6L45/6L50/6L80/6L90 - Automatic Transmission

DTC P0711, P0712, or P0713

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 P0711
- Transmission Fluid Temperature (TFT) Sensor Performance

DTC P0712
- Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage

DTC P0713
- Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage

Circuit/System Description

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

Conditions for Running the DTC

P0711
* No other ECM or TCM DTCs are set.
* Ignition voltage is 8.6 volts or greater.
* The engine speed is 400 RPM or greater for 5 seconds.
* The vehicle speed is 8 km/h (5 mph) or greater for 5 minutes.
* The accelerator pedal position signal is valid.
* The engine torque signal is valid.

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

Conditions for Setting the DTC

P0711

The difference between the transmission fluid temperature (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.

P0712

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

P0713

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

Action Taken When the DTC Sets

* DTCs P0711, P0712, and P0713 are Type B DTCs.
* The TCM freezes transmission adaptive functions.
* The TCM allows the vehicle to operate in transmission protection mode.
* The TCM defaults the TFT to the TCM temperature with an offset.

Conditions for Clearing the DTC

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

Diagnostic Aids

During a road test, the transmission fluid temperature (TFT) should steadily increase to a normal operating temperature, and then stabilize.

Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (6L45/6L50/6L80/6L90 - 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

* Electronic Component Description (Electronic Component Description)
* Transmission General Description (Transmission General Description)
* Transmission Component and System Description (Transmission Component and System Description)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)

Circuit/System Verification

1. Engine idling at normal operating temperature, verify the scan tool Trans Fluid Temp. parameter is between -74 and +174°C (-101 and +345°F).

• If not within the specified range, replace the Q8 control solenoid valve assembly.

2. Operate the vehicle at 64 km/h (40 mph) for 10 minutes. Monitor the Transmission Fluid Temperature parameter and the TCM Temperature parameter with a scan tool. The Transmission Fluid Temperature parameter should increase by more than 2°C (3.5°F). Also, the Transmission Fluid Temperature parameter and the TCM Temperature parameter should be within 10°C (18°F) of each other.

• If the Transmission Fluid Temperature parameter does not increase by more than 2°C (3.5°F) or the Transmission Fluid Temperature parameter is not within 10°C (18°F) of the TCM Temperature parameter, then replace the Q8 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

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

* Control solenoid valve assembly replacement. Refer to Control Module References (Control Module References) for replacement, setup, and programming.
* Perform the Service Fast Learn Adapts (6L45/6L50/6L80/6L90 - Automatic Transmission) following all transmission related repairs.