GM Service Manual Online
For 1990-2009 cars only

DTC

Diagnostic Procedure

Module(s)

21/31

Diagnostic Trouble Code (DTC) List in Lighting Systems

BCM

22/32

Diagnostic Trouble Code (DTC) List in Lighting Systems

BCM

23/33

Diagnostic Trouble Code (DTC) List in Retained Accessory Power

BCM

24/34

Diagnostic Trouble Code (DTC) List in Restraints

BCM

35 without 25

Diagnostic Trouble Code (DTC) List In Theft Deterrent

BCM

41

Diagnostic Trouble Code (DTC) List in Keyless Entry

BCM

42

Diagnostic Trouble Code (DTC) List in Keyless Entry

BCM

43

Diagnostic Trouble Code (DTC) List in Keyless Entry

BCM

44

Diagnostic Trouble Code (DTC) List in Keyless Entry

BCM

45

Diagnostic Trouble Code (DTC) List in Keyless Entry

BCM

B1000

DTC B1000

EBCM, IPC, PCM, SDM