Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
DTC is an indication that restraints identification stored in BCM and SDM DO NOT match or that VIN stored in PCM and SDM DO NOT match. If PCM or BCM were replaced, modules will need to be reprogrammed. If BCM or SDM were replaced, Vehicle Theft Deterrent (VTD) system will need to be reprogrammed.