GM Service Manual Online
For 1990-2009 cars only

DTC

Diagnostic Procedure

Module(s)

B1327

DTC B1327

VTD

B1328

DTC B1328

BCM

B1507

DTC B1507

BCM

B1508

DTC B1508

BCM

P0560

DTC P0560

PCM

P0620

DTC P0620

PCM