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License Plate Lamp
To replace one of these bulbs: 1. Reach under the rear bumper for the bulb socket. 2. Turn the bulb socket counterclockwise and pull the bulb socket out of the lamp assembly. 3. Pull the old bulb ...

New for 2011
The Sierra Hybrid gets GM's OnStar 9.0 telematics system that GM says provides better voice recognition. GM also said they have worked to cut down on the amount of wind noise occupants hear. ...

Storing an XM Channel as a Favorite
To store a station as a favorite: 1. Tune to an XM channel. 2. Press the FAV button to display the page where the station will be stored. 3. Press and hold one of the six softkeys until a beep soun ...