GM Service Manual Online
For 1990-2009 cars only

Important: Unless otherwise directed by the Diagnostic System Check diagnose all Bxxxx codes prior to diagnosing any Pxxxx codes.

DTC

Diagnostic Procedure

Module(s)

B2957

DTC B2957

BCM

B2958

DTC B2958

BCM

B2960

DTC B2960

BCM

B3031

DTC B3031

BCM

P1626

DTC P1626

PCM

P1630

DTC P1630

PCM

P1631

DTC P1631

PCM

Pxxxx

Pxxxx other PCM DTCs

Refer to Diagnostic Trouble Code (DTC) List in Engine Controls - 2.5L (LB8) and 3.0L (LW9)

PCM