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Action Taken When the DTC Sets All shifting is disabled until the condition no longer exists. 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 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 An open, high resistance, or short to voltage on the incremental sensor direction signal circuit will
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Testing The incremental sensor impulse signal circuit, incremental direction signal circuit, incremental 1. Disconnect the connector at the transfer case actuator and check the 8-volt reference signal on pin G at the transfer case actuator with a DMM, ignition on, the voltage should read 7.8- If the voltage does not read within the specifications then check the 8-volt reference 2. At the transfer case actuator, with a jumper harness short the 8-volt reference circuit pin G to the incremental impulse signal pin E and note the voltage on the scan tool data display. If the voltage does not read 7.8-8.2 volts check the incremental impulse signal circuit 3. Check the incremental direction circuit for an open, short to ground, high resistance, or a short to voltage by probing pin F at the transfer case actuator and pin 14 and transfer case If all circuit test good replace the transfer case actuator and perform the motor learn 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 Transfer Case Two/Four Wheel Drive Actuator Replacement DTC C0397 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. DTC Descriptor DTC C0397 64 Transfer Case Clutch Performance Actuator Slipping Diagnostic Fault Information Circuit/System Description The transfer case in the Auto 4WD mode attempts to correct for slip by monitoring the front and Conditions for Running the DTC The ignition is ON. System voltage is 10.5-18 volts. Conditions for Setting the DTC The transfer case is unable to correct slip due to a clutch overheat condition as a result in Action Taken When the DTC Sets Shifting is still possible but in a reduced capacity which may cause undesirable slip The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition Conditions for Clearing the DTC Circuit Short to Ground Open/High Resistance Short to Voltage Actuator Slipping Transfer Case Clutch - - - DTC C0397 64
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 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 Motor control A shorting to motor control B could cause this DTC. Circuit/System Testing Check for EBCM DTCs as an incorrect speed sensor reading could cause this issue. If no other Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Transfer Case Disassemble
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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