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Problems for specific GMC Sierra 2500 HD years:

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Newest reported 2009 GMC Sierra 2500 HD problems

 

Verified for the GMC Sierra 2500 HD

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

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Verified for the GMC Sierra 2500 HD

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.

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