P0669
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 temperature sensor is located inside of the control solenoid valve assembly which has no serviceable parts. The Transmission Control Module temperature sensor provides the temperature of the Transmission Control Module substrate. This temperature reading is used in various diagnostic routines in the Transmission Control Module software. This fault is handled inside the Transmission Control Module and no external circuits are involved.
Conditions for Running the DTC
DTC P0667
* TCM DTC: P0658, P0668, P0669, P06AD, P06AE, P0716, P0712, P0713, P0717, P0722, P0723, P0962, P0963, P0966, P0967, P0970, P0971, P215C, P2720, P2721, P2729, or P2730 is not set.
* ECM 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, or P042E is not set.
* Engine speed is 400 RPM or greater for 5 seconds.
* Ignition voltage is between 8.6-32 V.
* Brake torque is not active.
* Engine torque signal is valid.
* Throttle position signal is valid.
DTC P0668
* Engine speed is 400 RPM or greater for 5 seconds.
* Ignition voltage is between 8.6-32 V.
DTC P0669
* DTC P0716, P0717, P0722 or P0723 is not set.
* Engine speed is 400 RPM or greater for 5 seconds.
* Ignition voltage is between 8.6-32 V.
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 temperature.
* The above conditions have to be met for 5 minutes.
P0668
The TCM internal temperature is -249°C (-416°F) or less for 1 minute.
P0669
The TCM internal temperature is 249°C (480°F) or greater for 1 minute.
Action Taken When the DTC Sets
* DTCs P0667, P0668, and P0669 are Type B DTCs.
* The TCM defaults to an estimated value for the substrate temperature.
Conditions for Clearing the DTC
DTCs P0667, P0668, and P0669 are Type B DTCs.
Diagnostic Aids
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 5 Bow Lowered Switch (CM7)
* Inline Harness Connector End Views X102
Description and Operation
* Electronic Component Description Electronic Component Description
* Transmission General Description Transmission General Description
* Transmission Component and System Description Transmission Component and System 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. Engine idling at normal operating temperature.
2. Verify the scan tool Transmission Control Module Temperature parameter is between -247 and +247°C (-412 and +477°F).
• If not between -247 and +247°C (-412 and +477°F)
Replace the Q8 Control Solenoid Valve Assembly.
• If between -247 and +247°C (-412 and +477°F)
3. Verify the scan tool Transmission Control Module temperature parameter increases greater than 2°C (3.5°F) after operating the vehicle at 64 km/h (40 mph) for 10 minutes.
• If the temperature does not increase greater than 2°C (3.5°F)
Replace the Q8 Control Solenoid Valve Assembly.
• If the temperature does increase greater than 2°C (3.5°F)
4. Verify the scan tool Transmission Control Module Temperature and the Transmission Fluid Temperature parameters are within 10°C (18°F) of each other.
• If the temperature is not within 10°C (18°F)
Replace the Q8 Control Solenoid Valve Assembly.
• If the temperature is within 10°C (18°F)
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
6. Verify the DTC does not set.
• If the DTC sets
Replace the Q8 Control Solenoid Valve Assembly.
• If the DTC does not set
7. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Perform the Reset Transmission Adapts Reset Procedure following all transmission related repairs.
* Refer to Control Module References Control Module References for control solenoid valve assembly replacement, programming, and setup.