Service Four Wheel Drive Light On DTC C0379

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Service four wheel drive light on with DTC C0379 stored in the TCCM and the front axle actuator inoperative.

1. Check the front axle actuator wiring for chaffing at the a/c compressor clutch.
2. Refer to the wiring repair in SI and secure the front axle actuator wiring harness away from the a/c compressor clutch.
3. Replace the front axle actuator if damaged or inoperative.
4. If no problem is found with the wiring harness, refer to SI Document ID number 641088 for DTC C0379 for further diagnosis.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.