2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1524
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/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 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
* No DTCs 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, P0668, P0669, P06AD, P06AE, P0712,
P0713, P0716, P0717, P0722, P0723, P0962, P0963, P0966, P0967, P0970, P0971, P215C, P2720, P2721, P2729, or P2730.
* Brake torque is not active.
* The engine speed is greater than 400 RPM for 5 seconds or greater.
* The ignition voltage is 8.6 volts or greater.
P0668
* DTC P0668 has set this ignition cycle.
* The engine speed is greater than 400 RPM for 5 seconds.
* The ignition voltage is 8.6 volts or greater.
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 engine speed is greater than 400 RPM for 5 seconds.
* The ignition voltage is 8.6 volts 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掳C (36-90掳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掳C (14-18掳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 temperature is less than -249掳C (-416掳F) or less for 1 minute.
P0669
The TCM temperature is -249掳C (-416掳F) or greater for 1 minute.
Action Taken When the DTC Sets
* DTCs P0667, P0668, and P0669 are Type B DTCs.
* The TCM defaults the TCM substrate temperature to the TCM power up temperature.
