GM Service Manual Online
For 1990-2009 cars only

DTC

Diagnostic Procedure

Module

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

B2945

DTC B2945

BCM

B2955

DTC B2955

BCM

P1626

DTC P1626

PCM

P1630

DTC P1630

PCM

P1631

DTC P1631

PCM

P1632

DTC P1632

PCM

PXXXX Other PCM DTCs

Refer to Diagnostic Trouble Code (DTC) List in Engine Controls - 4.2L