See also:

Vehicle Overview
GM says the Sierra 1500 Hybrid's gasoline V-8 and electric motors team up for an overall mileage improvement compared with the regular Sierra. The Sierra Hybrid is only available as a rear- or fou ...

Place a Call Using a Stored Number
1. Push . System responds: “OnStar ready.” 2. Say “Call <name tag>.” System responds: “OK, calling <name tag>.” Verify Minutes and Expiration Push and say “minutes” t ...

Cellular Phone Usage
Cellular phone usage can cause interference with the vehicle's radio. ...