Automatic Transmission - 6t75 - Diagnostic Information and Procedures Buick Enclave I

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Circuit/System Verification

Test for 12.6-15 volts between the battery terminals with the engine running, accessories OFF. If not between 12.6-15 volts Refer to «Charging System Test»(/buick/enclave/i-2007-2013/remont/charging-system/#battery-charging-system-and-starting-system) . IF between 12.6-15 volts
Verify the scan tool TCM Ignition Voltage parameter is between 12.6-15.0 volts. If not between 12.6-15 volts Refer to Circuit/System Testing Below. If between 12.6-15 volts
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Circuit/System Testing

Note. You must perform the Circuit/System Verification first.

Ignition OFF, and all vehicle systems OFF, disconnect the X1 20-way harness connector at the transmission.
Connect the DT-47825-20 adapter harness to the vehicle wire harness X1 20-way transmission connector.
Test for less than 5 ohms between the ground circuit terminal 1 and ground at the transmission case. If 5 ohms or greater Test for less than 2 ohms in the ground circuit end to 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
Ignition ON.
Verify that a test lamp illuminates between the B+ circuit terminal 10 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and circuit fuse is open Ignition OFF. Test the B+ circuit for a short to ground. If B+ circuit has a short to ground, repair the short to ground on the circuit. If B+ circuit does not have a short to ground, replace the fuse. If the test lamp illuminates
Verify that a test lamp illuminates between the ignition circuit terminal 13 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test the ignition circuit for a short to ground. If ignition circuit has a short to ground, repair the short to ground on the circuit. If ignition circuit does not have a short to ground, replace the fuse. If the test lamp illuminates
Replace the Q8 control solenoid valve assembly.

Repair Instructions

Note. Perform the Reset Transmission Adapts following all transmission related repairs. Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Signal	P057C	P057C	P057D	P057B
5 V Reference	P057C P0651	P057C	P0651	M-dash
Low Reference		P057D	P057D	M-dash

Typical Scan Tool Data

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Ignition ON. Brake Pedal Position Sensor Parameter Normal Range: 0.25-4.75 V
5 V Reference	0 V	0 V
Signal	0 V	0 V	5 V
Low Reference		5 V

Brake Pedal Position Sensor

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 three wire sensor, connected to a 5 V reference circuit, a low reference circuit, and a signal circuit. The ECM supplies 5 V to the BPP sensor, and also provides a sensor ground path on the low reference circuit. 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.

Ignition voltage is greater than 10 V.

P057C

BPP sensor voltage is less than 0.25 V for 1 second.

P057D

BPP sensor voltage is greater than 4.75 V for 1 second.

DTCs P057C and P057D are type B DTCs
Engine torque is reduced to 50 percent of available engine torque.
Brake torque management is active at 25 kpa (3.7 PSI) of brake apply pressure.

P057C and P057D are type B DTCs.

Schematic Reference

«Automatic Transmission Controls Schematics»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-wiring-schematic-diagrams)
«Engine Controls Schematics»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-wiring-schematic-diagrams)
«Exterior Lights Schematics»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, engine OFF, transmission in PARK, service brake pedal released.
Verify DTC P0651 is not set. If DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) . If DTC is not set
Verify the scan tool Brake Pedal Position Sensor parameter in the ECM Automatic Transmission Data list displays greater than .25 V. If .25 V or less Refer to Circuit/System Testing. If greater than .25 V
Verify the scan tool Brake Pedal Position Sensor parameter changes as the brake pedal is applied and displays less than 4.75 V when the brake pedal is fully applied. If 4.75 V or greater, or the parameter does not change Refer to Circuit/System Testing. If less than 4.75 V and parameter changes
Verify the scan tool Brake Pedal Position Sensor Learned Home 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 Command the «Brake Pedal Position Sensor Learn»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__brake-pedal-position-sensor-learn) with a scan tool. If difference is 0.1 V or less
Verify the scan tool Brake Pedal Position Sensor parameter transitions smoothly without any spikes or dropouts when slowly applying and releasing the brake. 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
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.
Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
All OK.

Note. You must perform the Circuit/System Verification first.

Ignition OFF and all vehicle systems OFF, disconnect the harness connector from the B22 Brake Pedal Position Sensor. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the low reference circuit terminal 5 and ground. If 10 ohms or greater Ignition OFF and all systems OFF, 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
Ignition ON.
Test for 4.8-5.2 V between the 5 V reference circuit terminal 6 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 terminal 6 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 terminal 6 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 4.8-5.2V
Verify the scan tool Brake Pedal Position Sensor parameter is less than .25 V. If parameter is .25 V or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than .25 V between the signal circuit terminal 4 and ground. If .25 V or greater, repair the short to voltage on the circuit. If less than .25 V, replace the K20 Engine Control Module If less than .25 V
Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 6.
Verify the scan tool Brake Pedal Position Sensor parameter is 4.8 V or greater. If less than 4.8 V Ignition OFF, 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.
Replace the B22 Brake Pedal Position Sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Brake Pedal Position Sensor Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__brake-pedal-position-sensor-replacement)
Perform the «Brake Pedal Position Sensor Learn»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-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.

Control Module References for engine control module replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

DTC Descriptors

Note. DTCs P0601, P0602, P0603, P0604 or P062F could set in other control modules. Verify the DTCs are set in the transmission control module (TCM).

This is an internal fault detection of the control solenoid valve assembly. This fault is handled inside the control solenoid valve assembly and no external circuits are involved.

Ignition voltage is between 8.6 volts and 18.0 volts.

P0601

Read only memory (ROM) test has failed 5 or greater times.

P0602

TCM has not been programmed and is unable to detect the start program.

P0603

TCM has detected a memory checksum error.

P0604

TCM has detected a random access memory (RAM) test error 5 or greater times.

P062F

TCM has detected a non-volatile memory error during power-down.

P0601, P0602, P0603, P0604, or P062F

DTCs P0601, P0603, P0604, and P062F are Type A DTCs.
TCM limits the transmission to Reverse and 5th gear operation.
TCM commands maximum line pressure.
TCM forces the torque converter clutch (TCC) OFF.
TCM freezes transmission adaptive functions.
TCM commands the high side driver OFF.
TCM inhibits neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.

PO602

DTC P0602 is a Type A DTC.
TCM limits the transmission to Reverse and 5th gear operation.

PO601, P0603, P0604, or PO62F

DTCs P0601, P0602, P0603, P0604, and P062F are Type A DTCs.

Description and Operation

Electronic Component Description for control solenoid valve assembly

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Ignition OFF for 1 minute.
Ignition ON.
Verify with a scan tool, that DTC P0602 is not set. If DTC P0602 is set Program the K71 transmission control module. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Programming and Setup (6T70/6T75)»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-solenoid-valve-and-transmission-control) , . If the DTC resets, replace the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) . If DTC P0602 is not set
Verify with a scan tool that DTC P0601, P0603, P0604, or P062F is not set. If DTC P0601, P0603, P0604, or P062F is set Replace the Q8 control solenoid valve assembly. If DTC P0601, P0603, P0604 or P062F is not set
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, refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Note. Perform the Reset Transmission Adapts any time a transmission related component is serviced.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The transmission control module (TCM) temperature sensor is located inside of the control solenoid valve assembly which has no serviceable components. The TCM monitors the TCM sensor for over temperature protection.

Ignition voltage is 8.6 volts or greater.
TCM temperature is between 0-170°C (32-338°F) for 0.25 second or greater.
DTC P0634 is not set.

Condition 1

TCM detects an internal TCM temperature condition of 146°C (295°F) or greater for 5 seconds.

Condition 2

Ignition voltage is 18 volts or greater and the TCM detects an internal temperature condition of 50°C (122°F) or greater for 2 seconds.

DTC P0634 is a Type A DTC.
TCM limits the transmission to Reverse and 5th gear operation.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM commands maximum line pressure.
TCM shuts down.

DTC P0634 is a Type A DTC.

Description and Operation

Electronic Component Description for control solenoid valve assembly

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, review the Failure Records when the DTC set. Verify the scan tool ECT parameter was less than 125°C (257°F). If greater than the specified range Refer to «Engine Overheating»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system__engine-overheating) . If less than the specified value
Verify the scan tool TCM Temperature parameter is less than 146°C (295°F) If greater than the specified range Replace the Q8 control solenoid valve assembly. If less than the specified range
Test for 12.6-15.0 volts between the battery terminals with the engine running, accessories OFF. If not between 12.6-15.0 volts Refer to «Charging System Test»(/buick/enclave/i-2007-2013/remont/charging-system/#battery-charging-system-and-starting-system) . IF between 12.6-15.0 volts
Verify correct fluid level and condition. Refer to «Transmission Fluid Level and Condition Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) .
Operate the vehicle within the conditions for running and setting the DTC until normal engine temperature is reached. Verify the scan tool Trans. Fluid Temp. parameter is less than 140°C ( 284°F) and DTC P0634 did not set. If greater than the specified range Inspect the transmission cooling system for obstructions to the airflow of the radiator or transmission due to debris, kinked, or damaged transmission fluid lines, or damage to the transmission cooler. If problems with cooling system are found, repair or replace as necessary. If no problems are found with cooling system, refer to Refer to «Transmission Fluid Cooler Flushing and Flow Test (Acadia, Enclave)»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__transmission-fluid-cooler-flushing-and-flow) . If less than the specified value and DTC P0634 set Replace the Q8 control solenoid assembly. If less than the specified value and DTC P0634 did not set
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, refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The transmission control module (TCM) high side driver 1 is located inside of the control solenoid valve assembly, which has no serviceable components. The high side driver 1 provides power to the pressure control solenoids and shift solenoids. This fault is handled inside the TCM and no external circuits are involved.

P0658

High side driver 1 is enabled.
DTC P0658 is not set.

P0659

DTC P0659 is not set.

P0658

TCM detects an internal open or short to ground in the high side driver 1 circuit for 1 second.

P0659

During TCM power-up and prior to the high side driver being enabled, the TCM detects an internal short to voltage on the high side driver 1 circuit a total of 3 times out of 5 consecutive readings.

P0658

DTC P0658 is a Type A DTC.
TCM turns the high side driver OFF.
TCM turns OFF all solenoids.
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM commands the torque converter clutch (TCC) OFF.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM limits the transmission to Reverse and 5th gear operation.
TCM inhibits neutral idle.

P0659

DTC P0659 is a Type C DTC.

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

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Ignition ON, verify with a scan tool the High Side Driver 1 parameter displays On or Enabled. If the High Side Driver 1 parameter displays OFF Refer to Circuit/System testing below. If the High Side Driver 1 parameter displays ON or Enabled
Engine Running, gear selector lever in Park position. Verify with a scan tool the following test status parameters display OK: High Side Drvr. 1 Ckt. Low Voltage Test Status High Side Drvr. 1 Ckt. Open Test Status High Side Drvr. 1 Ckt. High Voltage Test Status If any test status parameter displays Fault or Malfunction Refer to Circuit/System Testing below. If all test status parameters display OK
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) . The Q8 control solenoid valve and transmission control module assembly must be externally cleaned of all debris.
Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
Connect the DT-47825-20 adapter harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
Ignition ON, verify with a scan tool the following test status parameters display OK: High Side Drvr. 1 Ckt. Low Voltage Test Status High Side Drvr. 1 Ckt. Open Test Status High Side Drvr. 1 Ckt. High Voltage Test Status If any test status parameter displays Fault or Malfunction If all test status parameters display OK
All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The transmission control module (TCM) temperature sensor is located inside of the control solenoid valve assembly, which has no serviceable components. The TCM temperature sensor provides the temperature of the TCM. This temperature reading is used in various shifting and diagnostic routines in the TCM software. This fault is handled inside the TCM and no external circuits are involved.

P0667

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, P0307, P0308, P0401, P042E, P0658, P0667, P0668, P0669, P06AD, P06AE, P0712, P0713, P0716, P0717, P0722, P0723, P0962, P0963, P0966, P0967, P0970, P0971, P215C, P2720, P2721, P2729, or P2730 is not set.
Brake torque is not active.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
Engine torque signal is valid.
Throttle position signal is valid.

P0668

DTC P0668 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.

P0669

DTC P0669, P0716, P0717, P0722, or P0723 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.

P0667

Difference between the transmission fluid temperature (TFT) and TCM substrate temperature is greater than 20-50°C (36-90°F), depending on the average of the TFT, TCM substrate and TCM power up temperatures.
Difference between the TCM power up temperature and TCM substrate temperature is greater than 8-10°C (14-18°F) depending on the average of the TFT, TCM substrate and TCM power up temperatures.
Above conditions have to be met for 5 minutes within a 6 minute period.

P0668

TCM temperature is -249°C (-416°F) or lower for 1 minute.

P0669

TCM temperature is 249°C (480°F) or greater for 1 minute.

DTCs P0667, P0668, and P0669 are Type B DTCs.
TCM defaults the TCM substrate temperature to the TCM power up temperature.

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

The TCM temperature sensor is located inside of the control solenoid valve assembly and its output should resemble that of the TFT sensor output.

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Electronic Component Description for control solenoid valve assembly

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Ignition ON
Verify the scan tool TCM Temperature parameter is between -249 and +249°C (-416 and +480°F). If not within the specified range Replace the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) If within the specified range
Operate the vehicle at 64 km/h (40 mph) for 10 minutes. Verify the TCM Temperature parameter increases by greater than 2°C (3.5°F) and the TCM Temperature and the Transmission Fluid Temperature parameters are within 20°C (36°F) of each other. If the TCM Temperature parameter does not increase by greater than 2°C (3.5°F) or the TCM Temperature and Transmission Fluid Temperature parameters are not within 20°C (36°F) Replace the Q8 control solenoid valve assembly. If the TCM Temperature parameter increases by greater than 2°C (3.5°F) and the TCM Temperature parameter value is within 20°C (36°F) of the Transmission Fluid Temperature parameter
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, refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The transmission control module (TCM) power up temperature sensor is located inside of the control solenoid valve assembly, which has no serviceable components. The TCM power up temperature sensor provides the temperature of the TCM when the TCM power is ON. This temperature reading is used in various shifting and diagnostic routines and also to protect the control solenoid valve assembly and TCM. This fault is handled inside the TCM and no external circuits are involved.

P06AC

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, P0307, P0308, P0401, P042E, P0658, P0668, P0669, P06AC, P06AD, P06AE, P0712, P0713, P0716, P0717, P0722, P0723, P0962, P0963, P0966, P0967, P0970, P0971, P215C, P2720, P2721, P2729, or P2730 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
Brake torque is not active.
Engine torque signal is valid.
Throttle position signal is valid.

P06AD

DTC P06AD, P0716, P0717, P0722, or P0723 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.

P06AE

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P06AE is not set.

P06AC

Difference between the transmission fluid temperature (TFT) and TCM power up temperature is greater than 20-50°C (36-90°F), depending on the average of the TFT, TCM substrate, and TCM power up temperatures.
Difference between the TCM substrate temperature and TCM power up temperature is greater than 8-10°C (14-18°F) depending on the average of the TFT, TCM substrate, and TCM power up temperatures.
Above conditions have to be met for 5 minutes within a 6 minute period.

P06AD

TCM power up temperature is -59°C (-74°F) or lower for 1 minute.

P06AE

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

DTC P06AC, P06AD, P06AE are Type B DTCs.
TCM defaults the TCM power up temperature to the TCM substrate temperature.

DTC P06AC, P06AD, P06AE are Type B DTCs.

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

«Transmission General Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation__transmission-general-description)
«Electronic Component Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation) for control solenoid valve assembly

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Operate the vehicle at 64 km/h (40 mph) for 10 minutes. If DTC P06AC, P06AD, or P06AE resets Replace the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) . If DTC P06AC, P06AD, or P06AE does not reset
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 you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The transmission fluid temperature (TFT) sensor is located inside of the transmission control module (TCM) assembly which has no serviceable components. The TFT sensor provides transmission fluid temperature to the TCM. This fault is handled inside the TCM and no external circuits are involved.

P0711

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, P0307, P0308, P0401, P042E, P0658, P0668, P0669, P06AD, P06AE, P0711, P0712, P0713, P0716, P0717, P0722, P0723, P0962, P0963, P0966, P0967, P0970, P0971, P215C, P2720, P2721, P2729, or P2730 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
Brake torque is not active.
Engine torque signal is valid.
Throttle position signal is valid.

P0712

DTC P0712, P0716, P0717, P0722, or P0723 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.

P0713

DTC P0713, P0716, P0717, P0722, or P0723 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.

P0711

Difference between the TFT and TCM temperature and the difference between the TFT and TCM power up temperature are both greater than 20-50°C (36-90°F). The temperature threshold is dependent on the average temperature of the TFT, TCM temperature, and TCM power up temperature. The conditions have to be met for 5 minutes within a 6 minute period.

P0712

TFT is -74°C (-101°F) or lower for 1 minute.

P0713

TFT is 174°C (345°F) or greater for 1 minute.

DTCs P0711, P0712, and P0713 are Type B DTCs.
TCM defaults the TFT to the TCM Temperature.

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

The TCM temperature sensor is located inside of the control solenoid valve assembly and its output should resemble that of the TFT sensor output.

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Electronic Component Description for control solenoid valve assembly

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Verify the scan tool Trans. Fluid Temp. parameter is between -74 and +174°C (-101 and +345°F) with the engine idling at operating temperature. If not within the specified range Replace the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) . If within the specified range
Operate the vehicle at 64 km/h (40 mph) for 10 minutes. Verify the scan tool TCM Temperature and Trans. Fluid Temp. parameters are within 20°C (36°F) of each other and DTC P0711, P0712, or P0713 is not set. If parameters are not within 20°C (36°F) or DTC P0711, P0712 P0713 set Replace the Q8 control solenoid valve assembly. If parameters are within 20°C (36°F) and DTC P0711, P0712 P0713 did not set.
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, refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Input Speed Sensor Supply Voltage	P0717	P0717		P0716
Input Speed Sensor Signal	P0716, P0717	P0716, P0717	P0716, P0717	P0716

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature, transmission in PARK Parameter Normal Range: 500-5,800 RPM
ISS/OSS Supply Voltage	0 RPM	0 RPM	0 RPM
ISS Signal	0 RPM	0 RPM	0 RPM

Transmission ISS

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: OK
Input Speed Sensor Supply Voltage	Out of Range	OK	Out of Range

ISS/OSS Supply Voltage

The input speed sensor (ISS) is a hall-effect type sensor. The ISS mounts to the inside of the automatic transmission case assembly and connects to the control solenoid valve assembly through a 2-wire harness and connector. The sensor faces the reluctor wheel which is attached to the 4-5-6 clutch and 3-5-R clutch housing. The sensor receives 8.3-9.3 volts on the ISS supply voltage circuit from the transmission control module (TCM). As the 4-5-6 clutch and 3-5-R clutch housing rotates, the sensor produces a signal frequency based on the teeth of the reluctor wheel. This signal is transmitted through the ISS signal circuit to the TCM. The TCM uses the ISS signal to determine line pressure, transmission shift patterns, torque converter clutch (TCC) slip speed, and gear ratio.

P0716

DTC P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, P0752, P0973, or P0974 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
Engine torque signal is valid.
Throttle position signal is valid.

P0717

DTC P0717 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
Vehicle speed is 16 km/h (10 mph) or greater.
Engine torque is 50 N.m (37 lb ft) or greater.
Engine torque signal is valid.

P0716

Transmission input speed drops 1,350 RPM for 1.0 second and does not recover.

P0717

Transmission input shaft speed is less than 50 RPM for 5.0 seconds.

DTCs P0716 and P0717 are Type A DTCs.
TCM freezes transmission adaptive functions.
TCM commands the high side driver OFF.
TCM commands TCC OFF.
TCM commands maximum line pressure.
TCM disables neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM limits the transmission to Reverse and 5th gear operation.

DTCs P0716 and P0717 are Type A DTCs.

Damage or misalignment of the 4-5-6 clutch and 3-5-R clutch housing reluctor machined teeth surface may cause a speed sensor malfunction.

Schematic Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Electronic Component Description for input speed sensor (ISS)

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, verify with a scan tool the transmission ISS/OSS Supply Voltage parameter displays OK. If the parameter value displays Fault or Malfunction Refer to Circuit/System Testing below. If the parameter value displays OK
Engine idling in Park, while varying the engine speed, verify the scan tool Transmission ISS parameter varies with the engine speed and there are no spikes or dropouts. If the parameter value does not vary with engine speed or has spikes or dropouts. Refer to Circuit/System Testing below. If the parameter value varies with engine speed and there are no spikes or dropouts.
Perform the «Road Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__road-test) . Verify that DTC P0716 or P0717 did not set. If DTC P0716 or P0717 set Refer to Circuit/System Testing below. If DTC P0716 or P0717 did not set
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, remove the control valve body cover. Refer to «Control Valve Body Cover Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Connect the vehicle wire harness X1 20-way transmission electrical connector to the Q8 control solenoid valve assembly electrical connector.
Disconnect the B14C transmission input shaft speed sensor wiring harness connector X3 from the Q8 control solenoid valve assembly.
Ignition ON.
Test for 8.3-9.3 volts between the ISS voltage circuit terminal A X3, on the Q8 control solenoid valve assembly, and ground at the transmission case. If not between 8.3-9.3 volts Replace the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) . If between 8.3-9.3 volts
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If the Q8 control solenoid valve assembly does not pass the Input Shaft Speed/Output Shaft Speed Input Test Replace the Q8 control solenoid valve assembly. If the Q8 control solenoid valve assembly passes the Input Shaft Speed/Output Shaft Speed Input Test
Inspect the reluctor, which is attached to the 4-5-6 clutch and 3-5-R clutch housing assembly, for damage or misalignment with the B14C transmission input shaft speed sensor. If the reluctor is damaged or there is improper alignment Repair or replace as necessary. If the reluctor is not damaged and alignment checks OK
Replace the B14C transmission input shaft speed sensor.

Note. Perform the Reset Transmission Adapts following all transmission related repairs. Input Speed Sensor Replacement Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Tow/haul mode enables the operator to achieve enhanced shift performance when towing or hauling a load. When tow/haul mode is selected, the tow/haul switch input signal to the body control module (BCM) is momentarily toggled to zero volts. This signals the transmission control module (TCM) to extend the length of time between upshifts and increase transmission line pressure. Cycling the tow/haul switch again disables tow/haul mode and returns the transmission to a normal shift pattern.

DTC P1762 is not set.
The engine speed is 400 RPM or greater for 5 seconds.
The ignition voltage is 8.6 volts or greater.

The Tow Mode switch signal circuit has low voltage for 10 minutes.

DTC P071A is a type C DTC.

If the electrical circuit tests are OK and the shift pattern is not occurring, there may be a mechanical/hydraulic condition that prevents operation. Refer to Symptoms - Automatic Transmission .

Schematic Reference

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, engine OFF, observe the Tow/Haul parameter with a scan tool. Operate the Tow/Haul switch several times. The Tow/Haul parameter should toggle between Active and Inactive when the switch is operated.
If the electrical circuit checks are OK and the tow/haul shift pattern is not occurring, there may be a mechanical/hydraulic condition that prevents tow/haul operation. Refer to «Symptoms - Automatic Transmission»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__symptoms-automatic-transmission) .
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, transmission in Park, disconnect the I/P Multifunction Switch connector.
Install a 3 amp fused jumper between the Tow/Haul Switch signal circuit harness connector terminal 11 and ground. Verify the scan tool parameter changes between Active and Inactive each time the signal circuit is grounded. If not the specified value, test the signal circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the BCM.
If all circuits test normal, replace the Tow/Haul switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming.

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
OSS Supply Voltage	P0722	P0722
OSS Signal	P0722, P0723	P0722, P0723	P0722, P0723

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 0-7,000 RPM
OSS Supply Voltage	0 RPM	0 RPM
Transmission OSS Signal	0 RPM	0 RPM	0 RPM

Transmission OSS

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Key ON, Engine OFF or Engine running, normal operating temperature Parameter Normal Range: OK
Transmission OSS Signal	OK	OK	OK
OSS Supply Voltage	Out of Range	OK	Out of Range

ISS/OSS Supply Voltage

The output speed sensor (OSS) is a hall-effect type sensor. The sensor faces the front differential transfer drive gear. The sensor receives 8.3-9.3 volts on the OSS supply voltage circuit from the transmission control module (TCM). As the output shaft rotates, the sensor produces a signal frequency based on the machined surface of the output shaft. This signal is transmitted through the OSS signal circuit to the TCM. The TCM uses the OSS signal to determine line pressure, transmission shift patterns, torque converter clutch (TCC) slip speed and gear ratio.

P0722

DTC P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, P0722, or P0723 is not set.
Selected range is not PARK or NEUTRAL.
Transmission input speed is 1,000 RPM or greater.
Engine speed is 3,200 RPM or greater.
Throttle position is 5 percent or greater.
Throttle position signal is valid.
Engine torque is 35 N.m (26 lb ft) or greater.
Engine torque signal is valid.
Transmission fluid temperature is -40°C (-40°F) or greater.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.

P0723

DTC P0101, P0102, P0103, P0121, P0122, P0123, P0723, P0973, P0974, P0976, or P0977 is not set.
Greater than 5 seconds since last range change.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.

P0722

Transmission output speed is 70 RPM or less for 5 seconds.

P0723

Transmission output speed is 210 RPM or greater for 0.2 second.
Transmission output speed drops greater than 650 RPM and does not recover for 1.5 seconds.

DTCs P0722 and P0723 are Type A DTCs.
TCM freezes transmission adaptive functions.
TCM turns the high side driver OFF.
TCM commands maximum line pressure.
TCM inhibits neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM limits the transmission to Reverse and 5th gear operation.

Conditions for Clearing the DIC/DTC

DTCs P0722 and P0723 are Type A DTCs.

Damage or misalignment of the front differential transfer drive gear teeth surface or metallic debris on the face of the sensor may cause a speed sensor malfunction.
Proper torque of the OSS mounting bolt is critical to proper OSS operation.

Schematic Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Electronic Component Description for OSS

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, verify with a scan tool the transmission ISS/OSS Supply Voltage parameter displays OK. If the parameter value displays Fault or Malfunction Refer to Circuit/System Testing below. If the parameter value displays OK
Operate the vehicle at 16-32 km/h (10-20 mph). Verify with a scan tool the Transmission OSS parameter varies with the vehicle speed and there are no spikes or dropouts. If the parameter value does not vary with vehicle speed or has spikes or dropouts Refer to Circuit/System Testing below, If the parameter value varies with vehicle speed and there are no spikes or dropouts
Perform the «Road Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__road-test) . Verify DTC P0722 or P0723 did not reset. If DTC P0722 or P0723 set Refer to Circuit/System Testing below. If DTC P0722 or P0723 did not set
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, remove the control valve body cover. Refer to «Control Valve Body Cover Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Connect the vehicle wire harness X1 20-way transmission electrical connector to the Q8 control solenoid valve assembly.
Disconnect the B14A transmission output shaft speed sensor harness connector X4 from the Q8 control solenoid valve assembly.
Ignition ON.
Test for 8.3-9.3 volts between the OSS voltage circuit terminal A on the Q8 control solenoid valve assembly X4 connector and ground at the transmission case. If not between 8.3-9.3 volts Replace the Q8 control solenoid valve assembly. If between 8.3-9.3 volts
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . If the Q8 control solenoid valve assembly does not pass the Input Shaft Speed/Output Shaft Speed Input Test Replace the Q8 control solenoid valve assembly. If the Q8 control solenoid valve assembly passes the Input Shaft Speed/Output Shaft Speed Input Test
Inspect the front differential transfer drive gear teeth surface for damage and misalignment with the B14A transmission output speed sensor, and for metallic debris on the face of the sensor. If the front differential transfer drive gear teeth are damaged, there is improper alignment, or metallic debris on the face of the sensor Repair or replace as necessary. If the front differential transfer drive gear teeth are not damaged, alignment checks OK and no metallic debris is on the face of the sensor
Replace the B14A transmission output speed sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Output Speed Sensor Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle)
«Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The torque converter clutch (TCC) pressure control (PC) solenoid is part of the control solenoid valve assembly which has no serviceable components. The TCC PC solenoid is a normally low pressure control solenoid. The TCC PC 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 (TCM) will increase TCC PC current flow, duty cycle, to the TCC solenoid. The TCC PC 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 TCM decreasing current flow to the TCC PC solenoid. This results in decreasing the apply pressure which allows the TCC control valve to move to the release position. The TCM calculates torque converter slip speed based on engine speed and transmission input shaft speed.

P0741

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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, P0741, P0742, P2763, or P2764 is not set.
Engine speed is 400 RPM or greater for 5.0 seconds.
Ignition voltage is 8.6 volts or greater.
Transmission fluid temperature (TFT) is between 20 to +130°C (68-266°F).
Throttle position is 8 percent or greater.
Engine torque is 50 N.m (36 lb ft) or greater.
2nd gear ratio is between 2.67-3.07.
3rd gear ratio is between 1.71-1.97.
4th gear ratio is between 1.32-1.51.
5th gear is between 0.93-1.07.
6th gear is between 0.69-0.79.
TCC is commanded ON.
Engine torque signal is valid.
Throttle position signal is valid.

P0742

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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, P0741, P0742, P2763, or P2764 is not set.
Commanded range is 2nd gear or higher.
Ignition voltage is 8.6 volts or greater.
TFT is between 20 to +130°C (68-266°F).
Throttle position is 8 percent or greater.
Engine torque is 80 N.m (59 lb ft) or greater.
Engine speed is 400 RPM or greater for 5 seconds.
Vehicle speed is 16 km/h (10 mph) or greater.
Engine speed is 500 RPM or greater
Engine torque signal is valid.
Throttle position signal is valid.
TCC is commanded OFF.

P0741

TCC Pressure command is 500 kPa (73 psi) or greater for 2 seconds.
TCM detects TCC slip 50 RPM or greater for 4 seconds when the TCC is commanded ON. This must occur 3 times.

P0742

TCM detects the TCC slip between -20 and +30 RPM for 2.5 seconds or greater when the TCC is commanded OFF. This must occur 6 times.

P0741

DTC P0741 is a Type B DTC.
TCM inhibits 6th gear.
TCM inhibits TCC.
TCM forces hot mode shift pattern.

P0742

DTC P0742 is a Type A DTC.
TCM freezes transmission adaptive functions.
TCM forces hot mode shift pattern.
TCM disables neutral idle.

P0741

DTC P0741 is a Type B DTC.

P0742

DTC P0742 is a Type A DTC.

Schematic Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Review the TCM Freeze Frame/Failure Records to determine if DTC P0716 or P0717 was set. If DTC P0716 or P0717 was set Diagnose that DTC first. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) . If DTC P0716 or P0717 was not set
Verify correct transmission fluid level and condition. Refer to «Transmission Fluid Level and Condition Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) .
Ignition ON, clear the TCM DTCs.
Perform the «Road Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__road-test) . Verify the transmission operation performs as indicated in the road test instructions and DTC P0741 or P0742 did not set. If DTC P0741 or P0742 sets Refer to Circuit/System Testing below. If DTC P0741 or P0742 did not set
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Perform the «Line Pressure Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) . Verify the transmission line pressures are within the specified ranges. If the line pressures are not within the specified ranges Refer to «Fluid Pressure High or Low»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__fluid-pressure-high-or-low) . If the line pressures are within the specified ranges
Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle)
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . Test all solenoids on the Q8 control solenoid valve assembly. A pressure change should occur for each solenoid. If a pressure change does not occur for each solenoid tested Replace the Q8 control solenoid valve assembly. If a pressure change occurs for each solenoid
Listed in the table below are conditions for each component that could set DTC P0741 or P0742. Carefully inspect each component for that condition. Repair or replace as necessary.

DTCs	Component	Condition
P0741 P0742	Upper Valve Body	TCC Control Valve Stuck TCC control valve Damaged valve/bore
P0741 P0742	Upper Valve Body	TCC Regulator Valve Stuck TCC regulator valve Damaged valve/bore
P0741 P0742	Q8 Control Solenoid Valve Assembly	TCC Pressure Control Solenoid Not pressurizing - Stuck OFF or leaking Not exhausting - Stuck ON Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal
P0741	Channel Plate and Spacer Plate	Oil channels or orifices blocked by debris
P0741	Torque Converter	Torque converter clutch delamination or material worn off Damaged seal Converter bolts too long - damaging the clutch apply surface
P0741	Support	Damaged seal
P0741 P0742	A/Trans Case Cover (403)	Release blow-off Not seating/sealing Damaged Spring
P0741	Upper Valve Body	Release exhaust port/orifice plugged or blocked.
P0741	Turbine Shaft	Turbine shaft O-ring seal cut or damaged

DTC P0741 or P0742

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Control Valve Lower Body and Upper Body Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle)
«Torque Converter Removal»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-off-vehicle)
«Torque Converter Installation»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-off-vehicle)
«Torque Converter and Differential Housing, Front Differential Transfer Drive Gear, and Front Differential Carrier Removal»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-off-vehicle) , and «Torque Converter and Differential Housing Installation»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-off-vehicle)
«Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The shift solenoid (SS) valve 1 is part of the control solenoid valve assembly, which has no serviceable components. The solenoid operates by the transmission control module (TCM) opening or closing the ground circuit. With the solenoid circuit open, the plunger forces the metering ball against the actuator feed limit seat, blocking the flow and any existing pressure is exhausted through the exhaust port. With the solenoid circuit grounded, solenoid on, the internal plunger moves, allowing the metering valve to move away from the actuator feed limit seat and against the exhaust seat, creating signal fluid pressure. The signal fluid pressure acts against the clutch select valve 2 to overcome the valve spring force, moving the valve to the apply position. Fluid pressure from the R1/4-5-6 regulator valve flows through clutch select valve 2 and is directed to either the low and reverse clutch or the 4-5-6 clutch, depending on the position of clutch select valve 2.

P0751

Ignition voltage is 8.6 volts or greater.
Engine speed is 400 RPM or greater for 5.0 seconds.
Throttle position signal is valid.
Engine torque signal is valid.
High side driver is enabled.
Transmission fluid temperature (TFT) is 0°C (32°F) or greater.
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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.

P0752

Ignition voltage is 8.6 volts or greater.
Engine speed is 400 RPM or greater for 5.0 seconds.
High side driver is enabled.
Throttle position signal is valid.
TFT is 0°C (32°F) or greater.
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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.

P0751

Commanded gear equals first lock, the gear ratio is 1.34-1.48, and gear box slip is 200 RPM or greater for 0.3 second, 8 times.

P0752

Transmission has achieved 1st Locked, 1st Free-Wheel, or 2nd, the 456/R1 pressure switch is pressurized, 3rd gear is commanded, and gear box slip is 200 RPM or greater for 2.0 seconds, 5 times.

P0751

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

P0752

DTC P0752 is a Type A DTC.
TCM freezes transmission adaptive functions.
TCM commands maximum line pressure.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM limits the transmission to Reverse, 1st, and 3rd gear operation.

P0751

DTC P0751 is a Type B DTC.

P0752

DTC P0752 is a Type A DTC.

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

Schematic Reference

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Verify correct transmission fluid level and condition. Refer to «Transmission Fluid Level and Condition Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) .
From a stop, accelerate to 72 km/h (45 mph) with the calculated throttle position greater than 15 percent. Perform this test 8 times. DTCs P0751 or P0752 should not set If DTC P0751 or P0752 sets Refer to Circuit/System Testing below. If DTC P0751 or P0752 does not set
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Verify the transmission line pressures are within the ranges specified in the Line PC Solenoid Valve Pressure table. Refer to «Line Pressure Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) , and «Solenoid Valve Pressure»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__solenoid-valve-pressure) . If line pressures are not within the specified ranges Refer to «Fluid Pressure High or Low»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__fluid-pressure-high-or-low) If line pressures are within the specified ranges
Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . Test all solenoids on the Q8 control solenoid valve assembly. A pressure change should occur for each solenoid. If a pressure change does not occur for each solenoid tested Replace the Q8 control solenoid valve assembly. If a pressure change occurs for each solenoid
Listed in the table below are conditions for each component that could set DTC P0751 or P0752. Carefully inspect each component for that condition. Repair or replace as necessary.

DTCs	Component	Condition
P0751 P0752	Upper 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 - undersized bore plug causing a leak - plug should be a valve fit in the bore.
P0751	Upper Control Valve Body	Check ball #2 - missing, damaged/malformed, seat in the valve body damage/leaking.
P0751 P0752	Q8 Control Solenoid Valve Assembly	Shift Solenoid 1 Not pressurizing - Stuck OFF or leaking Not exhausting - Stuck ON Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal Pressure control solenoid 3 - Stuck On or Off or leaking
P0751 P0752	Channel Plate and Spacer Plate	Oil channels or orifices blocked by debris
P0751	Lower Control Valve Body	Low and reverse, and 4-5-6 clutch regulator valve - stuck or sticking - debris, sediment, binding, or scored bore

DTC P0751 or P0752

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, or programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The shift solenoid (SS) valve 2 is part of the control solenoid valve assembly, which has no serviceable components. The SS valve 2 is a normally closed (NC) solenoid valve and controls fluid to the clutch select valve 3. The solenoid operates by the transmission control module (TCM) opening or closing the ground circuit. With the solenoid circuit grounded, solenoid on, the internal plunger moves and allows the metering ball to move away from the feed seat and against the exhaust seat, 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.

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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
Engine speed is 400 RPM or greater for 5.0 seconds.
High side driver is enabled.
Ignition voltage is 8.6 volts or greater.
Throttle position signal is valid.
Transmission fluid temperature (TFT) is 0°C (32°F) or greater.

Commanded Gear is 1st locked.
Gearbox Slip is 200 RPM or greater for 3.5 seconds.
If above conditions exist, the TCM will command second range. If the gear ratio is between 2.7 and 3.0 for 1.0 second, the counter will increment. DTC will set after 2 occurrences.

DTC P0756 is a Type A DTC.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM inhibits neutral idle.
TCM limits the transmission to Reverse and 1st and 3rd gear operation.

DTC P0756 is a Type A DTC.

Schematic Reference

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Verify correct fluid level and condition. Refer to «Transmission Fluid Level and Condition Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) .
Ignition ON, clear the TCM DTCs.
Engine running, brakes applied, transmission gear shift selector in Reverse. Shift to Drive and accelerate to 56 km/h (35 mph) with calculated throttle position greater than 15 percent. Perform this test 5 consecutive times. Verify DTC P0756 did not set. If DTC P0756 sets Refer to Circuit/System Testing below. If DTC P0756 did not set
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Verify the transmission line pressures are within the ranges specified in the Line PC Solenoid Valve Pressure table. Refer to «Line Pressure Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) , and «Solenoid Valve Pressure»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__solenoid-valve-pressure) . If line pressures are not within the specified ranges Refer to «Fluid Pressure High or Low»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__fluid-pressure-high-or-low) . If line pressures are within the specified ranges
Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . Test all solenoids on the Q8 control solenoid valve assembly. A pressure change should occur for each solenoid valve. If a pressure change does not occur for each solenoid Replace the Q8 control solenoid valve assembly. If a pressure change occurs for each solenoid
Listed in the table below are conditions for each component that could set DTC P0756. Carefully inspect each component for that condition. Repair or replace as necessary.

DTCs	Component	Condition
P0756	Upper Control Valve Body	Clutch select valve 3 stuck off - debris, sediment, binding or scored bore Bore plug - clutch select valve 3 - undersized bore plug causing a leak - plug should be a valve fit in the bore. Check ball #3 - missing, damaged/malformed, Seat in the valve body damage/leaking.
P0756	Q8 Control Solenoid Valve Assembly	Shift solenoid 2 not pressurizing - Stuck Off or leaking Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal
P0756	Channel Plate and Spacer Plate	Oil channels or orifices blocked by debris
P0756	Pump Assembly	Fluid pump vanes and fluid pump rotor broken
P0756	Pump Seal	Seal is torn or cut, causing a small leak that is overcome with enough speed and pump capacity.
P0756	Mechanical Diode	Broken or not capable of holding torque

DTC P0756

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Control Valve Upper Body Assembly Cleaning and Inspection»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-off-vehicle)
«Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, setup, or programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The clutch pressure control (PC) solenoid 2 is part of the control solenoid valve assembly, which has no serviceable components. The PC solenoid 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 (TCM) calculates gear ratio based on the RPM signals from the input speed sensor (ISS) and the output speed sensor (OSS). The TCM compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear.

P0776

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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
Ignition voltage is 8.6 volts or greater.
Engine speed is 400 RPM or greater for 5.0 seconds.
Transmission fluid temperature (TFT) is 0°C (32°F) or greater.
Transmission output speed is 16 RPM or greater, or the throttle position is 0.4 percent or greater.
Throttle position signal is valid.
High side driver is enabled.

P0777

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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
Ignition voltage is 8.6 volts or greater.
Engine speed is 400 RPM or greater for 5.0 seconds.
TFT is 0°C (32°F) or greater.
Engine torque is 20 N.m (15 lb ft) or greater.
Transmission output speed is 16 RPM or greater, or the throttle position is 0.4 percent or greater.
Throttle position signal is valid.
High side driver is enabled.

P0776

TCM has detected an incorrect gear ratio or neutral condition when the 3-5-Reverse clutch is commanded ON. This condition must occur 3 times.

P0777

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

P0776

DTC P0776 is a Type A DTC.
TCM commands maximum line pressure.
TCM inhibits Tap Up/Down function.
TCM freezes transmission adaptive functions.
TCM inhibits manual shifting of forward gears.
TCM limits the transmission to Reverse, 2nd, and 4th gear operation.

P0777

DTC P0777 is a Type A DTC.
TCM commands maximum line pressure.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM freezes transmission adaptive functions.
TCM limits the transmission to 3rd gear and Reverse operation.
TCM inhibits neutral idle.

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

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References

Engine idling in Park, with parking brake applied and drive wheels chocked.
Verify correct transmission fluid level and condition. Refer to «Transmission Fluid Level and Condition Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) .
Verify with a scan tool the TFP Switch 1 parameter values are correct for the Park, Reverse, and Neutral gear select lever positions. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) . If not the correct values for TFP Switch 1 Refer to Circuit/System Testing below. If TFP Switch 1 values are correct
Gear select lever in Drive range. Verify the TFP Switch 1 parameter states are correct for all forward ranges when commanded with a scan tool. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) If not the correct values for TFP Switch 1 Refer to Circuit/System Testing below. If TFP Switch 1 values are correct
Ignition ON, clear the TCM DTCs.
Perform the «Road Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__road-test) . Verify the transmission operation performs as indicated in the road test instructions and DTC P0776 or P0777 did not set. If DTC P0776 or P0777 sets Refer to Circuit/System Testing below. If DTC P0776 or P0777 did not set
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Verify the transmission line pressures are within the ranges specified in the Line PC Solenoid Valve Pressure table. Refer to «Line Pressure Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) , and «Solenoid Valve Pressure»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__solenoid-valve-pressure) . If line pressures are not within the specified ranges Refer to «Fluid Pressure High or Low»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__fluid-pressure-high-or-low) If line pressures are within the specified ranges
Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . A pressure change should occur for each solenoid valve. If a pressure change does not occur for each solenoid Replace the Q8 control solenoid valve assembly If a pressure change occurs for each solenoid
Listed in the table below, are conditions for each component that could set DTC P0776 or P0777. Carefully inspect each component for that condition. Repair or replace as necessary.

DTCs	Component	Condition
P0776 P0777	Upper Control Valve Body Assembly (349)	3-5-R regulator valve (336) stuck/sticking - debris, binding, damaged valve, or scored bore
P0776	Lower Control Valve Body Assembly (374)	Actuator feed limit circuit supply fluid to solenoid restricted or not available - debris, stuck limit valve (362) or sediment blockage 3-5-R clutch boost valve (364) - binding or scored bore - can cause harsh shifts
P0776 P0777	Q8 Control Solenoid Valve Assembly	Clutch pressure control solenoid 2 stuck On or stuck Off Control solenoid valve filter plate assembly, blocked or damaged gasket seal
P0776	Channel Plate and Spacer Plate	Oil channels or orifices blocked by debris
P0776 P0777	A/Trans Fluid Pump (203)	Fluid pump housing vanes/rotor/slide damaged/scored A/Trans pump fluid outlet seal assembly (57) damaged/leaking
P0776	A/Trans Fluid Filter Assembly (201)	Oil filter (201) or filter seal (202) loose or damaged
P0776	Transmission Cooling/Lubrication	Restriction/leak in oil to air (OAC) cooler/radiator Restricted/leaking/kinked/damaged transmission oil cooler lines Restriction/leak in transmission fluid pump assembly
P0776	Torque Converter Assembly (27)	Torque converter overstressed due to high temperature, fluid boiled out
P0776	Automatic Transmission Fluid Filter Assembly (201)	Oil filter (201) or filter seal (202) loose, plugged, or damaged
P0776	4-5-6 and 3-5-R Clutch Housing Assembly	3-5-R clutch backing plate retaining ring not seated or wave plate broken Torn, cut, or rolled 3-5-R piston seal (417) Inner/outer seal damaged Dam pressure too high
P0776	A/Trans Case Cover (403)	Blow off regulator ball stuck.
P0776 P0777	Input shaft support	3-5-R and 4-5-6 clutch fluid seal rings (404) damaged, worn, or leaking

DTC P0776 or P0777

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Control Valve Lower Body and Upper Body Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle)
«Low and Reverse Clutch and 1-2-3-4 Clutch Plate Removal»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-off-vehicle)
«Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The clutch pressure control (PC) solenoid 3 is part of the control solenoid valve assembly, which has no serviceable components. The PC solenoid 3 regulates transmission fluid pressure (TFP) to the R1/4-5-6 clutch regulator valve which controls pressure to the low and reverse clutch and the 4-5-6 clutch. The transmission control module (TCM) calculates gear ratio based on the RPM signals from the input speed sensor (ISS) and the output speed sensor (OSS). The TCM compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear.

P0796

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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
Ignition voltage is 8.6 volts or greater.
Engine speed is 400 RPM or greater for 5.0 seconds.
Output speed is 16 RPM or greater, or the throttle position is 0.4 percent or greater.
Throttle position signal is valid.
High side driver is enabled.
Transmission fluid temperature (TFT) is 0°C (32°F) or greater.

P0797

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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
Ignition voltage is 8.6 volts or greater.
Engine speed is 400 RPM or greater for 5.0 seconds.
Output speed is 16 RPM or greater, or the throttle position is 0.4 percent or greater.
Throttle position signal is valid.
High side driver is enabled.
TFT is 0°C (32°F) or greater.
Engine torque is 20 N.m (15 lb ft) or greater when 1st gear is commanded.

P0796

The TCM has detected an incorrect gear ratio or neutral condition when the low and reverse clutch or the 4-5-6 clutch is commanded ON. This condition must occur 2 times.

P0797

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

P0796

DTC P0796 is a Type A DTC.
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM limits the transmission to Reverse, 1st, and 3rd gear operation.
TCM inhibits neutral idle.

P0797

DTC P0797 is a Type A DTC.
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM limits the transmission to Reverse and 4th gear operation.
TCM inhibits neutral idle.

DTCs P0796 and P0797 are Type A DTCs.

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine idling in Park, with parking brake applied and drive wheels chocked.
Verify correct transmission fluid level and condition. Refer to «Transmission Fluid Level and Condition Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) .
Verify with a scan tool the TFP Switch 5 parameter values are correct for the Park, Reverse, and Neutral range gear select lever positions. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) . If not the correct values for TFP Switch 5 Refer to Circuit/System Testing below. If TFP Switch 5 values are correct
Gear select lever in Drive range. Verify the TFP Switch 5 parameter states are correct for all forward ranges when commanded with a scan tool. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) . If not the correct values for TFP Switch 5 Refer to Circuit/System Testing below. If TFP Switch 5 values are correct
Ignition ON, clear the TCM DTCs.
Perform the «Road Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__road-test) . Verify the transmission operation performs as indicated in the road test instructions and DTC P0796 or P0797 did not set. If DTC P0796 or P0797 sets Refer to Circuit/System Testing below. If DTC P0796 or P0797 did not set
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Verify the transmission line pressures are within the ranges specified in the Line PC Solenoid Valve Pressure table. Refer to «Line Pressure Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) , and «Solenoid Valve Pressure»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__solenoid-valve-pressure) . If line pressures are not within the specified ranges Refer to «Fluid Pressure High or Low»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__fluid-pressure-high-or-low) If line pressures are within the specified ranges
Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . Test all solenoids on the Q8 control solenoid valve assembly. A pressure change should occur for each solenoid valve. If a pressure change does not occur for each solenoid Replace the Q8 control solenoid valve assembly. If a pressure change occurs for each solenoid
Listed in the table below, are conditions for each component that could set DTC P0796 or P0797. Carefully inspect each component for that condition. Repair or replace as necessary.

DTCs	Component	Condition
P0796 P0797	Control Valve Upper Body Assembly (349)	4-5-6 regulator valve (326) stuck/sticking - debris, binding, damaged valve, or scored bore
P0796	Channel Plate and Spacer Plate	Oil channels or orifices blocked by debris
P0796	Lower Control Valve Body Assembly (374)	Actuator feed limit circuit supply fluid to solenoid restricted or not available, debris, stuck limit valve (362), or sediment blockage 4-5-6 clutch boost valve (360) - binding or scored bore - can cause harsh shifts 4-5-6 clutch accumulator piston (366) - leaking, cracked, or broken
P0796 P0797	Input shaft support	3-5-R and 4-5-6 clutch fluid seal rings (404) damaged, worn, or leaking
P0796 P0797	Q8 Control Solenoid Valve Assembly (314)	Clutch pressure control solenoid 3 stuck On or stuck Off Control solenoid filter plate assembly cracked, blocked, or damaged gasket seal
P0796	4-5-6 Clutch Housing Assembly (441)	4-5-6 clutch piston assembly (439) damaged/leaking Inner/outer seal damaged Dam pressure too high
P0796	A/Trans Case Cover (403)	Blow off regulator ball stuck
P0796	Transmission Cooling/Lubrication	Restriction/leak in oil to air (OAC) cooler/radiator Restricted/leaking/kinked/damaged transmission oil cooler lines Restriction/leak in transmission fluid pump assembly
P0796	Torque Converter Assembly (27)	Fluid pump or torque converter overstressed due to high temperature, fluid boiled out
P0796	4-5-6 Reaction Carrier Hub Assembly	4-5-6 reaction carrier hub/shaft - broken hub weld
P0796	A/Trans Fluid Filter Assembly (201)	Oil filter (201) or filter seal (202) loose or damaged
P0796	A/Trans Fluid Pump (203)	A/Trans pump fluid outlet seal assembly (57) damaged/leaking

DTC P0796 or P0797

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Control Valve Lower Body and Upper Body Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle)
«Low and Reverse Clutch and 1-2-3-4 Clutch Plate Removal»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-off-vehicle) , and «3-5-Reverse and 4-5-6 Clutch Housing Disassemble»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-off-vehicle)
«Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Tap Upshift Switch	P0826	P0826	P0815
Tap Downshift Switch	P0826	P0826	P0816
Up and Down Shift Switch	P0826	P0826	P0826

Driver Shift Request

When the shift lever is placed in manual mode (M), electronic range select (ERS), which allows for the selection of the range of gears available, is activated. This is also known as the tap shift function. The ERS allows the vehicle operator to increase the highest range by pressing the plus (+) button or decrease the highest range by pressing the minus (-) button. The body control module (BCM) supplies 12 volt reference circuit and a signal circuit to the shift controller. The shift controller has switches connected to a resistor array. A voltage drop occurs across the resistor network. When the plus or minus button is pressed, a corresponding voltage drop occurs across the resistor network. This voltage drop is monitored by the BCM. The BCM will send the request to the transmission control module (TCM) to increase or decrease the available gear ranges.

P0815 or P0816

DTC P0815, P0816, P0826, P1761, P182E, P1876, P1877, or P1915 is not set.
Time since range change is greater than 1 second.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.

P0826

Engine speed is greater than 400 RPM for at least 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P0826 or 1761 is not set.

P0815 - Condition 1

TCM detects an upshift request for 1 second in PARK or neutral.

P0815 - Condition 2

TCM detects an upshift request for 10 minutes in any forward range.

P0816 - Condition 1

TCM detects a downshift request for 1 second in PARK or neutral.

P0816 - Condition 2

TCM detects a downshift request for 10 minutes in any forward range.

P0826

TCM detects an invalid voltage on the Tap Up/Down signal circuit for 1 minute.

DTCs P0815, P0816, and P0826 are Type C DTCs.
TCM disables TAP shift operation.

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

Schematic Reference

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Verify no other DTCs are set. If other DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) . If no other DTCs are Set
Verify the scan tool Driver Shift Control parameter displays Active with the transmission shift lever in the manual mode (M) position. If the parameter does not display Active Refer to Circuit/System Testing below. If the parameter displays Active
Verify the scan tool Driver Shift Request parameter displays None with the transmission shift lever in the manual mode (M) position. If parameter does not display None Refer to Circuit/System Testing below. If parameter displays None
With the transmission shift lever in the manual mode (M) position, verify the scan tool Driver Shift Request parameter changes from None to Upshift when the plus button is pressed, and from None to Downshift when the minus button is pressed. If the parameter does not display the correct values Refer to Circuit/System Testing below. If the parameter displays the correct values
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, disconnect the harness connector at the S3 transmission shift lever.
Ignition ON, Engine OFF.
Verify that a test lamp illuminates between the vehicle harness S3 transmission shift lever connector 12 volt circuit terminal A and ground. If the test lamp does not illuminate Ignition OFF Test for less than 5 ohms in the 12 volt circuit end to end. If 5 ohms or greater, repair the open/high resistance in the circuit. If less than 5 ohms, replace the K9 body control module. If the test lamp illuminates
Ignition OFF.
Test for 6.5-7.1 kohms between the S3 transmission shift lever connector terminals A and B. Verify the resistance changes to 3.8-4.2 kohms when the minus button is pressed and 1.7-2.1 kohms when the plus button is pressed. If not the correct values Replace the S3 transmission shift lever. If the correct values
Disconnect the X1 harness connector at the K9 body control module.
Test for infinite resistance between the harness S3 transmission shift lever connector signal circuit terminal B and Ground. If less than infinite resistance Repair the short to ground in the signal circuit. If infinite resistance
Test for less than 10 ohms between the harness S3 transmission shift lever connector signal circuit terminal B and harness the X1 K9 body control module connector terminal 20. If 5 ohms or greater Repair the open/high resistance in the circuit. If less than 5 ohms
Replace the K9 body control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or control solenoid valve assembly replacement, setup and programming
«Transmission Control Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle)

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Transmission Fluid Pressure Switch 1 Signal	P0842	P0843	P0843
Transmission Fluid Pressure Switch 3 Signal	P0872	P0873	P0873
Transmission Fluid Pressure Switch 4 Signal	P0877	P0878	P0878
Transmission Fluid Pressure Switch 5 Signal	P0989	P0990	P0990

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 1 Signal	Low	High	High

Transmission Fluid Pressure Switch 1

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 3 Signal	Low	High	High

Transmission Fluid Pressure Switch 3

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 4 Signal	Low	High	High

Transmission Fluid Pressure Switch 4

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 5 Signal	Low	High	High

Transmission Fluid Pressure Switch 5

The transmission fluid pressure (TFP) switch 1 is part of the control solenoid valve assembly, which has no serviceable components. The transmission control module (TCM) supplies a signal circuit to the TFP Switch 1. The TFP Switch 1 has an internal case ground. TFP Switch 1 is normally closed or LOW. When oil pressure is present at the TFP 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 TCM monitors the TFP 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 TFP switch 1. When the 3-5 reverse clutch is commanded ON, the 3-5 reverse clutch regulator valve moves and pressure to the TFP switch 1 is exhausted through the 3-5 reverse clutch regulator valve.

P0842 or P0843

DTC P0711, P0712, P0713, P0716, P0717, P0722, P0723, P0742, P0751, P0756, P0757, P0973, P0974, P0976, P0977, P1915, or P182E is not set.
High side driver is enabled.
Engine speed is 400 RPM or greater for 5.0 seconds.
Engine speed is 550 RPM or greater.
Ignition voltage is 8.6 volts or greater.
Transmission fluid temperature (TFT) is between 0 to +120°C (32-248°F).

P0842

The TCM detects that the TFP switch 1 signal voltage remains LOW after the 3-5-Reverse clutch transitions from a HIGH pressure state to a LOW pressure state. The TCM counts each incident. The DTC sets when 25 counts are accumulated.

P0843

The TCM detects that the TFP switch 1 signal voltage remains HIGH after the 3-5-Reverse clutch transitions from a LOW pressure state to a HIGH pressure state. The TCM counts each incident. The DTC sets when 35 counts are accumulated.

DTCs P0842 and P0843 are Type C DTCs.
TCM freezes transmission adaptive functions for the 3-5-Reverse clutch.

DTCs P0842 and P0843 are Type C DTCs.

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

Schematic Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

«Transmission General Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation__transmission-general-description)
«Electronic Component Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation) for control solenoid valve assembly

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Engine idling in Park with parking brake applied, and drive wheels chocked.
Verify with a scan tool the TFP Switch 1, TFP Switch 3, TFP Switch 4, and TFP Switch 5 parameter states are correct for the Park, Reverse, and Neutral gear select lever positions. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) . If any parameter value is not correct for a given gear range Refer to Circuit/System Testing below. If the parameter values are correct for all gear ranges
Verify the TFP Switch 1, TFP Switch 3, TFP Switch 4, and TFP Switch 5 parameter states are correct for each forward range with the gear select lever in Drive, using the scan tool to command all forward ranges. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) . If any parameter value is not correct for a given gear range Refer to Circuit/System Testing below. If the parameter values are correct for all gear ranges
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF. Remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
Ignition ON, verify with a scan tool that the TFP Switch 1, TFP Switch 3, TFP Switch 4, and TFP Switch 5 parameters change states when gently pushing on each TFP switch with the eraser end of a pencil. If any TFP Switch parameter does not change states Replace the Q8 control solenoid valve assembly. If all TFP Switch parameters change states
Inspect the channel plate, spacer plate, and filter plate for debris and blocked orifices.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, or programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Park/Neutral Signal	P0850/P0851	P0850/P0852	P0850/P0852

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 Volts = In-Gear, 0 Volts = Park/Neutral
Park/Neutral Signal	Park/Neutral	In-Gear	In-Gear

PNP Switch

The transmission manual shift shaft switch assembly, also known as the Internal Mode Switch (IMS), is a sliding contact switch attached to the manual shift shaft inside the transmission case. The Park/Neutral Position (PNP) Switch is integrated into the IMS and connects to the Transmission Control Module (TCM) lead-frame through a short wire harness. The circuit uses the TCM 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.

Ignition voltage is between 8-18 volts.
Engine speed is greater than 1000 RPM.

P0850 and P0851

The ECM detects the Park/Neutral switch signal equals 0 volts (Park/Neutral) when the IMS reports a Drive range for 0.2 second.
The throttle position is 10 percent or greater.
The engine torque is 75 N.m (55 lb ft) or greater.
The vehicle speed is 10 km/h (6 mph) or greater.

P0852

The ECM detects the Park/Neutral switch signal equals 12 volts (In-Gear) when the IMS reports a Park/Neutral range for 0.2 second.

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

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

Schematic Reference

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

If there are any other transmission DTCs set, diagnose those DTCs first. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
Perform the «Range Selector Lever Cable Adjustment»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle__range-selector-lever-cable-adjustment) procedure to verify proper adjustment.
Ignition ON, observe the scan tool ECM PNP Switch parameter while moving the gear shift lever from Park and through all ranges. The parameter should display Park/Neutral when in Park or Neutral and In-Gear when in Reverse or Drive.
Observe the scan tool TCM IMS A/B/C/P parameter while slowly moving the gear shift lever from Park through all ranges. The parameter should match each gear range that is selected. Refer to «Transmission Internal Mode Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-internal-mode-switch-logic) .
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, disconnect the 20-way harness connector at the transmission.
Connect the DT-47825-20 harness to the vehicle wire harness 20-way transmission connector.
Test for less than 10 ohms between the ground circuit terminal 18 at the DT-47825-20 harness and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Disconnect the DT-47825-20 harness from the vehicle wire harness 20-way transmission connector.
Remove the control valve body cover. Refer to «Control Valve Body Cover Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Connect the vehicle wire harness 20-way transmission electrical connector to the control solenoid valve assembly.
Disconnect the IMS connector at the control solenoid valve assembly.
Ignition ON, verify the scan tool ECM PNP Switch parameter displays In Gear. If not the specified value, test the Park/Neutral signal circuit for a short to ground. If the circuit tests normal, replace the engine control module.
Verify the scan tool TCM IMS A/B/C/P parameter displays HI for all four signal circuits. If not the specified value, replace the control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Connect a 3-amp fused jumper wire between Park/Neutral signal circuit terminal F and ground circuit terminal A on the control solenoid valve assembly. Verify the ECM PNP Switch parameter changes to Park/Neutral. If not the specified value, test the Park/Neutral signal circuit for an open/high resistance. If the circuit tests normal, replace the engine control module.
Connect a 3-amp fused jumper wire between each transmission range signal circuit terminal listed below and the IMS ground circuit, terminal A on the control solenoid valve assembly. Verify the corresponding scan tool TCM IMS A/B/C/P parameter displays LOW when terminal E, D, C, or B is connected to terminal A. Switch Signal A terminal E to ground circuit terminal A. Switch Signal B terminal D to ground circuit terminal A. Switch Signal C terminal C to ground circuit terminal A. Switch Signal P terminal B to ground circuit terminal A. If not the specified value, replace the control solenoid valve assembly.
If all circuits test normal, replace the transmission internal mode switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM or control solenoid valve assembly replacement, setup, and programming
«Range Selector Lever Cable Adjustment»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle__range-selector-lever-cable-adjustment)
«Control Valve Body Cover Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle)
«Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle)

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Transmission Fluid Pressure Switch 1 Signal	P0842	P0843	P0843
Transmission Fluid Pressure Switch 3 Signal	P0872	P0873	P0873
Transmission Fluid Pressure Switch 4 Signal	P0877	P0878	P0878
Transmission Fluid Pressure Switch 5 Signal	P0989	P0990	P0990

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 1 Signal	Low	High	High

Transmission Fluid Pressure Switch 1

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 3 Signal	Low	High	High

Transmission Fluid Pressure Switch 3

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 4 Signal	Low	High	High

Transmission Fluid Pressure Switch 4

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 5 Signal	Low	High	High

Transmission Fluid Pressure Switch 5

The transmission fluid pressure (TFP) switch 3 is part of the control solenoid valve assembly, which has no serviceable components. The transmission control module (TCM) supplies a signal circuit to the TFP switch 3. The TFP switch 3 has an internal case ground. The TFP switch 3 is normally closed or LOW. When oil pressure is present at the TFP 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 TCM monitors the TFP 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 TFP switch 3. When the 2-6 clutch is commanded ON, the 2-6 clutch regulator valve moves and pressure to the TFP switch 3 is exhausted through the 2-6 clutch regulator valve.

P0872 or P0873

DTC P0711, P0712, P0713, P0716, P0717, P0722, P0723, P0742, P0751, P0756, P0757, P0973, P0974, P0976, P0977, P1915, or P182E is not set.
High side driver is enabled.
Engine speed is 400 RPM or greater for 5 seconds.
Engine speed is 550 RPM or greater.
Ignition voltage is 8.6 volts or greater.
Transmission fluid temperature (TFT) is 0 to +120°C (32-248°F).

P0872

The TCM detects that the TFP switch 3 signal voltage remains LOW after the 2-6 clutch transitions from a HIGH pressure state to a LOW pressure state. The TCM counts each incident. The DTC sets when 18 counts are accumulated.

P0873

The TCM detects that the TFP switch 3 signal voltage remains HIGH after the 2-6 clutch transitions from a LOW pressure state to a HIGH pressure state. The TCM counts each incident. The DTC sets when 20 counts are accumulated.

DTCs P0872 and P0873 are Type C DTCs.
TCM freezes transmission adaptive functions for the 2-6 clutch.

DTCs P0872 and P0873 are Type C DTCs.

Schematic Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

«Transmission General Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation__transmission-general-description)
«Electronic Component Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation) for control solenoid valve assembly

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Engine idling in Park with parking brake applied, and drive wheels chocked.
Verify with a scan tool the TFP 1, TFP Switch 3, TFP Switch 4, and TFP Switch 5 parameter states are correct for the Park, Reverse, and Neutral gear select lever positions. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) . If any parameter value is not correct for a given gear range Refer to Circuit/System Testing below. If parameter values are correct for all gear ranges
Verify the TFP Switch 1, TFP Switch 3, TFP Switch 4, and TFP Switch 5 parameter states are correct for each forward range with the gear select lever in Drive, using the scan tool to command all forward ranges. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) . If any parameter value is not correct for a given gear range Refer to Circuit/System Testing below. If parameter values are correct for all gear ranges
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF. Remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
Ignition ON, verify with a scan tool that the TFP Switch 1, TFP Switch 3, TFP Switch 4, and TFP Switch 5 parameters change states when gently pushing on each TFP switch with the eraser end of a pencil. If any TFP Switch parameter does not change states Replace the Q8 control solenoid valve assembly. If all TFP Switch parameters change states
Inspect the channel plate, spacer plate, and filter plate for debris and blocked orifices.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, or programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Transmission Fluid Pressure Switch 1 Signal	P0842	P0843	P0843
Transmission Fluid Pressure Switch 3 Signal	P0872	P0873	P0873
Transmission Fluid Pressure Switch 4 Signal	P0877	P0878	P0878
Transmission Fluid Pressure Switch 5 Signal	P0989	P0990	P0990

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 1 Signal	Low	High	High

Transmission Fluid Pressure Switch 1

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 3 Signal	Low	High	High

Transmission Fluid Pressure Switch 3

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 4 Signal	Low	High	High

Transmission Fluid Pressure Switch 4

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 5 Signal	Low	High	High

Transmission Fluid Pressure Switch 5

The transmission fluid pressure (TFP) switch 4 is part of the control solenoid valve assembly which has no serviceable components. The transmission control module (TCM) supplies a signal circuit to the TFP switch 4. The TFP switch 4 has an internal case ground. TFP switch 4 is normally closed or LOW. When oil pressure is present at the TFP 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 TCM monitors the TFP 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 TFP 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 TFP switch 4 is exhausted through the 1-2-3-4 clutch regulator valve.

P0877 or P0878

DTC P0711, P0712, P0713, P0716, P0717, P0722, P0723, P0742, P0751, P0756, P0757, P0973, P0974, P0976, P0977, P1915, or P182E is not set.
High side driver is enabled.
Engine speed is 400 RPM or greater for 5.0 seconds.
Engine speed is 550 RPM or greater.
Ignition voltage is 8.6 volts or greater.
Transmission fluid temperature (TFT) is 0 to +120°C (32-248°F).

P0877

The TCM detects that the TFP 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 TCM counts each incident. The DTC sets when 5 counts are accumulated.

P0878

The TCM detects that the TFP 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 TCM counts each incident. The DTC sets when 8 counts are accumulated.

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

DTCs P0877 and P0878 are Type C DTCs.

Schematic Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

«Transmission General Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation__transmission-general-description)
«Electronic Component Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation) for control solenoid valve assembly

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Engine idling in Park with parking brake applied, and drive wheels chocked.
Verify with a scan tool the TFP Switch 1, TFP Switch 3, TFP Switch 4, and TFP Switch 5 parameter states are correct for the Park, Reverse, and Neutral gear select lever positions. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) . If any parameter value is not correct for a given gear range Refer to Circuit/System Testing below. If the parameter values are correct for all gear ranges
Verify the TFP Switch 1, TFP Switch 3, TFP Switch 4, and TFP Switch 5 parameter states are correct for each forward range with the gear select lever in Drive, using the scan tool to command all forward ranges. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) If any parameter value is not correct for a given gear range Refer to Circuit/System Testing below. If the parameter values are correct for all gear ranges
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF. Remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
Ignition ON, verify with a scan tool that the TFP Switch 1, TFP Switch 3, TFP Switch 4, and TFP Switch 5 parameters change states when gently pushing on each TFP switch with the eraser end of a pencil. If any TFP Switch parameter does not change states Replace the Q8 control solenoid valve assembly. If all TFP Switch parameters change states
Inspect the channel plate, spacer plate, and filter plate for debris and blocked orifices.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, or programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Line PC Solenoid Control	P0962	P0963	P0963	P0961

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Line PC Solenoid Control				Fault or Malfunction

Line Pressure Control Solenoid Valve Performance Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Line PC Solenoid Control	Fault or Malfunction

Line Pressure Control Solenoid Valve Control Circuit Low Voltage Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Line PC Solenoid Control		Fault or Malfunction	Fault or Malfunction

Line Pressure Control Solenoid Valve Control Circuit High Voltage Test Status

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

Engine speed is 400 RPM or greater for 5.0 seconds.
Ignition voltage is 8.6 volts or greater.

P0961

TCM detects an internal electrical malfunction of the line PC solenoid where the measured line PC solenoid current does not equal the commanded line PC solenoid current for 5.0 seconds.

P0962

TCM detects a short to ground on the line PC solenoid control circuit for 1 seconds.

P0963

TCM detects an open or a short to voltage on the line PC solenoid control circuit for 1 seconds.

P0961 or P0963

DTCs P0961 and P0963 are Type C DTCs.
TCM freezes transmission adaptive functions.
TCM commands maximum line pressure.

P0962

DTC P0962 is a Type A DTC.
TCM limits the transmission to Reverse and 3rd or 5th gear operation.
TCM inhibits the torque converter clutch (TCC).
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM turns the HSD OFF.
TCM inhibits Tap Up/Down function.
TCM inhibits neutral idle.
TCM inhibits manual shifting of forward gears.
TCM enables torque management.

DTCs P0961 and P0963 are Type C DTCs.
DTC P0962 is a Type A DTC.

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Engine running in Park position. Move the gear shift lever into each gear position and back into Park position. Verify with a scan tool the following test status parameters display OK: Line PC Sol. Perf. Test Status Line PC Sol. Ckt. High Voltage Test Status Line PC Sol. Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Refer to Circuit/System Testing below. If all test status parameters display OK
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) . The Q8 control solenoid valve assembly must be externally cleaned of all debris.
Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
Ignition ON, verify with a scan tool the following test status parameters display OK: Line PC Sol. Perf. Test Status Line PC Sol. Ckt. High Voltage Test Status Line PC Sol. Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Replace the Q8 control solenoid valve assembly. If all test status parameters display OK
All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Pressure Control Solenoid Valve 2 Control	P0966	P0967	P0967	P0965

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 2 Control				Fault or Malfunction

Pressure Control Solenoid Valve 2 Performance Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 2 Control	Fault or Malfunction

Pressure Control Solenoid Valve 2 Control Circuit Low Voltage Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 2 Control		Fault or Malfunction	Fault or Malfunction

Pressure Control Solenoid Valve 2 Control Circuit High Voltage Test Status

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

P0965

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P0965 is not set.

P0966

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P0966 is not set.

P0967

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P0967 is not set.

P0965

TCM detects an internal electrical performance malfunction of the clutch PC solenoid 2 control circuit where the measured clutch PC solenoid 2 current does not equal the commanded clutch PC solenoid 2 current for 5 seconds.

P0966

TCM detects a short to ground on the clutch PC solenoid 2 control circuit for 1 second.

P0967

TCM detects an open or short to voltage on the clutch PC solenoid 2 control circuit for 1 second.

P0965

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

P0966

DTC P0966 is a Type A DTC.
TCM limits the transmission to Reverse and 3rd or 5th gear operation.
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM turns the HSD OFF.
TCM forces the torque converter clutch (TCC) OFF.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM inhibits neutral idle.

P0967

DTC P0967 is a Type A DTC.
TCM limits the transmission to Reverse and 3rd gear operation.
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM inhibits Tap Up/Down function.
TCM inhibits neutral idle.
TCM inhibits manual shifting of forward gears.

DTC P0965 is a Type C DTC.
DTCs P0966 and P0967 are Type A DTCs.

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Operate the vehicle in second gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature, then operate the vehicle in Park for 5 seconds.
Operate the vehicle in Drive range. Allow the transmission to shift through all forward gear ranges. Verify with a scan tool the following test status parameters display OK: PC Sol. 2 Perf. Test Status PC Sol. 2 Ckt. High Voltage Test Status PC Sol. 2 Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Refer to Circuit/System Testing below. If all test status parameters display OK
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) . The Q8 control solenoid valve and transmission control module assembly must be externally cleaned of all debris.
Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
Ignition ON, verify with a scan tool the following test status parameters display OK: PC Sol. 2 Perf. Test Status PC Sol. 2 Ckt. High Voltage Test Status PC Sol. 2 Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Replace the Q8 control solenoid valve assembly. If all test status parameters display OK
All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Pressure Control Solenoid Valve 3 Control	P0970	P0971	P0971	P0969

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 3 Control				Fault or Malfunction

Pressure Control Solenoid Valve 3 Performance Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 3 Control	Fault or Malfunction

Pressure Control Solenoid Valve 3 Control Circuit Low Voltage Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 3 Control		Fault or Malfunction	Fault or Malfunction

Pressure Control Solenoid Valve 3 Control Circuit High Voltage Test Status

The clutch pressure (PC) solenoid 3 is part of the control solenoid valve assembly, which has no serviceable components. The normally high clutch PC solenoid 3 regulates and directs the clutch PC solenoid 3 oil pressure to the R1/4-5-6 clutch regulator valve and 4-5-6 clutch boost valve. Increasing clutch PC solenoid 3 oil pressure increases oil pressure to the low and reverse clutch or the 4-5-6 clutch, depending on the position of the clutch select valve 2. The transmission control module (TCM) varies the current to the PC solenoid 3 through a low side driver. Decreasing the current to the clutch PC solenoid 3 increases clutch PC solenoid 3 oil pressure by closing OFF the solenoid exhaust port. Increasing the current to the clutch PC solenoid 3, decreases clutch PC solenoid 3 oil pressure by opening the solenoid exhaust port. Clutch PC solenoid 3 power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuit and components from excessive current flow. If excessive current flow is detected, the HSD will turn OFF. When the fault is corrected the HSD will reset.

P0969

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P0969 is not set.

P0970

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P0970 is not set.

P0971

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P0971 is not set.

P0969

TCM detects an internal electrical performance malfunction of the clutch PC solenoid 3 control circuit where the measured clutch PC solenoid 3 currents does not equal the commanded clutch PC solenoid 3 current for 5 seconds.

P0970

TCM detects a short to ground on the clutch PC solenoid 3 control circuit for 1 second.

P0971

TCM detects an open or short to voltage on the clutch PC solenoid 3 control circuit for 1 second.

P0969

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

P0970 or P0971

DTCs P0970 and P0971 are Type A DTCs.
TCM limits the transmission to Reverse and 3rd or 5th gear operation.
TCM inhibits the torque converter clutch (TCC).
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM turns the HSD OFF.
TCM inhibits neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.

DTC P0969 is a Type C DTC.
DTCs P0970 and P0971 are Type A DTCs.

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Operate the vehicle in second gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature, then operate the vehicle in Park for 5 seconds.
Operate the vehicle in Drive range. Allow the transmission to shift through all forward gear ranges. Verify with a scan tool the following test status parameters display OK: PC Sol. 3 Perf. Test Status PC Sol. 3 Ckt. High Voltage Test Status PC Sol. 3 Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Refer to Circuit/System Testing below. If all test status parameters display OK
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) . The Q8 control solenoid valve and transmission control module assembly must be externally cleaned of all debris.
Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
Ignition ON, verify with a scan tool the following test status parameters display OK: PC Sol. 3 Perf. Test Status PC Sol. 3 Ckt. High Voltage Test Status PC Sol. 3 Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Replace the Q8 control solenoid valve assembly. If all test status parameters display OK
All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Shift Solenoid 1 Control	P0973	P0974	P0974

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Ignition ON Parameter Normal Range: OK
Shift Solenoid 1 Control			Fault or Malfunction

Shift Solenoid Valve 1 Control Circuit High Voltage Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Ignition ON Parameter Normal Range: OK
Shift Solenoid 1 Control		Fault or Malfunction

Shift Solenoid Valve 1 Control Circuit Open Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Ignition ON Parameter Normal Range: OK
Shift Solenoid 1 Control	Fault or Malfunction

Shift Solenoid Valve 1 Control Circuit Low Voltage Test Status

The shift solenoid (SS) 1 is part of the control solenoid valve assembly, which has no serviceable components. SS 1 is a normally closed (NC) ON/OFF solenoid and is controlled by the transmission control module (TCM) through a low side driver. When the SS 1 is energized (ON), SS 1 fluid pressure is directed to the clutch select valve 2, which allows the valve to overcome the spring pressure and move to the applied position. Power to the SS 1 is supplied by the TCM through a high side driver (HSD). The HSD protects the circuit and components from excessive current flow. If excessive current flow is detected, the HSD will turn OFF. When the fault is corrected, the HSD will reset.

P0973

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P0973 is not set.

P0974

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P0974 is not set.

P0973

TCM detects a short to ground on the SS 1 control circuit for 2 seconds.

P0974

TCM detects an open or a short to power on the SS 1 control circuit for 2 seconds.

P0973

DTC P0973 is a Type A DTC.
TCM limits the transmission to Reverse and 3rd gear operation.
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM forces TCC OFF.
TCM forces the HSD OFF.
TCM inhibits neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.

P0974

DTC P0974 is a Type B DTC.
TCM inhibits 1st gear.
TCM inhibits neutral idle.

DTC P0973 is a Type A DTC.
DTC P0974 is a Type B DTC.

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Operate the vehicle in second gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature, then operate the vehicle in Park for 5 seconds.
Place the gear selector in Reverse for 5 seconds and then idle the vehicle in Park for 5 seconds. Verify with a scan tool the following test status parameters display OK: Shift Sol. 1 Ctrl. Ckt. High Voltage Test Status Shift Sol. 1 Ctrl. Ckt. Open Test Status Shift Sol. 1 Ctrl. Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Refer to Circuit/System Testing below. If all test status parameters display OK
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) . The Q8 control solenoid valve and transmission control module assembly must be externally cleaned of all debris.
Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
Ignition ON, verify with a scan tool the following test status parameters display OK: Shift Sol. 1 Ctrl. Ckt. High Voltage Test Status Shift Sol. 1 Ctrl. Ckt. Open Test Status Shift Sol. 1 Ctrl. Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Replace the Q8 control solenoid valve assembly. If all test status parameters display OK
All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Shift Solenoid (SS) 2 Control	P0976	P0977	P0977

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Ignition ON Parameter Normal Range: OK
Shift Solenoid 2 Control			Fault or Malfunction

Shift Solenoid Valve 2 Control Circuit High Voltage Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Ignition ON Parameter Normal Range: OK
Shift Solenoid 2 Control		Fault or Malfunction

Shift Solenoid Valve 2 Control Circuit Open Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Ignition ON Parameter Normal Range: OK
Shift Solenoid 2 Control	Fault or Malfunction

Shift Solenoid Valve 2 Control Circuit Low Voltage Test Status

The shift solenoid (SS) 2 is part of the control solenoid valve assembly, which has no serviceable components. SS 2 is a normally closed (NC) ON/OFF solenoid and is controlled by the transmission control module (TCM) through a low side driver. When the SS 2 is energized, ON, SS 2 fluid pressure is directed to the clutch select valve 3, which allows the valve to overcome the spring pressure and move to the applied position. Power to the SS 2 is supplied by the TCM through a high side driver (HSD). The HSD protects the circuit and components from excessive current flow. If excessive current flow is detected, the HSD will turn OFF. When the fault is corrected, the HSD will reset.

P0976

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P0976 is not set.

P0977

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P0977 is not set.

P0976

TCM detects a short to ground on the SS 2 control circuit for 2 seconds.

P0977

TCM detects an open or short to power on the SS 2 control circuit for 2 seconds.

P0976

DTC P0976 is a Type B DTC.
TCM freezes transmission adaptive functions.
TCM commands maximum line pressure.

P0977

DTC P0977 is a Type A DTC.
TCM limits the transmission to Reverse and 3rd or 5th gear operation.
TCM forces TCC OFF.
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM turns the HSD OFF.
TCM inhibits neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.

DTC P0976 is a Type B DTC.
DTC P0977 is a Type A DTC.

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Operate the vehicle in 3rd gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature.
Place the gear selector in Reverse for 5 seconds and then idle the vehicle in Park for 5 seconds. Verify with a scan tool the following test status parameters display OK: Shift Sol. 2 Ctrl. Ckt. High Voltage Test Status Shift Sol. 2 Ctrl. Ckt. Open Test Status Shift Sol. 2 Ctrl. Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Refer to Circuit/System Testing below. If all test status parameters display OK
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) . The Q8 control solenoid valve and transmission control module assembly must be externally cleaned of all debris.
Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
Ignition ON, verify with a scan tool the following test status parameters display OK: Shift Sol. 2 Ctrl. Ckt. High Voltage Test Status Shift Sol. 2 Ctrl. Ckt. Open Test Status Shift Sol. 2 Ctrl. Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Replace the Q8 control solenoid valve assembly. If all test status parameters display OK
All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
TFP Switch 1 Signal	P0842	P0843	P0843
TFP Switch 3 Signal	P0872	P0873	P0873
TFP Switch 4 Signal	P0877	P0878	P0878
TFP Switch 5 Signal	P0989	P0990	P0990

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 1 Signal	Low	High	High

Transmission Fluid Pressure Switch 1

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 3 Signal	Low	High	High

Transmission Fluid Pressure Switch 3

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 4 Signal	Low	High	High

Transmission Fluid Pressure Switch 4

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 12 volts = High, 0 volts = Low
Transmission Fluid Pressure Switch 5 Signal	Low	High	High

Transmission Fluid Pressure Switch 5

The transmission fluid pressure (TFP) switch 5 is part of the control solenoid valve assembly, which has no serviceable components. The transmission control module (TCM) supplies a signal circuit to the TFP switch 5. The TFP switch 5 has an internal case ground. TFP switch 5 is normally closed or LOW. When oil pressure is present at the TFP switch 5, the switch is open or HIGH. The normally high pressure control (PC) solenoid 3 controls pressure to the R1/4-5-6 clutch regular valve. The TCM monitors the TFP switch 5 signal circuit to determine the position of the R1/4-5-6 clutch regulator valve. When the low and reverse clutch and 4-5-6 clutch are commanded OFF, pressure is present on the TFP switch 5. When the low and reverse clutch or the 4-5-6 clutch is commanded ON, the R1/4-5-6 clutch regulator valve moves and pressure to the TFP switch 5 is exhausted through the R1/4-5-6 clutch regulator valve.

DTC P0989 or P0990

DTC P0711, P0712, P0713, P0716, P0717, P0722, P0723, P0742, P0751, P0756, P0757, P0973, P0974, P0976, P0977, P182E, or P1915 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Engine speed is 550 RPM or greater.
Ignition voltage is 8.6 volts or greater.
Transmission fluid temperature (TFT) is 0 to +120°C (32-248°F).
High side driver (HSD) is enabled.

P0989

The TCM detects that the TFP switch 5 signal voltage remains LOW after the low and reverse clutch or the 4-5-6 clutch transitions from a HIGH pressure state to a LOW pressure state. The TCM counts each incident. The DTC sets when 18 counts are accumulated.

P0990

The TCM detects that the TFP switch 5 signal voltage remains HIGH after the low and reverse clutch or the 4-5-6 clutch transitions from a LOW pressure state to a HIGH pressure state. The TCM counts each incident. The DTC sets when 15 counts are accumulated.

DTCs P0989 and P0990 are Type C DTCs.
TCM freezes transmission adaptive functions for the reverse and low clutch and the 4-5-6 clutch.

DTCs P0989 and P0990 are Type C DTCs.

Schematic Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Description and Operation

«Transmission General Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation__transmission-general-description)
«Electronic Component Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation) for control solenoid valve assembly

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Engine idling in Park with parking brake applied, and drive wheels chocked.
Verify with a scan tool the TFP Switch 1, TFP Switch 3, TFP Switch 4, and TFP Switch 5 parameter states are correct for the Park, Reverse, and Neutral gear select lever positions. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) . If any parameter value is not correct for a given gear range Refer to Circuit/System Testing below. If the parameter values are correct for all gear ranges
Verify the TFP Switch 1, TFP Switch 3, TFP Switch 4, and TFP Switch 5 parameter states are correct for each forward range with the gear select lever in Drive, using the scan tool to command all forward ranges. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) If any parameter value is not correct for a given gear range Refer to Circuit/System Testing below. If the parameter values are correct for all gear ranges
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF. Remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
Ignition ON, verify with a scan tool that the TFP Switch 1, TFP Switch 3, TFP Switch 4, and TFP Switch 5 parameters change states when gently pushing on each TFP switch with the eraser end of a pencil. If any TFP Switch parameter does not change states Replace the Q8 control solenoid valve assembly. If all TFP Switch parameters change states
Inspect channel plate, spacer plate, and filter plate for debris and blocked orifices.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, or programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

To improve vehicle 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 speed or 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 P150C to set.

Engine is running.

ECM detects greater than 2 message count errors.

ECM disables engine speed and torque requests from TCM.
DTC P150C is a type B DTC.

DTC P150C is a type B DTC.

Description and Operation

Data Link Communications Description and Operation

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

DTC P150C is an informational DTC. Diagnose all other K20 Engine Control module DTCs prior to DTC P150C. If other K20 engine control module DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) . If no other K20 engine control module DTCs are set Diagnosis is accomplished by looking for an intermittent CAN circuit fault. Refer to «Scan Tool Does Not Communicate with High Speed GMLAN Device»(/buick/enclave/i-2007-2013/remont/communication-devices/#data-communications-system) .
Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. 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, refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming.

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The shift solenoid (SS) 1 is part of the control solenoid valve assembly, which has no serviceable components. SS 1 provides fluid pressure to control the operation of the clutch select valve 2, which is located in the control valve lower body assembly. SS 1, in conjunction with clutch select valve 2, controls the pressure path to the reverse and low clutch and 4-5-6 clutch. A diagnostic test is performed by the transmission control module (TCM) to determine the state of the clutch select valve 2. During this diagnostic test, the TCM commands the SS 1 ON, supplying pressure to move the clutch select valve 2 toward its spring. At the same time, line pressure is elevated slightly to assist the spring side pressure. If the spring is broken, or the clutch select valve 2 cannot move due to another mechanical condition, the DTC will set.

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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, P0741, P0742, P1751, P2763, or P2764 is not set.
Current gear is not 2nd.
Engine speed is greater than 400 RPM for greater than 5 seconds.
Ignition voltage is 8.6 volts or greater.
Transmission fluid temperature (TFT) is 20-130°C (68-266°F).
Calculated throttle position was 8 percent or greater, and has not dropped below 3 percent.
Engine torque signal is valid.
Throttle position sensor signal is valid.
Engine torque is greater than 80 N.m (59 lb ft).
Transmission input speed was 1200 RPM or greater and has not dropped below 900 RPM.
Upshift or downshift is not in process.

The TCM detects attained gear slip is 100 RPM or greater for 1 second.

DTC P1751 is a Type B DTC.

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine idling in Park, with parking brake applied and drive wheels chocked.
Perform the «Transmission Fluid Level and Condition Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) to verify correct fluid level and condition.
Ignition ON, clear the TCM DTCs.
Perform the «Road Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__road-test) . Verify the transmission operation performs as indicated in the road test instructions and that DTC P1751 did not set. If DTC P1751 sets Refer to Circuit/System Testing below. If DTC P1751 did not set
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Verify the transmission line pressures are within the range specified in the Line PC Solenoid Valve Pressure table. Refer to «Line Pressure Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) , and «Solenoid Valve Pressure»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__solenoid-valve-pressure) . If line pressures are not within the specified ranges Refer to «Fluid Pressure High or Low»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__fluid-pressure-high-or-low) . If line pressures are within the specified ranges
Ignition OFF, remove the control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . A pressure change should occur for each solenoid valve. If a pressure change does not occur for each solenoid Replace the Q8 control solenoid valve assembly. If a pressure change occurs for each solenoid
Listed in the chart below, are conditions for each component that could set DTC P1751. Carefully inspect each component for that condition. Repair or replace as necessary.

DTC	Component	Condition
P1751	Upper Control Valve Body Assembly (349)	Clutch select valve 2 - spring broken, debris, valve stuck, binding, damaged valve, or scored bore
P1751	Upper Control Valve Body Assembly (349)	#4 check ball for irregularities
P1751	Upper Spacer Plate	Orifice # 14 blocked, obstructed, or irregular shaped
P1751	Control Solenoid Valve Assembly (314)	SS1 Stuck ON/OFF Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal

Note. Perform the Reset Transmission Adapts following all transmission related repairs.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Valve Upper Body Assembly Cleaning and Inspection

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

A signal circuit is provided by the body control module (BCM) to the resistor network embedded in the plus or minus buttons. When a plus or minus button is pressed, a corresponding voltage drop occurs across the resistor network. This voltage drop is monitored by the BCM. The BCM will send the request to the transmission control module (TCM) to perform the upshift or downshift. The TCM is constantly monitoring the serial data sent from the BCM for the correct number and sequence of counts for Tap Up and Tap Down function.

The TCM rolling counter diagnostic is enabled.
The Tap Up and Tap Down health message health is received from the BCM.
The ignition voltage is 8.6 volts or greater.
The engine speed is 500 RPM or greater for at least 5 seconds.

The TCM detects an error in the rolling count value that does not match with the BCM count, within 10 seconds.

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

DTC P1761 is a Type C DTC.

Schematic Reference

«Automatic Transmission Controls Schematics»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-wiring-schematic-diagrams)
«Data Communication Schematics»(/buick/enclave/i-2007-2013/remont/communication-devices/#data-communications-system)
«Body Control System Schematics»(/buick/enclave/i-2007-2013/remont/communication-devices/#data-communications-system)

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

DTC P1761 is an informational DTC. Diagnose all other body control module DTCs prior to DTC P1761. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
If there are no other body control DTCs, diagnosis is accomplished by looking for an intermittent CAN circuit fault. Refer to «Scan Tool Does Not Communicate with High Speed GMLAN Device»(/buick/enclave/i-2007-2013/remont/communication-devices/#data-communications-system) .
Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Perform the «Reset Transmission Adapts»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
Perform the «Diagnostic Repair Verification»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-repair-verification) after completing the diagnostic procedure.

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

A signal circuit is provided by the body control module (BCM) to the Tow/Haul switch. When tow/haul mode is pressed, the tow/haul switch input signal to the BCM is momentarily toggled to zero volts. The BCM is constantly sending the transmission control module (TCM) serial data messages with information regarding the status of the Tow/Haul switch. This signals the transmission control module (TCM) to change the shift points, the application of TCC, and transmission line pressure. The TCM sets this DTC when it detects a discrepancy in the structure of this message causing its integrity to be questioned.

The TCM rolling counter diagnostic is enabled.
The Tow/Haul message health is received from the BCM.
The ignition voltage is 8.6 volts or greater.
The engine speed is 400 RPM or greater for 5 seconds.

The TCM detects an error in the rolling count value that does not match with the BCM count, 3 times within 10 seconds.

DTC P1762 is a type C DTC.

If the electrical circuit tests are OK and the shift pattern is not occurring, there may be a mechanical/hydraulic condition that prevents operation. Refer to Symptoms - Automatic Transmission .

Schematic Reference

«Automatic Transmission Controls Schematics»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-wiring-schematic-diagrams)
«Data Communication Schematics»(/buick/enclave/i-2007-2013/remont/communication-devices/#data-communications-system)
«Body Control System Schematics»(/buick/enclave/i-2007-2013/remont/communication-devices/#data-communications-system)

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

DTC P1762 is an informational DTC. Diagnose all other body control module DTCs prior to DTC P1762. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
If there are no other body control DTCs, diagnosis is accomplished by looking for an intermittent CAN circuit fault. Refer to «Scan Tool Does Not Communicate with High Speed GMLAN Device»(/buick/enclave/i-2007-2013/remont/communication-devices/#data-communications-system) .
Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Perform the «Reset Transmission Adapts»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__reset-transmission-adapts) following all transmission related repairs.
Perform the «Diagnostic Repair Verification»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-repair-verification) after completing the diagnostic procedure.

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Transmission Range Signal A	P182E	P1915	P1915	P182E, P1915
Transmission Range Signal B	P1915	P182E	P182E	P182E, P1915
Transmission Range Signal C	P1915	P182E	P182E	P182E, P1915
Transmission Range Signal P	P182E	P1915	P1915	P182E, P1915
Ground		P182E	P182E	P182E, P1915

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Ignition ON, range selector in Park Parameter Normal Range: High/Low
Transmission Range Switch Signal A	Low	High	High
Transmission Range Switch Signal B	Low	High	High
Transmission Range Switch Signal C	Low	High	High
Transmission Range Switch Signal P	Low	High	High

Internal Mode Switch A/B/C/P

The manual shift detent lever with shaft position switch assembly, or internal mode switch (IMS) assembly, is a sliding contact switch attached to the manual shift detent lever within the transmission. The 4 inputs to the transmission control module (TCM), from the switch, indicate the position selected by the transmission manual shaft. The input voltage at the TCM 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 as IMS A/B/C/P. The IMS input parameters represented are transmission range Signal A, Signal B, Signal C, and Signal P.

P182E

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, P0307, P0308, P0401, P042E, P0722, or P0723 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
Engine torque signal is valid.

P1915

DTC P0722, P0723, or P1915 is not set.
Transmission output shaft speed is 90 RPM or less.
Ignition voltage was 5.0 volts or greater, and has not dropped below 2.0 volts.

P182E

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

P1915

IMS does not indicate Park or Neutral during the following sequence

Engine speed is 50 RPM or less for 0.25 seconds or greater.
Engine speed is 50-480 RPM for 0.07 seconds or greater.
Engine speed is 525 RPM or greater and the transmission input speed is 200 RPM or greater for 1.25 seconds.

DTCs P182E and P1915 are Type A DTCs.
TCM commands maximum line pressure.
TCM forces the torque converter clutch (TCC) OFF.
TCM turns all the solenoids OFF.
TCM freezes transmission adaptive functions.
TCM limits the transmission to Reverse and 3rd or 5th gear operation.
TCM turns the high side driver (HSD) OFF.
TCM inhibits neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.

DTCs P182E and P1915 are Type A DTCs.

Schematic Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

«Transmission General Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation__transmission-general-description)
«Electronic Component Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation) for manual shift detent lever with shaft position switch assembly

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Perform the «Range Selector Lever Cable Adjustment»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle__range-selector-lever-cable-adjustment) procedure to verify proper adjustment.
Ignition ON.
Verify the scan tool TCM IMS A/B/C/P parameter values are correct with the gear shift lever in Park, Reverse, Neutral and all forward positions. Refer to «Transmission Internal Mode Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-internal-mode-switch-logic) If the IMS parameter does not display the correct values Refer to Circuit/System Testing below. If the IMS parameter displays the correct values
Verify the scan tool engine control module (ECM) PNP Switch parameter displays Park/Neutral with the gear shift lever in Park and Neutral and In Gear with the gear shift lever in Reverse and all forward positions. If the PNP Switch parameter does not display the correct values Refer to Circuit/System Testing below. If the PNP Switch parameter displays the correct values
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, remove the control valve body cover. Refer to «Control Valve Body Cover Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Connect the vehicle wire harness X1 20-way transmission connector to the Q8 control solenoid valve assembly.
Disconnect the B15 transmission internal mode switch connector X2 at the Q8 control solenoid valve assembly.
Ignition ON.
Verify the scan tool IMS A/B/C/P parameter displays High for all 4 signal circuits. If the IMS parameter does not display the correct values Replace the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) . If the IMS parameter displays the correct values
Verify the scan tool ECM PNP Switch parameter displays In Gear. If the PNP Switch parameter does not display In Gear Test the park/neutral signal circuit for a short to ground. If circuit is shorted to ground, repair the short to ground on the circuit. If circuit is not shorted to ground, replace the K20 engine control module. If the PNP Switch parameter displays In Gear
Verify the TCM IMS A/B/C/P parameter displays Low when a 3-amp fused jumper wire is connected between each transmission range signal circuit terminal listed below and the IMS ground circuit, terminal A on the Q8 control solenoid valve assembly X2 connector. Switch Signal A terminal E to ground circuit terminal A. Switch Signal B terminal D to ground circuit terminal A. Switch Signal C terminal C to ground circuit terminal A. Switch Signal P terminal B to ground circuit terminal A. If any IMS parameter does not display Low when the signal circuit is connected to ground Replace the Q8 control solenoid valve assembly. If all IMS parameters display Low when the signal circuit is connected to ground
Connect a 3-amp fused jumper wire between park/neutral switch signal circuit terminal F and IMS ground circuit terminal A on the Q8 control solenoid valve assembly X2 connector. Verify the ECM PNP Switch parameter changes from In Gear to Park/Neutral. If the ECM PNP Switch parameter does not display Park/Neutral when the signal circuit is connected to ground Test for less than 2 ohms in the park/neutral signal circuit, end to end. If 2 ohms or greater, repair the signal circuit. If less than 2 ohms, replace the K20 engine control module. If the ECM PNP Switch parameter displays Park/Neutral when the signal circuit is connected to ground
Replace the B15 transmission internal mode switch.

Note. Perform the Reset Transmission Adapts following all transmission related repairs. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection before replacing the TCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle)
«Range Selector Lever Cable Adjustment»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle__range-selector-lever-cable-adjustment)
«Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM or control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The TAP Shift system allows the driver to manually shift gears by using the TAP shift switches located on the automatic transmission shifter. Pushing the Up switch will command an upshift and pushing the Down switch will command a downshift. The TAP shift system is activated when the gear selector is in the L (M) position and is deactivated in all other positions.

If the transmission control module (TCM) detects TAP enable switch Active and the IMS switch does not indicate L (M), DTC P1876 sets. DTC P1876 is a type C DTC.

DTC P0815, P0816, or P0826, P1825, P1915 or U0100 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.

The Tap Up/Tap Down switch signal is Active when the IMS does not indicate L (M) for 2 seconds or greater 3 times during the same ignition cycle.

DTC P1876 is a Type C DTC.
TCM disables Tap shift functions.

DTC P1876 is a Type C DTC.

Schematic Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Connector End View Reference

Description and Operation

«Transmission General Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation__transmission-general-description)
«Electronic Component Description»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-description-and-operation)

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Verify there no transmission internal mode switch (IMS) DTCs set. If IMS DTCs were set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) . If IMS DTCs were not set
Ignition ON.
Verify the gear shift lever position matches the scan tool TCM Internal Mode Switch parameter while slowly moving the gear shift lever from Park through all ranges. If the displayed values are not correct Refer to «Range Selector Lever Cable Adjustment»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle__range-selector-lever-cable-adjustment) If the displayed values are correct
Verify the scan tool Driver Shift Control Mode parameter displays Inactive with the transmission shift lever the Park, Reverse, Neutral, and Drive, and active in the M manual mode position. If the Driver Shift Mode parameter does not display the correct values Refer to Circuit/System Testing below. If the Driver Shift Mode parameter displays the correct values
Shift lever in the M position, verify the scan tool Driver Shift Request parameter changes from None to Upshift when the plus button is pressed, and from None to Downshift when the minus button is pressed. If the Driver Shift Request parameter does not display the correct values Refer to Circuit/System Testing below. If the Driver Shift Request parameter displays the correct values
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, disconnect the harness connector from the S3 transmission shift lever.
Test for less than 10 ohms between the S3 transmission shift lever harness connector terminal 2 and ground. If greater than the specified range, repair the ground circuit.
Ignition ON.
Verify the scan tool Driver Shift Control parameter displays inactive. If Driver Shift Control Parameter does not display Inactive Test signal circuit for a short to power or ground. If signal circuit has a short to voltage or ground, repair the circuit. If signal circuit does not have a short to voltage or ground, replace the K9 body control module. If Driver Shift Control Parameter displays Inactive
Verify a test lamp illuminates between the S3 transmission shift lever harness connector ignition circuit terminal 1 and ground circuit terminal 2. If the test lamp does not illuminate Ignition OFF. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the ignition circuit If less than 2 ohms, replace the K9 body control module If the test lamp illuminates
Test for 11 volts or greater at the S3 transmission shift lever harness connector between signal circuit terminal 3 and ground. If less than 11 volts Ignition OFF. Test for less than 2 ohms in the signal circuit wire end to end. If 2 ohms or greater, repair the open/high resistance in the signal circuit wire. If less than 2 ohms, replace the K9 body control module. If 11 volts or greater
Ignition OFF, connect the S3 transmission shift lever harness connector, ignition ON.
Test for 11 volts or greater between the S3 transmission shift lever connector terminal 3 and ground in the park, reverse, neutral, and drive gear select lever positions by back probing the connector. If less than 11 volts Replace the S3 transmission shift lever. If 11 volts or greater
Test for 8.0-10.6 volts between the S3 transmission shift lever connector terminal 3 and ground with the shift lever in the M position. If not between 8.0-10.6 volts Replace the S3 transmission shift lever. If between 8.0-10.6 volts
Test for 5.1-7.3 volts between the S3 transmission shift lever connector terminal 3 and ground with the shift lever in the M position and the tap up button pressed. If not between 5.1-7.3 volts Replace the S3 transmission shift lever. If between 5.1-7.3 volts
Test for 2.0-4.6 volts between the S3 transmission shift lever connector terminal 3 and ground with the shift lever in the M position and the tap down button pressed. If not between 2.0-4.6 volts Replace the S3 transmission shift lever. If between 2.0-4.6 volts
Replace the K9 body control module

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Transmission Control Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) for AT TAP shift switch replacement.
«Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for body control module (BCM) or control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The clutch pressure control (PC) solenoid 4 is part of the control solenoid valve assembly which has no serviceable components. The PC 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 (TCM) calculates gear ratio based on the RPM signals from the input speed sensor (ISS) and the output speed sensor (OSS). The TCM compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear.

P2714

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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
Ignition voltage is 8.6 volts or greater.
Output speed is 16 RPM or greater, or throttle position is 0.4 percent or greater.
Throttle position signal is valid.
Engine speed is 400 RPM or greater for 5 seconds.
Transmission fluid temperature is 0°C (32°F) or greater.
High side driver (HSD) is enabled.

P2715

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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
HSD is enabled.
Transmission fluid temperature is 0°C (32°F) or greater.
Commanded and attained range is not 1st gear.

P2714

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

P2715

TCM 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

DTC P2714 is a Type A DTC.
TCM commands maximum line pressure.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM freezes transmission adaptive functions.
TCM inhibits neutral idle.
TCM limits the transmission to Reverse and 1st or 3rd gear operation.

P2715

DTC P2715 is a Type A DTC.
TCM commands maximum line pressure.
TCM inhibits neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM freezes transmission adaptive functions.
TCM limits the transmission to Reverse and 2nd gear operation.

DTCs P2714 and P2715 are Type A DTCs.

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine idling in Park, with parking brake applied and drive wheels chocked.
Verify correct transmission fluid level and condition. Refer to «Transmission Fluid Level and Condition Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) .
Verify with a scan tool the TFP Switch 3 parameter values are correct for the Park, Reverse, and Neutral gear selector positions. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) . If not the correct values for TFP Switch 3 Refer to Circuit/System Testing below. If TFP Switch 3 values are correct
Place the gear select lever in Drive range. Verify the TFP Switch 3 parameter states are correct for all forward ranges when commanded with a scan tool. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) . If not the correct values for TFP Switch 3 Refer to Circuit/System Testing below. If TFP Switch 3 values are correct
Ignition ON, clear the TCM DTCs
Perform the «Road Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__road-test) . Verify the transmission operation performs as indicated in the road test instructions and DTC P2714 or P2715 did not set. If DTC P2714 or P2715 sets Refer to Circuit/System Testing below. If DTC P2714 or P2715 did not set
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Verify the transmission line pressures are within the ranges specified in the Line PC Solenoid Valve Pressure table. Refer to «Line Pressure Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) , and «Solenoid Valve Pressure»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__solenoid-valve-pressure) . If line pressures are not within the specified ranges Refer to «Fluid Pressure High or Low»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__fluid-pressure-high-or-low) . If line pressures are within the specified ranges
Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . Test all solenoids on the Q8 control solenoid valve assembly. A pressure change should occur for each solenoid valve. If a pressure change does not occur for each solenoid Replace the Q8 control solenoid valve assembly. If a pressure change occurs for each solenoid
Listed in the table below, are conditions for each component that could set DTC P2714 or P2715. Carefully inspect each component for that condition. Repair or replace as necessary.

DTCs	Component	Condition
P2714 P2715	Control Valve Upper Body Assembly (349)	2-6 clutch regulator valve (334) and (333) stuck/sticking - debris, binding, damaged valve, or scored bore
P2714	Lower Control Valve Body Assembly (374)	Actuator feed limit circuit supply fluid to solenoid restricted or not available - debris or sediment blockage
P2714	Channel Plate and Spacer Plate	Oil channels or orifices blocked by debris
P2714 P2715	Q8 Control Solenoid Valve Assembly (314)	Clutch pressure control solenoid 4 stuck On or stuck Off Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal Clutch pressure control solenoid 2 stuck Off
P2714 P2715	A/Trans Case Cover (403)	2-6 clutch return spring retaining ring (407) not seated in groove 2-6 clutch piston assembly (405) - seal damaged or leaking 2-6 clutch plates (446-447) worn or damaged
P2714	1-2-3-4 Clutch Plate Assembly (51)	2-6 clutch return spring retaining ring (407) not seated in groove 2-6 clutch piston assembly (405) - seal damaged or leaking 2-6 clutch plates (446-447) worn or damaged 1-2-3-4 clutch backing plate retaining ring (429) not seated/oriented correctly 1-2-3-4 clutch piston (414) - seals damaged or leaking 1-2-3-4 clutch piston (414) - cracked or damaged
P2714	A/Trans Fluid Pump Assembly (203)	Fluid pump housing/vanes/rotor/slide damaged/scored A/Trans pump fluid outlet seal assembly (57) damaged/leaking
P2714	A/Trans Fluid Filter Assembly (201)	Oil filter (201) or filter seal (202) loose or damaged

DTC P2714 or P2715

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Control Valve Lower Body and Upper Body Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle)
«Low and Reverse Clutch and 1-2-3-4 Clutch Plate Removal»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-off-vehicle)
«Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Clutch PC Solenoid 4 Control	P2720	P2721	P2721	P2719

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 4 Control				Fault or Malfunction

Pressure Control Solenoid Valve 4 Performance Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 4 Control	Fault or Malfunction

Pressure Control Solenoid Valve 4 Control Circuit Low Voltage Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 4 Control		Fault or Malfunction	Fault or Malfunction

Pressure Control Solenoid Valve 4 Control Circuit High Voltage Test Status

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

P2719

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P2719 is not set.

P2720

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P2720 is not set.

P2721

Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
DTC P2721 is not set.

P2719

TCM detects an internal electrical malfunction on the clutch PC solenoid 4 control circuit where the measured PC solenoid 4 current does not equal the commanded clutch PC solenoid 4 current for 5 seconds.

P2720

TCM detects a short to ground on the clutch PC solenoid 4 control circuit for 1 second.

P2721

TCM detects an open or short to voltage on the clutch PC solenoid 4 control circuit for 1 second.

P2719

DTC P2719 is a Type C DTC.
TCM freezes transmission adaptive functions on the 2-6 clutch.

P2720

DTC P2720 is a Type A DTC.
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM inhibits neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM limits the transmission to Reverse and 2nd gear operation.

P2721

DTC P2721 is a Type A DTC.
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM inhibits neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM limits the transmission to Reverse and 1st or 3rd gear operation.

DTC P2719 is a Type C DTC.
DTCs P2720 and P2721 are Type A DTCs.

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Operate the vehicle in second gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature, then operate the vehicle in Park for 5 seconds.
Operate the vehicle in Drive range. Allow the transmission to shift through all forward gear ranges. Verify with a scan tool the following test status parameters display OK: PC Sol. 4 Perf. Test Status PC Sol. 4 Ckt. High Voltage Test Status PC Sol. 4 Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Refer to Circuit/System Testing below. If all test status parameters display OK
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) . The Q8 control solenoid valve assembly must be externally cleaned of all debris.
Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
Ignition ON, verify with a scan tool the following test status parameters display OK: PC Sol. 4 Perf. Test Status PC Sol. 4 Ckt. High Voltage Test Status PC Sol. 4 Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Replace the Q8 control solenoid valve assembly. If all test status parameters display OK
All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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

P2723

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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
Ignition voltage is 8.6 volts or greater.
High side driver (HSD) is enabled.
Output speed is 16 RPM or greater, or the throttle position is 0.4 percent or greater.
Throttle position signal is valid.
Engine speed is 400 RPM or greater for 5 seconds.
Transmission fluid temperature (TFT) is 0°C (32°F) or greater.

P2724

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, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
Commanded or attained range is not 1st gear.
HSD is enabled.
TFT is 0°C (32°F) or greater.

P2723

TCM 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

TCM 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

DTC P2723 is a Type A DTC.
TCM freezes transmission adaptive functions.
TCM inhibits neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM limits the transmission to Reverse and fifth gear operation.

P2724

DTC P2724 is a Type A DTC.
TCM freezes transmission adaptive functions.
TCM commands maximum line pressure.
TCM inhibits neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM limits the transmission to Reverse, first, or third gear operation.

DTCs P2723 and P2724 are Type A DTCs.

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine idling in Park, with parking brake applied and drive wheels chocked.
Verify correct transmission fluid level and condition. Refer to «Transmission Fluid Level and Condition Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__transmission-fluid-level-and-condition-check) .
Verify with a scan tool the TFP Switch 4 parameter values are correct for the Park, Reverse, and Neutral gear selector positions. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) . If not the correct values for TFP Switch 4 Refer to Circuit/System below. If TFP Switch 4 values are correct
Gear select lever in Drive range. Verify the TFP Switch 4 parameter states are correct for all forward ranges when commanded with a scan too. Refer to «Transmission Fluid Pressure Switch Logic»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__transmission-fluid-pressure-switch-logic) . If not the correct values for TFP Switch 4 Refer to Circuit/system below. If TFP Switch 4 values are correct
Ignition ON, clear the DTCs from the TCM
Perform the «Road Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__road-test) . Verify the transmission operation performs as indicated in the road test instructions and DTC P2723 or P2724 did not set. If DTC P2723 or P2724 sets Refer to Circuit/System below. If DTC P2723 or P2724 did not set
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Verify the transmission line pressures are within the ranges specified in the Line PC Solenoid Valve Pressure table. Refer to «Line Pressure Check»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) , and «Solenoid Valve Pressure»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-specifications__solenoid-valve-pressure) . If line pressures are not within the specified ranges Refer to «Fluid Pressure High or Low»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__fluid-pressure-high-or-low) . If line pressures are within the specified ranges
Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures__control-solenoid-valve-and-transmission-control) . Test all solenoids on the Q8 control solenoid valve assembly. A pressure change should occur for each solenoid valve. If a pressure change does not occur for each solenoid Replace the Q8 control solenoid valve assembly. If a pressure change occurs for each solenoid
Listed in the table below, are conditions for each component that could set DTC P2723 or P2724. Carefully inspect each component for that condition. Repair or replace as necessary.

DTCs	Component	Condition
P2723	Control Valve Upper Body Assembly (349)	Manual shift detent (w/shaft position switch) lever assembly not engaged with manual shaft
P2723	Control Valve Upper Body Assembly (349)	Clutch select valve 3 (345) stuck Off - debris, binding, damaged valve, or scored bore
P2723 P2724	Lower Control Valve Body Assembly (374)	Actuator feed limit circuit supply fluid to solenoid restricted or not available - debris or sediment blockage 1-2-3-4 clutch boost valve (369) - binding or scored bore - can cause harsh shifts 1-2-3-4 clutch regulator valve (372) stuck/sticking - debris, binding, damaged valve, or scored bore
P2723 P2724	Q8 Control Solenoid Valve Assembly (314)	Clutch pressure control solenoid 5 stuck On or stuck Off Clutch pressure control solenoid 2 stuck Off - P2724 Control solenoid filter plate assembly blocked, or damaged gasket seal
P2723	Channel Plate and Spacer Plate	Oil channels or orifices blocked by debris
P2723	1-2-3-4 Clutch Assembly (51)	1-2-3-4 clutch piston (414) cracked/damaged/leaking
P2723	1-2-3-4 Clutch Assembly (51)	1-2-3-4 clutch backing plate retaining ring (429) not seated/oriented, causing clutch pack/piston overtravel
P2723	Low and Reverse Clutch Assembly (OWC)	OWC (455) will not hold torque OWC (455) friction plate support face cracked/damaged
P2723	A/Trans Case (51)	1-2-3-4 clutch fluid passage seal (65) damaged/leaking
P2723	A/Trans Fluid Pump (203) Torque Converter Assembly (27)	Fluid pump housing vanes/rotor/slide damaged/scored A/Trans pump fluid outlet seal assembly (57) damaged/leaking Fluid pump or torque converter overstressed due to high temperatures
P2723	A/Trans Fluid Filter Assembly (201)	Oil filter (201) or filter seal (202) loose or damaged
P2723	Reaction Sun Gear Assembly (466)	Reaction sun gear broke away from shell Input sun gear missing or broken

DTC P2723 or P2724

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Control Valve Lower Body and Upper Body Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle)
«Low and Reverse Clutch and 1-2-3-4 Clutch Plate Removal»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-off-vehicle)
«Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Clutch PC Solenoid 5 Control	P2729	P2730	P2730	P2728

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 5 Control				Fault or Malfunction

Pressure Control Solenoid Valve 5 Performance Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 5 Control	Fault or Malfunction

Pressure Control Solenoid Valve 5 Control Circuit Low Voltage Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 5 Control		Fault or Malfunction	Fault or Malfunction

Pressure Control Solenoid Valve 5 Control Circuit High Voltage Test Status

The clutch pressure control (PC) solenoid 5 is part of the control solenoid valve assembly which has no serviceable components. The normally low PC 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 PC solenoid 5 pressure increases pressure to the 1-2-3-4 clutch. The transmission control module (TCM) varies the current to the PC solenoid 5 through a low side driver. Increasing the current to PC solenoid 5 increases oil pressure by closing OFF the solenoid exhaust port. Decreasing the current to PC solenoid 5 decreases oil pressure by opening the exhaust port. PC solenoid 5 power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuit and components from excessive current flow. If excessive current flow is detected, the HSD will turn OFF. When the fault is corrected, the HSD will reset.

P2728

DTC P2728 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.

P2729

DTC P2729 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.

P2730

DTC P2730 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.

P2728

TCM detects an internal electrical performance malfunction of the clutch PC solenoid 5 control circuit where the measured clutch PC solenoid 5 current does not equal the commanded clutch PC solenoid 5 current for 5 seconds.

P2729

TCM detects a short to ground on the clutch PC solenoid 5 control circuit for 1 second.

P2730

TCM detects an open or short to voltage on the clutch PC solenoid 5 control circuit for 1 second.

P2728

DTC P2728 is a Type C DTC.
TCM freezes transmission adaptive functions on the 1-2-3-4 clutch.

P2729

DTC P2729 is a Type A DTC.
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM inhibits neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM limits the transmission to Reverse, 1st and 3rd gear operation.

P2730

DTC P2730 is a Type A DTC.
TCM inhibits the TCC.
TCM forces the HSD OFF.
TCM commands maximum line pressure.
TCM freezes transmission adaptive functions.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM inhibits neutral idle.
TCM limits the transmission to Reverse and 5th gear operation.

DTC P2728 is a Type C DTC.
DTCs P2729 and P2730 are Type A DTCs.

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#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-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Operate the vehicle in second gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature, then operate the vehicle in Park for 5 seconds.
Operate the vehicle in Drive range. Allow the transmission to shift through all forward gear ranges. Verify with a scan tool the following test status parameters display OK: PC Sol. 5 Perf. Test Status PC Sol. 5 Ckt. High Voltage Test Status PC Sol. 5 Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Refer to Circuit/System Testing below. If all test status parameters display OK
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 you observe 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»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to «Control Solenoid Valve and Transmission Control Module Assembly Replacement»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-repair-instructions-on-vehicle) .
Perform the «Control Solenoid Valve and Transmission Control Module Assembly Inspection»(/buick/enclave/i-2007-2013/remont/automatic-trans/#automatic-transmission-6t75-diagnostic-information-and-procedures) . The Q8 control solenoid valve assembly must be externally cleaned of all debris.
Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
Ignition ON, verify with a scan tool the following test status parameters display OK: PC Sol. 5 Perf. Test Status PC Sol. 5 Ckt. High Voltage Test Status PC Sol. 5 Ckt. Low Voltage Test Status If any test status parameter displays Fault or Malfunction Replace the Q8 control solenoid valve assembly. If all test status parameters display OK
All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
TCC Pressure Control Solenoid	P2764	P2763	P2763	P2762

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
TCC Pressure Control Solenoid Valve Control				Fault or Malfunction

TCC Pressure Control Solenoid Valve Control Circuit Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
TCC Pressure Control Solenoid Valve Control	Fault or Malfunction

TCC Pressure Control Solenoid Valve Control Circuit Low Voltage Test Status

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Operating Conditions: Ignition ON Parameter Normal Range: OK
TCC Pressure Control Solenoid Valve Control		Fault or Malfunction	Fault or Malfunction

TCC Pressure Control Solenoid Valve Control Circuit High Voltage Test Status

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

P2762

DTC P2762 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.

P2763

DTC P0658, P0659, or P2763 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
High side driver is enabled.

P2764

DTC P0658, P0659, or P2764 is not set.
Engine speed is 400 RPM or greater for 5 seconds.
Ignition voltage is 8.6 volts or greater.
High side driver is enabled.

P2762

TCM detects an internal electrical performance malfunction of the TCC PC solenoid control circuit where the measured TCC PC solenoid current does not equal the commanded TCC PC solenoid for 5 seconds.

P2763

TCM detects an open/high resistance or short to voltage on the TCC pressure solenoid control circuit for 5 seconds.

P2764

TCM detects a short to ground on the TCC pressure solenoid control circuit for 5 seconds.

P2762

DTC P2762 is a Type C DTC.

P2763

DTC P2763 is a Type A DTC.
TCM inhibits 6th gear.
TCM forces TCC OFF.
TCM commands the hot mode shift pattern.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears

P2764

DTC P2764 is a Type A DTC.
TCM inhibits TCC.
TCM freezes transmission adaptive functions.
TCM commands maximum line pressure.
TCM inhibits neutral idle.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.
TCM limits the transmission to Reverse and 3rd or 5th gear operation.
TCM commands the HSD OFF.

DTC P2762 is a Type C DTC.
DTCs P2763 and P2764 are Type A DTCs.

Connector End View Reference

«COMPONENT CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
«INLINE HARNESS CONNECTOR END VIEWS - INDEX»(/buick/enclave/i-2007-2013/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-index)

Description and Operation