2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 907
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for TCSCM replacement, setup, and programming
* Transfer Case High/Low Clutch Reset (See: Transmission and Drivetrain/Transfer Case/Testing and Inspection/Symptom Related
Diagnostic Procedures/MP 3010-NP0/Transfer Case High/Low Clutch Reset)
* Four-Wheel Drive Does Not Engage (See: Transmission and Drivetrain/Differential Assembly/Testing and Inspection/Front Drive
Axle/Four-Wheel Drive Does Not Engage)
* Four-Wheel Drive Does Not Disengage (See: Transmission and Drivetrain/Differential Assembly/Testing and Inspection/Front Drive
Axle/Four-Wheel Drive Does Not Disengage)
* Front Drive Axle Actuator Replacement (See: Powertrain Management/Transmission Control Systems/Actuators and Solenoids -
Transmission and Drivetrain/Actuators and Solenoids - Differential/Actuator/Service and Repair)
MP 3023/3024-NQH - Transfer Case
DTC C0379
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 C0379 01
- Front Axle System Short to Battery
DTC C0379 02
- Front Axle System Short to Ground
DTC C0379 04
- Front Axle System Open Circuit
DTC C0379 08
- Front Axle Switch Circuit Signal Invalid
Diagnostic Fault Information
Circuit/System Description
The front axle control circuit consists of an electric motor actuator which engages and disengages the front axle. The front axle actuator motor
consists of a permanent magnetic motor, a worm gear controlled plunger, a front axle switch and an electronic control circuit within the actuator
assembly.
The front axle actuator consists of the following circuits:
* An Ignition 1 voltage circuit
* An axle switch signal circuit
* An axle actuator control circuit
* A ground circuit
When a shift to 4WD Auto, 4WD HI, or 4WD LO is requested, the transfer case shift control module (TCCM) engages the front axle by grounding
