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

Description

Module

B2721

DTC B2721

BCM

B2722

DTC B2722

BCM

B2723

DTC B2723

BCM

B2735

DTC B2735

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 - 5.7L.

PCM