A loose or worn gas cap could be cause the Check Engine Light to illuminate.
Problems for specific Chevrolet Silverado 2500 HD years:
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Repairpal verified 2009 Chevrolet Silverado 2500 HD problems
The keyless entry system may stop working. Our technicians tell us the key fobs and keyless entry receiver may need to be replaced to correct this fault.
One or both secondary air injection check valves may become restricted causing poor air flow resulting in illumination of the Check Engine Light. It is often recommend to replace both check valves even if a fault code is set for only one bank of cylinders. Replacing only one valve may result in a return trip to the repair shop.