GM Service Manual Online
For 1990-2009 cars only

Important: Diagnose all Bxxxx codes prior to diagnosing any Pxxxx code.

DTC

Diagnostic Procedure

Module(s)

B2947

DTC B2947

BCM

B2948

DTC B2948

BCM

B2957

DTC B2957

BCM

B2958

DTC B2958

BCM

B2960

DTC B2960

BCM

B3031

DTC B3031

BCM

B3033

DTC B3033

BCM

P1626

DTC P1626

PCM

P1631

DTC P1631

PCM

P1632

DTC P1632

PCM

PXXX-Other PCM DTCs

PXXXX Other PCM DTCs

Refer to Diagnostic System Check - Engine Controls in Engine Controls - 4.3L

PCM