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Schematic Reference Transfer Case Control Schematics Connector End View Reference Component Connector End Views Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Scan Tool Data List Scan Tool Data Definitions Circuit/System Testing The DTC can be set by more than one type of fault. It could be set by faulty wheel speed sensors, 1. This system compares front wheel speeds to rear wheel speeds to determine if slip is occurring and clutch engagement is necessary to correct this condition if the front axle Place the vehicle on a hoist, turn the ignition on, engine off and shift the transfer case 2. Using the scan tool, go into EBCM data display and find the front and rear. Take the vehicle on a short test drive on a level and smooth surface. Compare the front
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
this would cause this DTC to set. Consider checking the EBCM for DTCs for the 3. The next check will be to see if the motor brake is holding. If it does not, this will cause the motor to stay engaged for extended periods of time causing it to exceed the thermal model. With a scan tool clear the DTC, shift the vehicle to 2WD, and monitor the transfer case 4. Next will be checking the transfer case clutch integrity. Place the vehicle for 4 high and take it for a test drive. Clear the DTC if possible. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Control Module References for TCSCM replacement, setup, and programming Transfer Case High/Low Clutch Reset for Motor Learn Procedure Four-Wheel Drive Does Not Engage Front Drive Axle Clutch Fork Inspection Transfer Case Assembly Replacement DTC C0379 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptor
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 System 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 actuator consists of the following circuits: The front axle control circuit, which is also connected to the transfer case shift control The front axle switch circuit, which is also connected to the transfer case shift control An ignition 3 voltage circuit A ground circuit When a shift to AUTO 4WD, 4HI, or 4LO is requested, the transfer case shift control module Circuit Short to Ground Open/High Resistance Short to Voltage Signal Invalid Front Axle System DTC C0379 02 DTC C0379 04 DTC C0379 DTC C0379 08
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
driver. This DTC detects a short to ground, short to voltage or an open circuit. Conditions for Running the DTC The ignition is ON. System voltage is 10.5-18 volts. Conditions for Setting the DTC This DTC sets if the front axle actuator switch shows battery voltage when the actuator is The module also monitors the axle actuator control circuit and sets the DTC if a high Action Taken When the DTC Sets The front axle may be engaged at all times or disengaged at all time depending on the failure The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition Conditions for Clearing the DTC The transfer case shift control module clears the DTC if the condition for setting the DTC is A history DTC clears after 40 consecutive warm up cycles without a fault present. History DTCs can be cleared using a scan tool. Reference Information Schematic Reference Transfer Case Control Schematics Connector End View Reference Component Connector End Views Electrical Information Reference
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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