OnStar®

If equipped, this vehicle has a comprehensive, in-vehicle system that can connect to a live Advisor for Emergency, Security, Navigation, Connection, and Diagnostic Services. See OnStar Overview on page 14‑1 for more information.

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    Express Down Windows
    Windows that have the express&-down feature allow the windows to be lowered without holding the switch. Press the window switch fully and release it to activate the express&-down feature. ...

    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 ...

    Calling for Assistance
    When calling Roadside Assistance, have the following information ready: • Your name, home address, and home telephone number • Telephone number of your location • Location of the vehicle • ...