GM Service Manual Online
For 1990-2009 cars only

DTC

Diagnostic Procedure

Modules

B1327

DTC B1327

BCM, ONS

B1328

DTC B1328

BCM

P0560

DTC P0560

ECM (L81)

P0562

DTC P0562

ECM (L61)

P0563

DTC P0563

ECM (L61)

P0621

DTC P0621

ECM (L61)

P2500

DTC P2500

ECM (L81)

P2501

DTC P2501

ECM (L81)