Automatic Transmission - 2MT70

DTC P0667, P0668, or P0669

Diagnostic Instructions

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

DTC Descriptors
DTC P0667
- Transmission Control Module (TCM) Temperature Sensor Performance

DTC P0668
- Transmission Control Module (TCM) Temperature Sensor Circuit Low Voltage

DTC P0669
- Transmission Control Module (TCM) Temperature Sensor Circuit High Voltage

Circuit/System Description

The transmission control module (TCM) temperature sensor is located inside of the TCM. The TCM is located within the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The TCM temperature sensor provides the TCM temperature. This temperature reading is used in various shifting and diagnostic routines in the TCM software.

Conditions for Running the DTC

P0667
* No DTCs P0711, P0712, P0713, P077B, or P215C.
* No DTCs P0721, P0722, or P0723.
* DTC P0667 has not passed this key ON.
* Ignition voltage is 11-18V.
* The engine running for 5 seconds.
* The TCM temperature is between -50 and +149°C (-58 and +300°F).
* Vehicle speed is greater than 8 km/h (5 mph) for 300 seconds cumulative.

P0668
* DTC P0668 has not failed this ignition cycle.
* Ignition voltage is 11-18V.
* The engine running for 5 seconds.

P0669
* DTC P0669 has not failed this ignition cycle.
* Ignition voltage is 11-18V.
* The engine running for 5 seconds.
* The transmission output shaft speed is greater than 200 RPM for greater than 5 seconds.

Conditions for Setting the DTC

P0667 - Fail Case 1
* Vehicle speed is greater than 8 km/h (5 mph) for 200 seconds cumulative.
* The TCM temperature is between -50 and +21°C (-58 and +70°F).
* The TCM temperature has changed by less than 2.0°C (3.6°F) in 100 seconds.
* The transmission fluid temperature (TFT) is greater than 70°C (158°F).
* The TFT has increased by 55°C (99°F) since startup.

P0667 - Fail Case 2
* Vehicle speed is greater than 8 km/h (5 mph) for 200 seconds cumulative.
* The TCM temperature is between 120-150°C (248-302°F).
* The TCM temperature has changed by less than 2.0°C (3.6°F) in 100 seconds.
* The transmission fluid temperature (TFT) is greater than 70°C (158°F).
* The TFT has increased by 55°C (99°F) since startup.

P0667 - Fail Case 3

The TCM temperature changes by greater than or equal to 20°C (36°F) 14 times over 7 seconds.

P0668

The TCM temperature is greater than or equal to 161°C (321°F) for greater than 10 seconds.

P0669

The TCM temperature is less than or equal to -61°C (-77°F) for greater than 10 seconds.

Action Taken When the DTC Sets

DTCs P0667, P0668, and P0669 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0667, P0668, and P0669 are Type B DTCs.

Diagnostic Aids

Reprogram the TCM with the latest software version and retest the DTC. Perform the control solenoid (w/body and TCM) valve assembly inspection procedure before replacing the control solenoid (w/body and TCM) valve assembly.

Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

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

Circuit/System Verification

P0667

Start the engine and operate the vehicle at 64 km/h (40 mph) while observing the Trans. Fluid Temp. and the TCM Temperature Sensor parameters.

The system is operating normally if the TFT temperature is within 10°C (18°F) of the TCM temperature sensor.

P0668 and P0669

Start the engine and check for DTCs P0668 and P0669.

Circuit/System Testing

1. Clear the DTC and operate the vehicle under the condition for running and setting the DTC.
2. Verify that the DTC does not reset.

• If the DTC resets, replace the control solenoid (w/body and TCM) valve assembly.

Component Testing

Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (Control Solenoid Valve and Transmission Control Module Assembly Inspection).

Repair Instructions

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

Control Module References (Programming and Relearning) for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.