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Overview
The GMC Sierra All Terrain HD concept is an exploration of heavy-duty truck capability combined with greater off-road versatility. It is highlighted by a bold exterior design, enhanced all-terrain ...

License Plate Lamp
To replace one of these bulbs: 1. Remove the two screws holding each of the license plate lamps to the liftgate trim. 2. Turn and pull the license plate lamp forward through the liftgate trim open ...

Overheated Engine Protection Operating Mode
If an overheated engine condition exists and the ENGINE POWER IS REDUCED message displays, an overheat protection mode which alternates firing groups of cylinders helps to prevent engine damage. In th ...