6T70/6T75 - Automatic Transmission

DTC P06AC-P06AE

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptors
DTC P06AC
- Transmission Control Module (TCM) Power Up Temperature Sensor Performance

DTC P06AD
- Transmission Control Module (TCM) Power Up Temperature Sensor Circuit Low Voltage

DTC P06AE
- Transmission Control Module (TCM) Power Up Temperature Sensor Circuit High Voltage

Circuit/System Description

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.

Conditions for Running the DTC

P06AC
* No DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0401, P042E, P0658, P0668, P0669, P06AC, P06AD, P06AE, P0712, P0713, P0716, P0717, P0722, P0723, P0962, P0963, P0966, P0967, P0970, P0971, P215C, P2720, P2721, P2729, or P2730.
* The engine speed is 400 RPM or greater for 5 seconds.
* The ignition voltage is 8.6 volts or greater.
* Brake torque is not active.
* The torque signal is valid.
* The throttle position signal is valid.

P06AD
* No DTCs P06AD, P0716, P0717, P0722, or P0723.
* The engine speed is 400 RPM or greater for 5 seconds.
* The ignition voltage is 8.6 volts or greater.

P06AE
* The engine speed is 400 RPM or greater for 5 seconds.
* The ignition voltage is 8.6 volts or greater.
* DTC P06AE has not set this ignition cycle.

Conditions for Setting the DTC

P06AC
* The 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.
* The 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.
* The above conditions have to be met for 5 minutes within a 6 minute period.

P06AD

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

P06AE

The TCM power up temperature is 165°C (329°F) or greater for 1 minute.

Action Taken When the DTC Sets

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

Conditions for Clearing the DTC

DTC P06AC, P06AD, P06AE are Type B DTCs.

Reference Information
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

* Transmission General Description (Transmission General Description)
* Electronic Component Description (Electronic Component Description) for control solenoid valve assembly

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Engine idling at normal operating temperature, verify the scan tool TCM Power up Temperature parameter is between -59 and +165°C (-74 and +329°F).
2. Operate the vehicle at 64 km/h (40 mph) for 10 minutes. Monitor the TCM Temperature, TCM Power up Temperature, and the Trans. Fluid Temp. parameters with a scan tool. The TCM Temperature and the Trans. Fluid Temp. parameters should be within 20°C (36°F) of each other, and the TCM Temperature and TCM Power up Temperature parameters should be within 10°C (18°F) of each other.

• If the TCM Temperature and TCM Power up Temperature parameters are not within 10°C (18°F), or the TCM Power up Temperature and Trans. Fluid Temp. parameters are not within 20°C (36°F), replace the control solenoid valve assembly.

3. 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.

Repair Instructions

Note:
* Perform the Service Fast Learn Adapts (6T70/6T75 - Automatic Transmission) following all transmission related repairs
* Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (Control Solenoid Valve and Transmission Control Module Assembly Inspection).

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning) for control solenoid valve assembly replacement, setup, and programming