P0668
DTC P0667, P0668, or P0669
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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
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, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0658, 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.
* Brake torque is not active.
* Engine speed is 400-7,500 RPM for 5 s.
* Ignition voltage is greater than 8.5 V.
* Engine torque signal is valid.
* Accelerator pedal position signal is valid.
P0668
* Engine speed is 400-7,500 RPM for 5 s.
* Ignition voltage is greater than 8.5 V.
P0669
* DTC P0716, P0717, P0722, or P0723 is not set.
* Engine speed is 400-7,500 RPM.
* Ignition voltage is greater than 8.5 V.
Conditions for Setting the DTC
P0667
* TCM detects a 20-50°C (36-90°F) or greater difference between the transmission fluid temperature and TCM substrate temperature, which depends on the average of the transmission fluid temperature, TCM substrate temperature, and TCM power up temperature.
* TCM detects an 8-10°C (14-18°F) or greater difference between the TCM power up temperature and TCM substrate temperature, which depends on the average of the transmission fluid temperature, TCM substrate temperature, and TCM power up temperature.
* Above conditions have to be met for 5 min within a 6 min period.
P0668
TCM temperature is -249°C (-416°F) or less for 1 min.
P0669
TCM temperature is 249°C (480°F) or greater for 1 min.
Action Taken When the DTC Sets
* DTCs P0667, P0668, and P0669 are Type B DTCs.
* TCM defaults the TCM substrate temperature to a calculated temperature based on the TCM power up temperature.
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 transmission fluid temperature sensor output. During a road test, the TCM temperature should steadily increase to a normal operating temperature, and then stabilize.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views A/C Compressor Clutch
* Inline Harness Connector End Views X100
Description and Operation
* Transmission General Description Transmission General Description
* Transmission Component and System Description Transmission Component and System Description
* Electronic Component Description Electronic Component Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify the scan tool TCM Temperature parameter is between -249 and +249°C (-416 and +480°F).
• If not between -249 and +249°C (-416 and +480°F)
Replace the Q8 Control Solenoid Valve Assembly.
• If between -249 and +249°C (-416 and +480°F)
3. Verify the scan tool TCM Temperature parameter increases greater than 2°C (3.5°F) after operating the vehicle at 64 km/h (40 mph) for 10 min.
• If the temperature does not increase greater than 2°C (3.5°F)
Replace the Q8 Control Solenoid Valve Assembly
• If the temperature increases greater than 2°C (3.5°F)
4. 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.
5. Verify the DTC does not set.
• If the DTC sets
Replace the Q8 Control Solenoid Valve Assembly
• If the DTC does not set
6. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repairs.
* Perform the Reset Transmission Adapts Reset Procedure following all transmission repairs.
* Control Module References Control Module References for Control Solenoid Valve Assembly replacement, programming, and setup.