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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 914 (Transfer Case - Mp 3023-NQH) >> Diagnostic Information and Procedures >> DTC C0398 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the RPS sensor for damage at the mating surface with the rotational position shaft.

  1. If the RPS sensor shows damage at the mating surface then replace the RPS sensor. If no damage is found attempt to turn the shaft while the transfer case in stationary in one mode.
  2. If the shaft can be turned then internal damage has occurred to this shaft, refer to transfer case disassemble and inspection  and repair as necessary. If no damage is found and the RPS sensor seems to show a steady degrees rotation reading on the scan tool data list then replace the transfer case two/four wheel drive actuator.
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