Under the Hood

GM's two-mode hybrid system enables "full" hybrid operation with the capability to cruise on electric power up to 30 mph. The gas engine kicks in if more acceleration is needed, as well as at higher speeds; for maximum grunt, the electric motors and gas engine work together.

At the heart of the Sierra Hybrid is a 6.0-liter V-8 that teams with GM's Electrically Variable Transmission, which integrates two 60-kilowatt electric motors. The motors draw power from a 300-volt battery pack, which recharges itself off the friction generated when you hit the brakes. The engine makes 332 horsepower and enables a towing capacity of 6,100 pounds with rear-wheel drive and 5,900 pounds with four-wheel drive. That's not as much as the regular Sierra's 10,500-pound maximum towing capacity, but it's not too shabby for a hybrid.

    See also:

    Battery
    Refer to the replacement number on the original battery label when a new battery is needed. WARNING Battery posts, terminals, and related accessories contain lead and lead compounds, chemicals known ...

    Trip/Fuel Menu Items
    (Trip/Fuel): Press this button to scroll through the following menu items: ODOMETER Press the trip/fuel button until ODOMETER displays. This display shows the distance the vehicle has been driven i ...

    Bluetooth Controls
    Use the buttons located on the steering wheel to operate the in-vehicle Bluetooth system. See Steering Wheel Controls on page 5‑2 for more information. (Push To Talk): Press to answer incomin ...