6T30/6T40/6T45 - Automatic Transmission
DTC P06AC, P06AD, or 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
Diagnostic Fault Information
Circuit/System Description
The transmission control module (TCM) power up temperature sensor is located inside of the control solenoid (w/body and TCM) valve assembly which has no serviceable parts. 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 in the TCM software. This fault is handled inside the TCM and no external circuits are involved.
Conditions for Running the DTC
P06AC
* No ISS DTCs P0716 or P0717.
* No OSS DTCs P0722 or P0723.
* The engine speed is 500 RPM or greater for 5 seconds.
* The ignition voltage is between 9.0 volts and 18.0 volts.
* DTC P06AC has not set this ignition cycle.
* The TCM power up temperature is between -40 and +150°C (-40 and +302°F).
P06AD
* No ISS DTCs P0716 or P0717.
* No OSS DTCs P0722 or P0723.
* The engine speed is 500 RPM or greater for 5 seconds.
* The ignition voltage is between 9.0 volts and 18.0 volts.
* DTC P06AD has not set this ignition cycle.
* The transmission output shaft speed is 200 RPM or greater for 4 minutes.
* The torque converter clutch (TCC) slip speed is 120 RPM or greater for 4 minutes.
P06AE
* The engine speed is 500 RPM or greater for 5 seconds.
* The ignition voltage is between 9.0 volts and 18.0 volts.
* DTC P06AE has not set this ignition cycle.
Conditions for Setting the DTC
P06AC - Condition 1
* Vehicle speed is 8 km/h (5 mph) or greater for 5 minutes cumulative.
* TCC slip speed is greater than 150 RPM for 5 minutes cumulative.
* The TCM power up temperature is between -40 and +150°C (-40 and +302°F).
* The TCM power up temperature has changed by less than 2°C (3.6°F) in 5 minutes.
* The transmission fluid temperature (TFT) is 70°C (158°F) or greater.
* The TFT has increased by 55°C (99°F) since startup.
Condition 2
* Vehicle speed is 8 km/h (5 mph) or greater for 5 minutes cumulative.
* The TCM power up temperature is between 120-150°C (248-302°F).
* The TCM power up temperature at startup has changed by less than 2°C (3.6°F) in 5 minutes.
* The TFT is 70°C (158°F) or greater.
* The TFT has increased by 55°C (99°F) since startup.
Condition 3
The TCM power up temperature changes by 20°C (36°F) or greater 5 times over 7 seconds.
P06AD
The TCM power up temperature is -254°C (-425°F) or less for 13 seconds.
P06AE
The TCM power up temperature is 254°C (489°F) or more for 13 seconds.
Action Taken When the DTC Sets
DTCs P06AC, P06AD, and P06AE are Type C DTCs.
Conditions for Clearing the DTC
DTCs P06AC, P06AD, and P06AE are Type C DTCs.
Diagnostic Aids
During a road test, the TCM Power-Up temperature should steadily increase to a normal operating temperature, and then stabilize.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics 6T30/6T40/6T45 - Automatic Transmission
Connector End View Reference
* Component Connector End Views Connector End Views By Name
* Inline Harness Connector End Views Connector End Views By Number
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Description and Operation
* Transmission General Description Transmission General Description
* Transmission Component and System Description Transmission Component and System Description
* Electronic Component Description Electronic Component Description
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 running. Verify the scan tool TCM Power Up Temperature parameter is between -254 and +254°C (-425 and +489°F).
• If not within the specified range, replace the control solenoid (w/body and TCM) valve assembly.
2. Operate the vehicle at 64 km/h (40 mph) for 10 minutes. Monitor the TCM Power-Up Temperature parameter and the TCM Temperature parameter with a scan tool. The TCM Power-Up Temperature parameter and the TCM Temperature parameter should be within 10°C (18°F) of each other.
• If the TCM Power-Up Temperature parameter is not within the specified value of the TCM Temperature parameter, then replace the control solenoid (w/body and TCM) 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
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Note: Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
* Refer to Control Module References Programming and Relearning for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.
* Perform the Service Fast Learn Adapts 6T30/6T40/6T45 - Automatic Transmission following all transmission related repairs.