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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 930 (Theft Deterrent System) >> Diagnostic Information and Procedures >> DTC P1631: PCM Did Not Receive A Valid Password >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. 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. This DTC may set as a result of other Passlock System problems. Diagnose any BCM DTCs prior to continuing with this diagnostic.
  2. A DTC B3031 may set in the body control module (BCM) during the Password Learn Procedure.
    Fig 1: DTC P1631
    G01476757Courtesy of GENERAL MOTORS CORP.

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