GM Service Manual Online
For 1990-2009 cars only

DTC

Diagnostic Procedure

DTC Type

Module(s)

P0502

DTC P0502

B

Engine Control Module (ECM)

P0503

DTC P0503

B

Engine Control Module (ECM)

P0801

DTC P0801

C

Engine Control Module (ECM)

P0833

DTC P0833

B

Engine Control Module (ECM)