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Automatic Transmission - af40-6 - DTC p2716 to DTC p2764 Cadillac SRX II

Automatic Trans ~2890 words

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
SignalP2720P2721P2721P2716, P2719
Low ReferenceP2716, P2719, P2721P2716, P2719, P2721P2716, P2719, P2721

Typical Scan Tool Data

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 0.1-1.1 A
Signal0 A2.55 A2.55 A
Low Reference2.55 A1
1. Internal TCM damage may occur if shorted to B+

Clutch Pressure Control Solenoid Valve

Circuit/System Description

The shift control solenoid (SLC3) is installed on the front valve body. The solenoid linearly control hydraulic pressure in response to signals output from the transmission control module (TCM). Through this, the SLC3 controls operating hydraulic pressure to the clutch 3 for smooth shifting. According to each shift control solenoid assembly, the transmission shifts from 1st gear into 6th gear and vice versa. As a fail-safe function, if any shift control solenoid assembly abnormality occurs, the TCM will disable the current to the solenoids.

  1. The ignition voltage is between 10.2-15.5 V.
  2. The engine speed is greater than 400 RPM for 2 s.
  3. The transmission is not in emergency mode.
  4. Driving in D range.
  5. TCM communication is normal.
  6. DTCs P2720 and P2721 are not set.

P2719

  1. The ignition voltage is between 10.2-15.5 V.
  2. The engine speed is greater than 400 RPM for 2 s.
  3. The transmission is not in emergency mode.
  4. Driving in D range.
  5. TCM communication is normal.
  6. The Automatic Transmission Fluid Temperature is more than 20°C (68°F).
  7. SLC3 current is more than 0.85 A.
  8. SLC3 current is not changed.

P2720

  1. The ignition voltage is between 10.2-15.5 V.
  2. The engine speed is greater than 400 RPM for 2 s.
  3. The transmission is not in emergency mode.
  4. Driving in D range.
  5. TCM communication is normal.
  6. DTC P2721 is not set.

P2721

  1. The ignition voltage is between 10.2-15.5 V.
  2. The engine speed is greater than 400 RPM for 2 s.
  3. The transmission is not in emergency mode.
  4. Driving in D range.
  5. TCM communication is normal.
  6. DTC P2720 is not set.

Deviation between commanded current and feedback current

The TCM detects the error current more than 80 mA for 2.75 ms.

The TCM detects at least 5 times less than 23 mA current consumption of the SLC3 control circuit for 100 ms.

The TCM detects at least 5 times more than 1.333 A current consumption of the SLC3 control circuit for 100 ms.

P2716, P2719

  1. DTCs P2716 and P2719 are Type B DTCs.
  2. The TCM turns OFF all solenoids.
  3. The TCM allows the vehicle to operate only in the second gear and "R" range after a stop.

P2720, P2721

  1. DTCs P2720 and P2721 are Type B DTCs.
  2. No self learning function
  3. The TCM turns OFF all solenoids.
  4. The TCM allows the vehicle after a stop to operate only in the second gear and "R" range.
  1. DTCs P2716 and P2719 are Type B DTCs.
  2. The TCM detects the error current less than 50 mA for 2.75 ms.
  1. DTCs P2720 and P2721 are Type B DTCs.
  2. The current consumption of the SLC3 control circuit is 0.1-1.1 A for 500 ms.

Diagnostic Aids

When attempting to set solenoid electrical DTCs, ensure the TCM is warmed up and the transmission is operated in 2nd gear long enough to ensure a 3°C (5°F) increase in TCM substrate temperature. This will place the TCM under the optimal conditions to test solenoid electrical DTCs.

Reference Information

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Description and Operation

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
  2. Operate the vehicle in 2nd gear long enough to ensure at least a 3°C (5°F) rise in transmission fluid temperature, then operate the vehicle in Park for 5 s.
  3. Observe the scan tool Clutch Pressure Control Solenoid Valve 3 Current parameter. The reading should be between 0.1-1.1 A.

Circuit/System Testing

Command the Clutch Pressure Control Solenoid Valve 3 with a scan tool. The value should change from 0.0-1.0 A.

  1. If the value does not change, turn ignition OFF, remove the K71 Transmission Control Module. Connect a test lamp between the low reference circuit terminal 22 X2 at the K71 Transmission Control Module and the voltage supply component circuit terminal 14 X2 at the K71 Transmission Control Module. Command the Clutch Pressure Control Solenoid Valve 3 with a scan tool. The test lamp has to illuminate brighter with increasing current.
  2. If the test lamp always illuminate or always does not illuminate, replace the K71 Transmission Control Module.

Static Test

  1. Ignition OFF, remove the K71 Transmission Control Module.
  2. Test for 5-5.6 ohms at 20°C (68°F) between the low reference circuit terminal 22 X2 and the voltage supply circuit terminal 14 X2. If less than the specified range, test the wiring harness for internal short. If the circuit test normal, replace the Q27C Pressure Control Solenoid Valve 3.
  3. Test for infinite resistance between each terminal and the low reference circuit terminal 22 X2 and also to the voltage supply circuit terminal 14 X2. If less than the specified range, replace the wiring harness.
  4. If all circuit test normal, perform the control solenoid valve inspection. Refer to «Control Solenoid Valve Inspection (M36 and MXE)»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-af40-6-symptom-troubleshooting-and-diagnosis) . If the inspection test normal, replace the control valve body.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Control valve body replacement - Refer to «Control Valve Body Replacement»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-af40-6-repair-instructions-on-vehicle) .
  2. TCM - Refer to «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) .
  3. Perform the «Transmission Adaptive Functions»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-af40-6-description-and-operation) .
  4. Wiring harness - Refer to «Automatic Transmission Wiring Harness Replacement»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-af40-6-repair-instructions-on-vehicle) .
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
SignalP2729P2730P2730P2725, P2728
Low ReferenceP2725, P2728, P2730P2725, P2728, P2730P2725, P2728, P2730
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 0.1-1.1 A
Signal0 A2.55 A2.55 A
Low Reference2.55 A1
1. Internal TCM damage may occur if shorted to B+

Pressure Control Solenoid Valve

The shift control solenoid (SLB1) is installed on the front valve body. The solenoid linearly controls hydraulic pressure in response to signals output from the transmission control module TCM. Through this, the SLB1 controls operating hydraulic pressure to the brake for smooth shifting. According to each shift control solenoid assembly, the transmission shifts from 1st gear into 6th gear and vice versa. As a fail-safe function, if any shift control solenoid assembly abnormality occurs, the TCM will disable the current to the solenoids.

P2725

  1. The ignition voltage is 10.2-15.5 V.
  2. The engine speed is greater than 400 RPM for 2 s.
  3. The transmission is not in emergency mode.
  4. Driving in D range.
  5. TCM communication is normal.
  6. DTCs P2729 and P2730 are not set.

P2728

  1. The ignition voltage is 10.2-15.5 V.
  2. The engine speed is greater than 400 RPM for 2 s.
  3. The transmission is not in emergency mode.
  4. Driving in D range.
  5. TCM communication is normal.
  6. The automatic transmission fluid temperature is more than 20°C (68°F).
  7. SLB1 current is more than 0.85 A.
  8. SLB1 current is not changed.

P2729

  1. The ignition voltage is 10.2-15.5 V.
  2. The engine speed is greater than 400 RPM for 2 s.
  3. The transmission is not in emergency mode.
  4. Driving in D range.
  5. TCM communication is normal.
  6. DTC P2730 is not set.

P2730

  1. The ignition voltage is 10.2-15.5 V.
  2. The engine speed is greater than 400 RPM for 2 s.
  3. The transmission is not in emergency mode.
  4. Driving in D range.
  5. TCM communication is normal.
  6. DTC P2729 is not set.

Deviation between commanded current and feedback current.

The TCM detects the error current more than 80 mA for 2.75 ms.

The TCM detects at least 5 times less than 23 mA current consumption of the SLB1 control circuit for 100 ms.

The TCM detects at least 5 times more than 1.333 A current consumption of the SLB1 control circuit for 100 ms.

P2725, P2728

  1. DTC P2725 and P2728 are Type B DTC.
  2. The TCM turns OFF all solenoids.
  3. The TCM allows the vehicle to operate only in the second gear and "R" range after a stop.

P2729, P2730

  1. DTCs P2729 and P2730 are Type B DTCs.
  2. No self learning function.
  3. The TCM turns OFF all solenoids.
  4. The TCM allows the vehicle to operate only in the second gear and "R" range after a stop.
  1. DTC P2725 and P2728 are Type B DTC.
  2. The TCM detects the error current less than 50 mA for 2.75 ms.
  1. DTCs P2729 and P2730 are Type B DTCs.
  2. The current consumption of the SLB1 control circuit is 0.1-1.1 A for 500 ms.

When attempting to set solenoid electrical DTCs, ensure the TCM is warmed up and the transmission is operated in 2nd gear long enough to ensure a 3°C (5°F) increase in TCM substrate temperature. This will place the TCM in the optimal condition to test solenoid electrical DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Description and Operation

DTC Type Reference

Scan Tool Reference

  1. Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
  2. Operate the vehicle in 2nd gear long enough to ensure at least a 3°C (5°F) rise in transmission fluid temperature, then operate the vehicle in Park for 5 s.
  3. Observe the scan tool Brake Band Pressure Control Solenoid Valve Current parameter. The reading should be between 0.1-1.1 A.

Command the Shift Brake Pressure Control Solenoid Valve with a scan tool. The value should change from 0.0-1.0 A.

  1. If the value does not change, turn ignition OFF, remove the K71 Transmission Control Module. Connect a test lamp between the low reference circuit terminal 16 X2 at the K71 Transmission Control Module and the voltage supply component circuit terminal 21 X2 at the K71 Transmission Control Module. Command the Shift Brake Pressure Control Solenoid Valve with a scan tool. The test lamp has to illuminate brighter with increasing current.
  2. If the test lamp always illuminates or always does not illuminate, replace the K71 Transmission Control Module.
  1. Ignition OFF, remove the K71 Transmission Control Module.
  2. Test for 5-5.6 ohms at 20°C (68°F) between the low reference circuit terminal 16 X2 and the voltage supply circuit terminal 21 X2. If less than the specified range, test the wiring harness for internal short. If the circuit test normal, replace the Q27E Pressure Control Solenoid Valve 5.
  3. Test for infinite resistance between each terminal and the low reference circuit terminal 16 X2 and also to the voltage supply circuit terminal 21 X2. If less than the specified range, replace the wiring harness.
  4. If all circuit test normal, perform the «Control Solenoid Valve Inspection (M36 and MXE)»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-af40-6-symptom-troubleshooting-and-diagnosis) . If the inspection tests normal, replace the control valve body.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Control valve body replacement - Refer to «Control Valve Body Replacement»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-af40-6-repair-instructions-on-vehicle) .
  2. TCM - Refer to «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) .
  3. Wiring harness - Refer to «Automatic Transmission Wiring Harness Replacement»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-af40-6-repair-instructions-on-vehicle) .
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
SignalP2763P2764P2764P2759, P2762
Low ReferenceP2759, P2762, P2764P2759, P2762, P2764P2759, P2762, P2764
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: 0.1-1.1 A
Signal0 A2.55 A2.55 A
Low Reference2.55 A1
1. Internal TCM damage may occur if shorted to B+

TCC Pressure Control Solenoid Valve Current

Based on input speed and output speed signals, signals from the engine control module (engine speed and throttle opening) and vehicle speed, smooth lock-up control and slip is performed through the lock-up control solenoid (SLU). The SLU is linearly turned ON and OFF. The lock-up clutch inside the torque converter is operated, and the pump impeller and turbine runner are connected. Through this, the engine and the automatic transmission are coupled and engine output is connected directly to the automatic transmission, eliminating transmission loss. By sliding the lock-up clutch when lock-up is in the OFF range, extends the lock-up range to low vehicle speeds. It also suppresses a rise in engine speed and increases transmission efficiency, improving fuel economy and at the same time, through the sliding of the lockup clutch, engine vibration can be absorbed by the torque converter.

P2759

  1. The ignition voltage is 10.2-15.5 V.
  2. The engine speed is greater than 400 RPM for 2 s.
  3. The transmission is not in emergency mode.
  4. Driving in D range.
  5. Transmission Control Module (TCM) communication is normal.
  6. DTCs P2763 and P2764 are not set.

P2762

  1. The ignition voltage is 10.2-15.5 V.
  2. The engine speed is greater than 400 RPM for 2 s.
  3. The transmission is not in emergency mode.
  4. Driving in D range.
  5. TCM communication is normal.
  6. The Automatic Transmission Fluid Temperature is more than 20°C (68°F).
  7. SLU current is more than 0.85 A.
  8. SLU current is not changed.

P2763

  1. The ignition voltage is 10.2-15.5 V.
  2. The engine speed is greater than 400 RPM for 2 s.
  3. The transmission is not in emergency mode.
  4. Driving in D range.
  5. TCM communication is normal.
  6. DTC P2764 is not set.
  1. The ignition voltage is 10.2-15.5 V.
  2. The engine speed is greater than 400 RPM for 2 s.
  3. The transmission is not in emergency mode.
  4. Driving in D range.
  5. TCM communication is normal.
  6. DTC P2763 is not set.

Deviation between commanded current and feedback current

The TCM detects the error current more than 80 mA for 2.75 ms.

The TCM detects at least 5 times less than 23 mA current consumption of the SLU control circuit for 100 ms.

The TCM detects at least 5 times more than 1.333 A current consumption of the SLU control circuit for 100 ms.

P2759, P2762

  1. DTCs P2759 and P2762 are Type B DTCs.
  2. The TCM turns OFF all solenoids.
  3. The TCM allows the vehicle to operate only in second gear and "R" range after a stop.

P2763, P2764

  1. DTCs P2763 and P2764 are Type B DTCs.
  2. No self learning function.
  3. The TCM turns OFF all solenoids.
  4. The TCM allows the vehicle to operate only in second gear and "R" range after a stop.
  1. DTCs P2759 and P2762 are Type B DTCs.
  2. The TCM detects the error current less than 50 mA for 2.75 ms.
  1. DTCs P2763 and P2764 are Type B DTCs.
  2. The current consumption of the SLU control circuit is 0.1-1.1 A for 500 ms.

When attempting to set solenoid electrical DTCs, ensure the TCM is warmed up and the transmission is operated in 2nd gear long enough to ensure a 3°C (5°F) increase in TCM substrate temperature. This will place the TCM in the optimal condition to test solenoid electrical DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Description and Operation

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
  2. Operate the vehicle in 2nd gear long enough to ensure at least a 3°C (5°F) rise in transmission fluid temperature, then operate the vehicle in Park for 5 s.
  3. Observe the scan tool data TCC Pressure Control Solenoid Valve Current parameter. The reading should be between 0.1-1.1 A.

Command the TCC Solenoid Valve increase and decrease with a scan tool. The value should rise from 0.1-1.1 A and return to 0.1 A.

  1. If the value does not change, turn ignition OFF, remove the K71 Transmission Control Module. Connect a test lamp between the low reference circuit terminal 4 X2 at the K71 Transmission Control Module and the voltage supply component circuit terminal 9 X2 at the K71 Transmission Control Module. Command the TCC Solenoid Valve increase and decrease with a scan tool. The test lamp has to illuminate brighter with increasing current.
  2. If the test lamp always illuminates or always does not illuminate, replace the K71 Transmission Control Module.
  1. Ignition OFF, remove the K71 Transmission Control Module.
  2. Test for 5-5.6 ohms at 20°C (68°F) between the low reference circuit terminal 4 X2 and the voltage supply circuit terminal 9 X2. If less than the specified range, test the wiring harness for internal short. If the circuit test normal, replace the Q27D Pressure Control Solenoid Valve 4.
  3. Test for infinite resistance between each terminal and the low reference circuit terminal 4 X2 and also to the voltage supply circuit terminal 9 X2. If less than the specified range, replace the wiring harness.
  4. If all circuit test normal, perform the control solenoid valve inspection. Refer to «Control Solenoid Valve Inspection (M36 and MXE)»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-af40-6-symptom-troubleshooting-and-diagnosis) . If the inspection test normal, replace the control valve body.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Control valve body replacement - Refer to «Control Valve Body Replacement»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-af40-6-repair-instructions-on-vehicle) for replacement, setup, and programming.
  2. TCM - Refer to «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for replacement, setup, and programming.
  3. Perform the «Transmission Adaptive Functions»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-af40-6-description-and-operation) .
  4. Wiring harness - Refer to «Automatic Transmission Wiring Harness Replacement»(/cadillac/srx/ii-2009-2012/remont/automatic-trans/#automatic-transmission-af40-6-repair-instructions-on-vehicle) for replacement.

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