See also:

Powertrain details
The GMC Sierra All Terrain HD concept is propelled by the new, production 6.6L Duramax turbo-diesel V-8 and Allison 1000 six-speed automatic transmission powertrain combination offered in the 2011 ...

Lane Departure Warning (LDW)
For vehicles with this feature, read the entire section before using it. WARNING The LDW system does not steer the vehicle and is an aid to help the vehicle stay in the driving lane. The LDW syste ...

Other Navigation Services Available from OnStar
OnStar eNav: Allows subscribers to send destinations from Google Maps™ and MapQuest.com to their Turn-by-Turn Navigation or screen-based navigation system. When ready, the directions will be dow ...