Diagnostic Instructions
DTC Descriptor
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
| • | Ignition voltage is 11-18 volts. |
| • | The engine speed is greater than 450 RPM. |
| • | No DTCs P0722 or P0723. |
P0667
| • | No DTCs P0711, P0712, P077B, or P215C. |
| • | DTC P0667 has not passed this key ON. |
| • | The TCM temperature is between -39 and +149°C (-38 and +300°F). |
P0668
DTC P0668 has not failed this ignition cycle.
P0669
| • | The transmission output shaft speed is greater than 200 RPM for greater than 200 seconds. |
| • | DTC P0669 has not failed this ignition cycle. |
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
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
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. |
DTCs P0668 and P0669
Start the engine and check for DTCs P0668 and P0669.
Circuit/System Testing
- Clear the DTC and operate the vehicle under the condition for running and setting the DTC.
- 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.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.
