Diagnostic Instructions
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 control solenoid (w/body and TCM) valve assembly and is not serviced separately. The TCM temperature sensor provides the temperature of the TCM. 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
• | The engine speed is greater than 500 RPM for 5 seconds or more. |
• | The ignition voltage is between 8.6 volts and 19.0 volts. |
P0667
• | No TFT DTCs P0711, P0712, or P0713. |
• | No ISS DTCs P0716 or P0717. |
• | No OSS DTCs P0722 or P0723. |
• | DTC P0667 has not passed this key ON. |
• | The TCM temperature is between -54 and +149°C (-65 and +300°F). |
P0668
DTC P0668 has not failed this ignition cycle.
P0669
• | No ISS DTCs P0716 or P0717. |
• | No OSS DTCs P0722 or P0723. |
• | The transmission output shaft speed is 200 RPM or greater for 200 seconds or more. |
• | The TCC slip speed is 120 RPM or greater for 200 seconds or more. |
• | DTC P0669 has not failed this ignition cycle. |
Conditions for Setting the DTC
P0667 - Fail Case 1
• | Vehicle speed is 8 km/h (5 mph) or greater for 300 seconds cumulative. |
• | Torque converter clutch (TCC) slip speed is greater than 120 RPM for 300 seconds cumulative. |
• | The TCM temperature is between -55 and +21°C (-67 and +70°F). |
• | The transmission fluid temperature (TFT) is 70°C (158°F) or greater. |
• | The TCM temperature has changed by less than 2.0°C (3.6°F) in 100 seconds. |
• | The TFT has increased by 55°C (99°F) since startup. |
P0667 - Fail Case 2
• | Vehicle speed is 8 km/h (5 mph) or greater for 300 seconds cumulative. |
• | TCC slip speed is greater than 120 RPM for 300 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 TFT is 70°C (158°F) or greater. |
• | The TFT has increased by 55°C (99°F) since startup. |
P0667 - Fail Case 3
The TCM temperature changes by 20°C (36°F) or greater 14 times over 7 seconds.
P0668
The TCM temperature is 249°C (480°F) or greater for 4 seconds or more.
P0669
The TCM temperature is -249°C (-416°F) or greater for 10 seconds or more.
Action Taken When the DTC Sets
• | DTCs P0667, P0668, and P0669 are Type C DTCs. |
• | The TCM allows the vehicle to operate in transmission protection mode. |
Conditions for Clearing the DTC
DTCs P0667, P0668, and P0669 are Type C DTCs.
Diagnostic Aids
Reprogram the TCM and retest the DTC to see if the DTC resets. Perform the
Control Solenoid Valve and Transmission Control Module Assembly Inspection
before replacing the control solenoid (w/body and TCM) valve
assembly.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
DTC Type Reference
Electrical Information Reference
Circuit/System Verification
P0667
- Start the engine and operate the vehicle at 64 km/h (40 mph) while observing the TCM power up temperature sensor and the TCM temperature sensor.
- The system is operating normally if the TCM power up 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
- 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 solenoid (w/body and TCM) valve assembly replacement. Refer to
Control Module References
for replacement, setup, and programming. |