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Test Description

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2)  - This DTC may set as a result of other Passlock System problems. Diagnose any BCM DTCs prior to continuing with this diagnostic.
  2. 3)  - A DTC B3031 may set in the body control module (BCM) during the Password Learn Procedure.
    3. Fig 1: DTC P1631 Diagnosis
    G01712889Courtesy of GENERAL MOTORS CORP.
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