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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: Control Module Temperature Sensor Performance

DTC P0668: Control Module Temperature Sensor Circuit Low Voltage

DTC P0669: Control Module Temperature Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

TCM Temperature Sensor

P0668

P0669

-

P0667

Circuit/System Description

The transmission control module (TCM) temperature sensor is located inside of the control solenoid valve assembly which has no serviceable components. 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

P0667

    • DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0401, P042E, P0658, P0667, P0668, P0669, P06AD, P06AE, P0712, P0713, P0716, P0717, P0722, P0723, P0962, P0963, P0966, P0967, P0970, P0971, P215C, P2720, P2721, P2729, or P2730 is not set.
    • The engine torque signal is valid.
    • The ignition voltage is 9.0 volts or greater.
    • The engine speed is greater than 400 RPM for 5 seconds or greater.
    • The throttle position signal is valid.

P0668

    • The ignition voltage is 9.0 volts or greater.
    • The engine speed is greater than 400 RPM for 5 seconds or greater.
    • DTC P0668 is not set.

P0669

    • DTC  P0669, P0716, P0717, P0722, or P0723 is not set.
    • The ignition voltage is 9.0 volts or greater.
    • The engine speed is greater than 400 RPM for 5 seconds or greater.

Conditions for Setting the DTC

P0667

    • The difference between the transmission fluid temperature (TFT) and TCM substrate temperature is greater than 20-50°C (36-90°F), depending on the average of the TFT, TCM substrate, and TCM power up temperatures.
    • The difference between the TCM power up temperature and TCM substrate temperature is greater than 8-10°C (14-18°F) depending on the average of the TFT, TCM substrate, and TCM power up temperatures.
    • The above conditions have to be met for 5 minutes within a 6 minute period.

P0668

The TCM internal temperature is 254°C (489°F) or greater for 1 minute.

P0669

The TCM internal temperature is -254°C (-425°F) or less for 1 minute.

Action Taken When the DTC Sets
    • DTCs P0667, P0668, and P0669 are Type B DTCs.
    • The TCM defaults to using the TCM power up temperature sensor value in place of the TCM temperature value.

Conditions for Clearing the DTC

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

Diagnostic Aids

The TCM temperature sensor is located inside of the control solenoid valve assembly and its output should resemble that of the TFT sensor output.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

    •  Component Connector End Views
    •  Inline Harness Connector End Views

Description and Operation

    •  Transmission General Description
    •  Transmission Component and System Description
    •  Electronic Component Description

Electrical Information Reference

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

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification
  1. Ignition ON, engine OFF. Verify the scan tool TCM Temperature parameter is between -254 and +254°C (-425 and +489°F).
    2. ⇒If not within the specified range, replace the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
  2. Operate the vehicle at 64 km/h (40 mph) for 10 minutes. Monitor the TCM Temperature parameter and the Transmission Fluid Temperature parameter with a scan tool. The TCM Temperature parameter should increase by more than 2°C (3.5°F). Also, the TCM Temperature parameter and the Transmission Fluid Temperature parameter should be within 20°C (36°F) of each other.
    3. ⇒If the TCM Temperature parameter does not increase by greater than 2°C (3.5°F) or the TCM Temperature parameter value is not within 20°C (36°F) of the Transmission Fluid Temperature parameter, then replace the Q8 control solenoid valve assembly.
  3. After performing the above steps, verify that the DTC does not reset by operating 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. If the vehicle passes the Circuit/System Verification procedure, refer to Testing for Intermittent Conditions and Poor Connections .

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

       Note: Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .

    • Refer to Control Module References for control solenoid valve assembly replacement, set-up, and programming.
    • Perform the Transmission Adaptive Values Learn following all transmission related repairs.
   


© Copyright Chevrolet. All rights reserved
   


© Copyright Chevrolet. All rights reserved