GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Acadia - 2WD 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 DTC P0667, P0668, or P0669

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions 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 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

    •  Automatic Transmission Inline 20-Way Connector End View
    •  Automatic Transmission Internal Connector End Views
    •  Automatic Transmission Related Connector End Views

DTC Type Reference

    •  Diagnostic Trouble Code (DTC) Type Definitions
    •  Diagnostic Trouble Code (DTC) List/Type

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Circuit/System Verification

P0667

  1. 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.
  2. 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
  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.
    3. ⇒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.
    • Perform the Service Fast Learn Adapts .