2009 GMC Sierra 2500 HD Problem Reports

Most Reported 2009 GMC Sierra 2500 HD Problem Reports

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One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.

Gas engines only
A Loose or worn gas cap may cause Check Engine Light to illuminate.