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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 Ignition 1 voltage circuit and the axle actuator control circuit must be tested for opens, shorts 1. With the ignition on check which DTC is set. If DTC C0379 is set with failure type byte 08 then do the following. Shift the vehicle into 4 high and look at the scan tool data list to see if the front axle 2. Remove the front axle actuator and try to shifting from 4WD to 2WD and see if the states change. If the states change then inspect the front axle for mechanical conditions. Refer to 3. Disconnect the connector at the front axle actuator and check for battery voltage on the ignition 1 circuit. Also check the front axle actuator ground for proper connections. If these circuit test bad repair as necessary checking inline connectors X110 and X109. 4. Check the axle actuator control circuit for an open, short to ground, or short to voltage. If the actuator control circuit checks good, then short the actuator control circuit to
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
transfer case control module, program, and complete the motor learn procedure. If it 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 DTC C0387 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 DTC C0387 59 Unable to Complete Shift Circuit/Component Protection Timeout Diagnostic Fault Information Circuit/System Description The transfer case control module commands shifts through motor A and motor B control circuits Circuit Short to Ground Open/High Resistance Short to Voltage Circuit/Component Timeout Unable to Complete Shift - - - DTC C0387 59
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Conditions for Running the DTC The ignition is ON. System voltage is 10.5-18 volts. Conditions for Setting the DTC A shift request was received but could not be completed within 15 seconds causing this DTC to Action Taken When the DTC Sets All shifting is disabled until condition is corrected. 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
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 1. Ignition off with a DMM check to see if motor A control and motor B control are shorted together after disconnecting the transfer case control module and the transfer case actuator. If motor A control is shorted to motor B control repair circuits as necessary. If the 2. Remove the transfer actuator and check to see if the shift detent shaft is binding. If the shift lever detent shaft is binding refer to Transfer Case Disassemble. If the Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Transfer Case Two/Four Wheel Drive Actuator Replacement Transfer Case Disassemble DTC C0392 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 DTC C0392 01 Rotational Position Sensor Circuit Short to Battery DTC C0392 02 Rotational Position Sensor Circuit Short to Ground
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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