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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 Four-Wheel Drive Does Not Engage Four-Wheel Drive Does Not Disengage Front Drive Axle Actuator Replacement FRONT AXLE WILL NOT DISENGAGE 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. 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 Reference Information Schematic Reference
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 1. If this is occurring without DTC C0379 setting it is likely related to a mechanical issue. Refer to Four-Wheel Drive Does Not Disengage . 2. If no mechanical issue is found replace the front axle actuator. 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 Four-Wheel Drive Does Not Engage Four-Wheel Drive Does Not Disengage Front Drive Axle Actuator Replacement TRANSFER CASE SHIFT CONTROL SWITCH INOPERATIVE 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.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Diagnostic Procedure Instructions provides an overview of each diagnostic category. Circuit/System Description The active transfer case mode switch circuit consists of 5 modes. The transfer case shift control The transfer case shift control module constantly monitors this signal voltage to determine the When each of the modes are selected they complete a circuit through their own specific resistor. Reference Information 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 Diagnostic Aids If the 5-volt reference or the switch signal wire are shorted to ground the scan tool can show up
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
to 7.5 volts. Circuit/System Testing 1. Review the scan tool data list mode switch selected and select difference mode with the transfer case shift control switch. Does the mode switch selected parameter on the scan tool 2. If the modes change according to the scan tool replace the transfer case control module, reprogram, complete the motor learn procedure. If the modes on the scan tool not change Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Transfer Case Shift Control Switch Replacement (Without SLT) or Transfer Case Control Module References for TCSCM replacement, setup, and programming Transfer Case High/Low Clutch Reset NO CORRECTION FOR SLIP IN ALL-WHEEL DRIVE MODE 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. Circuit/System Description When transfer case is in auto 4WD mode the transfer case control module monitors the front Reference Information Schematic 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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