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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1031 (Transfer Case - Mp 3023/3024-NQH) >> Diagnostic Information and Procedures >> DTC C0387 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra and 2008 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  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 circuits checked good go to next step.
  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 shift lever detent shaft is not binding replace the transfer case actuator.
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