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
- Control Module Power Up Temperature Sensor Performance

DTC P06AD
- Control Module Power Up Temperature Sensor Circuit Low Voltage

DTC P06AE
- Control Module 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
* 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.
* 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 engine torque signal is valid.
* The throttle position signal is valid.

P06AD
* DTC P06AD, P0716, P0717, P0722, or P0723 is not set.
* 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 is not set.

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 lower for 1 minute.

P06AE

The TCM power up temperature is 164°C (327°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. Operate the vehicle at 64 km/h (40 mph) for 10 minutes.

• If the DTC resets, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement (6T70/6T75 - Automatic Transmission).

2. 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 Transmission Adaptive Values Learn (6T30/6T40/6T45/6T50 - 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