoid valve assembly function test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
Center (with 2-6 Low and Reverse Clutch) Support Assembly (67)Inspect for proper installation of the 2-6 clutch return spring retaining ring (455). Inspect for damaged 2-6 clutch piston assembly (457), spring (456), retaining ring (455), and center support housing (459). Inspect for worn or damaged 2-6 clutch plates (451-453).
Center Support Fluid Passage Seal Assembly (20)Inspect for worn, cut, or damaged seals. Inspect for proper seal (20) size (6L45/50E MYA/MYB) vs (6L80/90E MYC/MYD).

No Second and Sixth Gear

Harsh, Soft, Delayed or Slipping Second or Sixth Gear

ChecksCauses
NOTE: On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.
A/Trans Fluid Pan Assembly (29)Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304)Inspect for sticking, damaged or worn 2-6 clutch regulator valve (334) and spring (326). Inspect for damaged or sticking #6 ball check valve.
Control Solenoid (w/Body and TCM) Valve Assembly (314)Pressure Control Solenoid 4 commanded/failed LOW (off) or leaking - Perform solenoid valve assembly function test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test . Incorrect or inadequate adapt activity - Perform Reset Transmission Adapts procedure.
Center (with 2-6 Low and Reverse Clutch) Support Assembly (67)Inspect for proper installation of the 2-6 clutch return spring retaining ring (455). Inspect for damaged 2-6 clutch piston assembly (457), spring (456), retaining ring (455), and center support assembly (459). Inspect for worn or damaged 2-6 clutch plates (451-453).
A/Trans Fluid Pump Cover Assembly (219)Inspect for damaged, stuck, sticky pressure regulator valve (233) and springs (234 and 235). Inspect for damaged, stuck, sticky isolator valve (236) and sleeve (237).
Center Support Fluid Passage Seal Assembly (20)Inspect for worn, cut, or damaged seals. Inspect for proper seal (20) size (6L45/50E MYA/MYB) vs (6L80/90E MYC/MYD).
NOTE
On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.

Harsh, Soft, Delayed or Slipping Second or Sixth Gear

No Third, Fifth, and Reverse Gear

ChecksCauses
A/Trans Fluid Pan Assembly (29)Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304)Inspect for sticking, damaged, or worn 3-5-R regulator valve (336) and valve spring (326). Inspect for damaged or stuck #7 ball check valve.
Control Valve Lower Body Assembly (307)Inspect for worn, damaged, or sticking clutch select solenoid valve 3 (352) and valve spring (353).
1-2-3-4 and 3-5-R Clutch Assembly (51)Inspect for proper installation of 3-5-R clutch backing plate retaining ring (400). Inspect for worn, damaged, or leaking clutch bearing seal assembly (428). Inspect for damaged or worn 3-5-R clutch plates (401-404). Inspect for damaged 3-5-R clutch piston (421), apply ring (405), and spring (420). Inspect for cut, worn, or damaged 3-5-R clutch piston dam O-ring seal (418), inner seal (419), and outer seal (422). Inspect for improper selective 3-5-R clutch backing plate retaining ring (400).
Control Solenoid (w/Body and TCM) Valve Assembly (314)Pressure control solenoid 2 commanded/failed HIGH (off) or leaking - Perform solenoid valve assembly function test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
A/Trans Fluid Pump (Transfer) Seal Assembly (19)Inspect for damage or leaks.

No Third, Fifth, and Reverse Gear

Harsh, Soft, Delayed or Slipping Third, Fifth, or Reverse Gear

ChecksCauses
NOTE: On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.
A/Trans Fluid Pan Assembly (29)Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304)Inspect for sticking, damaged, or worn 3-5-R regulator valve (336) and valve spring (326). Inspect for damaged or stuck #7 ball check valve.
Control Valve Lower Body Assembly (307)Inspect for worn, damaged, or sticking clutch select solenoid valve 3 (352) and valve spring (353).
Control Solenoid (w/Body and TCM) Valve Assembly (314)Pressure control solenoid 2 commanded/failed HIGH (off) or leaking - Perform solenoid valve assembly function test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test . Incorrect or inadequate adapt activity - Perform Reset Transmission Adapts procedure.
1-2-3-4 and 3-5-R Clutch Assembly (51)Inspect for proper installation of 3-5-R clutch backing plate retaining ring (400). Inspect for worn, damaged, or leaking clutch bearing seal assembly (428). Inspect for damaged or worn 3-5-R clutch plates (401-404). Inspect for damaged 3-5-R clutch piston (421), apply ring (405), and spring (420). Inspect 3-5 reverse clutch housing for cracked weld. Inspect for cut, worn, or damaged 3-5-R clutch piston dam O-ring seal (418), inner seal (419), and outer seal (422). Inspect for improper selective 3-5-R clutch backing plate retaining ring (400).
A/Trans Fluid Pump Cover Assembly (219)Inspect for damaged, stuck, sticky pressure regulator valve (233) and springs (234 and 235). Inspect for damaged, stuck, sticky isolator valve (236) and sleeve (237).
A/Trans Fluid Pump (Transfer) Seal Assembly (19)Inspect for damage or leaks.
NOTE
On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.

Harsh, Soft, Delayed or Slipping Third, Fifth, or Reverse Gear

No Fourth, Fifth, and Sixth Gear

ChecksCauses
A/Trans Fluid Pan Assembly (29)Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304)Inspect for sticking, damaged, or worn R-1/4-5-6 clutch regulator valve (327) and spring (326).
4-5-6 (with Turbine Shaft) Clutch Assembly (56)Inspect for cut, worn, or damaged turbine shaft fluid seal rings (442). Inspect for damaged piston (439), piston dam (437), dam retaining ring (436), and clutch spring (438). Inspect for worn or damaged 4-5-6 clutch plates (432-435). Inspect for damaged or leaking clutch housing (441). Inspect for improper selective 4-5-6 clutch backing plate retaining ring (431). Inspect for damaged or distorted turbine shaft.
A/Trans Fluid Pump Seal Assembly (18)Inspect for cut, leaking, or damaged seal.
4-5-6 Clutch (with Output Carrier Shaft and Dampener) Hub Assembly (58)Inspect the shaft for damage or wear. Inspect the hub assembly (475), dampener (476), and apply plate (477) for wear or damage.
A/Trans Cooling/Lubrication SystemInspect transmission oil cooler (radiator) and cooler lines/seals for restrictions, damage, kinks or leaks.
Control Solenoid (w/Body and TCM) Valve Assembly (314)Pressure control solenoid 3 commanded/failed HIGH (off) or leaking - Perform solenoid valve assembly function test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
Torque Converter (with Fluid Pump) Housing Assembly (2)Inspect for damaged or scored pump housing (203), cover (219), rotor (217), slide (212), and vanes (216). Inspect for damaged or porous pump cover assembly (219). Inspect pump surfaces for flatness. Inspect for excessive fluid pump rotor (217) clearance or damage. Ensure proper selective rotor is being utilized.
Output Shaft Assembly (70)Inspect for damaged or stripped splines on the output shaft.

No Fourth, Fifth, and Sixth Gear

Harsh, Soft, Delayed or Slipping 4-5-6 Shift

ChecksCauses
NOTE: On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.
A/Trans Fluid Pan Assembly (29)Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304)Inspect for sticking, damaged, or worn 1-R/4-5-6 clutch regulator valve (327) and spring (326). Inspect for damaged or sticking #3 and #4 ball check valves.
Control Valve Lower Body Assembly (307)Inspect for worn, damaged, or sticking clutch select solenoid valve 2 (352) and valve spring (353).
Control Solenoid (w/Body and TCM) Valve Assembly (314)Pressure Control Solenoid 3 commanded/failed HIGH (off) or leaking - Perform solenoid valve assembly function test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test . Incorrect or inadequate adapt activity - Perform Reset Transmission Adapts procedure.
4-5-6 (with Turbine Shaft) Clutch Assembly (56)Inspect for cut, worn, or damaged turbine shaft fluid seal rings (442). Inspect for damaged piston (439), piston dam (437), dam retaining ring (436), and clutch spring (438). Inspect for damaged or worn 4-5-6 clutch plates (432-435). Inspect for damage or leaking clutch housing (441). Inspect for improper selective 4-5-6 clutch backing plate retaining ring (431). Inspect for damaged or distorted turbine shaft.
A/Trans Fluid Pump Seal Assembly (18)Inspect for cut, leaking, or damaged seal.
4-5-6 Clutch (with Output Carrier Shaft and Dampener) Hub Assembly (58)Inspect shaft for damage or wear. Inspect hub assembly (475), dampener (476), and apply plate (477) for wear or damage.
A/Trans Fluid Pump Cover Assembly (219)Inspect for damaged, stuck, sticky pressure regulator valve (233) and springs (234 and 235). Inspect for damaged, stuck, sticky isolator valve (236) and sleeve (237).
NOTE
On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.

Harsh, Soft, Delayed or Slipping 4-5-6 Shift

No Torque Converter Clutch Apply

ChecksCauses
Torque Converter Assembly (1)Diagnose torque converter for possible internal damage. Refer to Torque Converter Diagnosis .
Fluid Pump Cover Assembly (219)Inspect for worn, damaged, or sticking converter feed limit valve (220) and spring (221). Inspect for worn, damaged, or sticking TCC control valve (227) and spring (226). Inspect for damaged stator shaft.
Control Valve Lower Body Assembly (307)Inspect for worn, damaged, or sticking torque converter clutch (TCC) regulator apply valve (355). Refer to Control Solenoid Valve and Transmission Control Module Assembly Inspection .
4-5-6 (with Turbine Shaft) Clutch Assembly (56)Inspect for damaged turbine shaft. Inspect for damaged turbine shaft O-ring seal.
Torque Converter (with Fluid Pump) Housing Assembly (2)Inspect for leaking or damaged torque converter fluid seal assembly (201), torque converter bushing (206), turbine shaft o-ring seal (443) and torque converter (with fluid pump) housing assembly (2).

No Torque Converter Clutch Apply

No Torque Converter Clutch Release

ChecksCauses
Torque Converter Assembly (1)Diagnose torque converter for possible internal damage. Refer to Torque Converter Diagnosis .
Fluid Pump Cover Assembly (219)Inspect for worn, damaged, or sticking converter feed limit valve (220) and spring (221). Inspect for worn, damaged, or sticking torque converter clutch (TCC) control valve (227) and spring (226).
Control Valve Lower Body Assembly (307)Inspect for worn, damaged, or sticking TCC regulator apply valve (355).

No Torque Converter Clutch Release

No Reverse Gear

ChecksCauses
A//Trans Fluid Pan Assembly (29)Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304)Inspect for sticking, damaged, or worn 3-5-R regulator valve (336) and valve spring (326). Inspect for damaged or missing #5 ball check valve.
Control Valve Lower Body Assembly (307)Inspect for worn, damaged, or sticking clutch select solenoid valve 3 (352) and valve spring (353).
1-2-3-4 and 3-5-R Clutch Assembly (51)Inspect for proper installation of 3-5-R clutch backing plate retaining ring (400). Inspect for worn, damaged, or leaking clutch bearing seal assembly (428). Inspect for damaged or worn 3-5-R clutch plates (401-404). Inspect for damaged 3-5-R clutch piston (421), apply ring (405), and spring (420). Inspect for cut, worn, or damaged 3-5-R clutch piston dam O-ring seal (418), inner seal (419), and outer seal (422). Inspect for improper selective 3-5-R clutch backing plate retaining ring (400).
Torque Converter (with Fluid Pump) Housing Assembly (2)Inspect for worn or damaged 1-2-3-4 and 3-5-R clutch fluid seal rings (230). Inspect for damaged or scored pump housing (203), cover (219), rotor (217), slide (212), and vanes (216). Inspect for damaged or porous pump cover assembly (219). Inspect pump surfaces for flatness. Inspect for excessive fluid pump rotor (217) clearance or damage. Ensure proper selective rotor is being utilized.
Center Support Fluid Passage Seal Assembly (20), A/Trans Fluid Pump Seal Assemblies (18 and 19)Inspect for worn, cut, or damaged seals. Inspect for proper seal (20) size (6L45/50E MYA/MYB) vs (6L80/90E MYC/MYD).
Center (w/2-6 Low and Reverse Clutch) Support Assembly (67)Inspect for damaged or leaking low and reverse clutch piston assembly (470). Inspect for damaged or worn low and reverse clutch plates (462-465). Inspect for damaged low clutch sprag assembly (467). Holding the sprag assembly with the retaining ring facing up, and the inner race of the sprag assembly fixed, the outer race should freewheel counterclockwise.
2-6 and 3-5-R Clutch (with Output Carrier Outer Sun Gear Shaft) Hub Assembly (64)Inspect for damaged or distorted shaft on hub assembly.
Output Shaft Assembly (70)Inspect for damaged or stripped splines on the output shaft.

No Reverse Gear

Fluid Pressure High or Low

ChecksCauses
Torque Converter Housing with Fluid Pump Assembly (2)Inspect for worn, sticking, or damaged pressure regulator valve (233). Inspect for worn, sticking, or damaged pressure regulator valve outer spring (234). Inspect for worn, sticking, or damaged pressure regulator valve inner spring (235). Inspect for worn, sticking, or damaged isolator valve (236) and sleeve (237). Inspect for worn, sticking, or damaged pressure relief ball valve (225). Inspect for worn, sticking, or damaged pressure relief ball valve spring (224). Inspect for damaged or porous pump cover assembly (219). Inspect for pump surfaces not flat. Inspect for excessive fluid pump rotor (217) clearance or damage. Ensure proper selective rotor is being utilized. Inspect for damaged fluid pump slide (212). Ensure proper selective slide is being utilized. Inspect for worn, sticking, or damaged fluid pump slide outer spring (211). Inspect for worn or damaged fluid pump slide seal (213), seal support (214), pivot pin (215), fluid seal ring (209), and O-ring seal (210). Inspect for worn or damaged fluid pump vane rings (207) and rotor guide (208).
Control Valve Upper Body Assembly (321)Inspect for worn, sticking, or damaged actuator feed limit valve (325) and spring (324). Inspect for worn, sticking, or damaged clutch boost valve (329) and spring (330).
Control Valve (w/Body and TCM) Valve AssemblyInspect for leaking or damaged filter plate assembly seals (16). Verify VBS operation in not stuck high or low.
Fluid Filter Assembly (26)Inspect for damaged or restricted fluid filter assembly (26). Inspect for damaged fluid filter seal assembly (25).

Fluid Pressure High or Low

No Torque Converter Clutch Slip with Torque Converter Clutch Engaged

ChecksCauses
Clutch Select Solenoid Valve Spring (353)Inspect for broken spring within the lower valve body in the torque converter clutch regulator apply valve line up (355).

No Torque Converter Clutch Slip with Torque Converter Clutch Engaged

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Exterior Lighting Systems Description and Operation
• Exterior Lights Schematics
• COMPONENT CONNECTOR END VIEWS - INDEX
• INLINE HARNESS CONNECTOR END VIEWS - INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Trouble Code (DTC) List - Vehicle
• Diagnostic Repair Verification
• Brake Pedal Position Sensor Replacement
• Automatic Transmission Controls Schematics
• Electronic Component Description
• Special Tools
• Symptoms - Engine Cooling
• Transmission General Description
• Transmission Component and System Description
• Control Solenoid Valve and Transmission Control Module Assembly Replacement
• Park - Engine Running
• Reverse
• Neutral - Engine Running
• Drive Range, First Gear Engine Braking
• Drive Range, First Gear
• Drive Range, Second Gear
• Drive Range, Third Gear
• Drive Range, Third Gear Default
• Drive Range - Fourth Gear
• Drive Range, Fifth Gear
• Drive Range, Fifth Gear Default
• Drive Range, Sixth Gear
• Transmission Fluid Pressure Switch Logic
• Engine Controls Schematics
• Range Selector Lever Cable Adjustment
• Scan Tool Does Not Communicate with High Speed GMLAN Device
• Transmission Internal Mode Switch Logic
• Diagnostic Starting Point - Vehicle
• Lifting and Jacking the Vehicle
• Brake Pedal Position Sensor Calibration
• Fastener Caution
• Fluid Capacity Specifications
• Symptoms - Engine Controls
• Symptoms - Engine Controls
• Fastener Tightening Specifications (Off Vehicle)
• Fastener Tightening Specifications (On Vehicle)
• Symptoms - Engine Mechanical
• Symptoms - Engine Mechanical (LCV)
• Lower Engine Noise, Regardless of Engine Speed
• Lower Engine Noise, Regardless of Engine Speed
• Brake Pedal Position Sensor Learn
• Reset Transmission Adapts
• Transmission Fluid Level and Condition Check
• Control Solenoid Valve and Transmission Control Module Assembly Inspection
• Road Test
• Line Pressure Check
• Fluid Pressure High or Low
• No Torque Converter Clutch Apply
• No Torque Converter Clutch Release
• Automatic Transmission Fluid Leaks
• Whine/Growl Noise That Changes with Vehicle Speed
• Noise in First or Reverse Gear
• Noise in First, Second, Third, Fourth, Fifth, or Reverse Gear
• Noise in First, Second, Sixth, or Reverse Gear
• Noise in Second or Sixth Gear
• Noise During 3-4 or 4-3 Shifts
• Noise in Fourth, Fifth, or Sixth Gear
• Vibration
• Noise and Vibration Analysis
• No Park or Drive
• No Drive in All Ranges
• No Reverse Gear
• Harsh Garage Shift
• Harsh, Soft, Delayed or Slipping First or Reverse Gear
• Harsh, Soft, Delayed or Slipping 1-2-3-4 Shift
• Harsh, Soft, Delayed or Slipping 4-5-6 Shift
• Harsh, Soft, Delayed or Slipping Third, Fifth, or Reverse Gear
• Harsh, Soft, Delayed or Slipping Second or Sixth Gear
• No First Gear
• No First and Reverse Gears
• No First, Second, Third, and Fourth Gear
• No Second and Sixth Gear
• No Fourth, Fifth, and Sixth Gear
• No Third, Fifth, and Reverse Gear
• Transmission Fluid Fill Procedure
• Engine Coolant/Water in Transmission
• Transmission Fluid Cooler Flushing and Flow Test
• Symptoms - Automatic Transmission

More articles — Transmission