GM Service Manual Online
For 1990-2009 cars only

DTC

Diagnostic Procedure

Module(s)

BXXXX

Diagnostic Trouble Code (DTC) List in Body Control System

Body Control Module (BCM)

CXXXX

Diagnostic Trouble Code (DTC) List in Antilock Brake System

Electronic Brake Control Module (EBCM)

P0502

DTC P0502 in Automatic Transmission/Transaxle

Powertrain Control Module (PCM)

P0503

DTC P0503 in Automatic Transmission/Transaxle

Powertrain Control Module (PCM)

P1554

DTC P1554

Powertrain Control Module (PCM)

P1585

DTC P1585

Powertrain Control Module (PCM)

PXXXX

Diagnostic Trouble Code (DTC) List 3.1L or Diagnostic Trouble Code (DTC) List 3.8L in Engine Controls

Powertrain Control Module (PCM)