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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1348 (Transfer Case - Mp 3023/3024-NQH) >> Diagnostic Information and Procedures >> DTC C0397 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that DTC C0306 in not set.
    • If the specified DTC is set diagnose that first.
  2. Verify that no EBCM wheel speed sensor DTCs are set.
    • If the specified DTC is set diagnose that first.
  3. If no other DTCs are found then refer to Transfer Case Disassemble  in order to inspect for possible clutch damage.
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