Buick Regal: Diagnostic Information and Procedures

 Odor Correction

Eliminating Air Conditioning (A/C) Odor Odors may be emitted from the heat and air conditioning system primarily at start up in hot, humid climates. When the blower motor fan is turned on, an unpleasant, musty odor may be released into the passenger compartment. The following conditions may cause

 DTC P0856

Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptor DT