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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 231 (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 Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. 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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