GM Service Manual Online
For 1990-2009 cars only

DTC

Diagnostic Procedure

Module

B0165

DTC B0165 or B0166

HVAC Control Module

B0166

DTC B0165 or B0166

HVAC Control Module

B0233

DTC B0233

HVAC Control Module

B0408

DTC B0408 or B0418

HVAC Control Module

B0418

DTC B0408 or B0418

HVAC Control Module

B3933

DTC B3933

HVAC Control Module

P0530

DTC P0530

PCM

P1546

DTC P1546

PCM