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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 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 Engage . 2. If no mechanical issue is found replace the front axle actuator. Repair Procedures
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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