DTC P0667, P0668, or P0669
Diagnostic InstructionsDTC Descriptor
DTC P0667

Control Module Temperature Sensor Performance

DTC P0668

Control Module Temperature Sensor Circuit Low Voltage

DTC P0669

Control Module Temperature Sensor Circuit High Voltage

Circuit/System Description

For an overview of the component/system, refer to:Electronic Component Description

Component

Description

K71 Transmission Control Module

The control module receives information from a variety of sensors, switches and serial data information from other control modules. This information is used to control a combination of solenoid valves to obtain the correct line pressure, gear ratio and torque converter clutch operation.

K71 is part of the component:Q8 Control Solenoid Valve Assembly

Control Module Temperature Sensor

The temperature sensor is a negative temperature coefficient thermistor, a resistor which changes based on temperature.

The component is part of the control module.

No external circuit diagnosis is involved.

Conditions for Running the DTCP0667
  • DTC P0101 – P0103, P0106 – P0108, P0171, P0172, P0174, P0175, P0201 – P0208, P0300 – P0308, P0401, P042E, P0658, P0668, P0669, P06AD, P06AE, P0712, P0713, P0716, P0717, P0722, P0723, P0962, P0963, P0966, P0967, P0970, P0971, P215C, P2720, P2721, P2729, P2730 = Not set
  • Accelerator pedal position signal = Valid
  • Engine Torque Signal=Valid
  • Engine Speed=400 to 7,500 RPM
  • Ignition Voltage=9 to 32 V

Frequency the DTC runs=Continuously—After the running conditions are met—For greater than 5 s

P0668, P0669
  • { P0669 }DTC P0716, P0717, P0722, P0723 = Not set
  • Engine Speed=400 to 7,500 RPM
  • Ignition Voltage=9 to 32 V

Frequency the DTC runs=Continuously—After the running conditions are met—For greater than 5 s

Conditions for Setting the DTCP0667
  • The difference between the following parameters is greater than a predefined value:
    • TCM Temperature
    • Transmission Fluid Temperature
  • The difference between the following parameters is greater than a predefined value:
    • TCM Power-Up Temperature
    • TCM Temperature

The above conditions have to be met continuously for 5 min within a 6 min period.

P0668

TCM Temperature=Warmer than 253°C (488°F)—For greater than 1 min

P0669

TCM Temperature=Colder than −253°C (−423°F)—For greater than 1 min

Actions Taken When the DTC Sets

DTCs listed in the DTC Descriptor category=Type B DTC—Additional actions taken:

TCM Temperature=The control module uses default replacement values.—TCM Power-Up Temperature

Conditions for Clearing the DTC

DTCs listed in the DTC Descriptor category=Type B DTC

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Master Electrical Component List

Electrical Information ReferenceDTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References

Circuit/System Verification
  1. Ignition » On / Vehicle » In Service Mode
  2. Verify the scan tool parameter:TCM Temperature=−39 to 139°C (−38 to 282°F)
    • If not between −39 and 139°C (−38 and 282°F)

      Replace the component:Q8 Control Solenoid Valve Assembly

    • If between −39 and 139°C (−38 and 282°F)
  3. Verify the following parameters are within 8°C (14°F) of each other:
    • TCM Power-Up Temperature
    • TCM Temperature
    • If not within 8°C (14°F) of each other

      Replace the component:Q8 Control Solenoid Valve Assembly

    • If within 8°C (14°F) of each other
  4. Operate the cold vehicle above 55 km/h (35 MPH) for 10 min.

    Verify the following parameters are within 25°C (45°F) of each other:

    • TCM Temperature
    • Transmission Fluid Temperature
    • If not within 25°C (45°F) of each other

      Replace the component:Q8 Control Solenoid Valve Assembly

    • If within 25°C (45°F) of each other
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets

      Replace the component:Q8 Control Solenoid Valve Assembly

    • If the DTC is not set
  6. All OK.
Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification