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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 ...

Storing and Deleting Phone Numbers
The system can store up to 30 phone numbers as name tags in the Hands-Free Directory that is shared between the Bluetooth and OnStar systems, if equipped. The following commands are used to delete an ...

Heated and Ventilated Seats
Heated and Cooled Seat Buttons Shown, Heated Seat Buttons Similar If available, the buttons are on the center console. To operate, the engine must be running. : If available, press to heat the ...