Paired with a 6-speed heavy-duty automatic transmission, this engine delivers 360 horsepower and 380 lb.-ft. of torque.
The efficient fuel system and acoustic treated rocker covers contribute to making it our quietest idling HD Duramax Diesel engine ever offered in a Sierra HD.
Joining forces to make the Duramax 6.6L V-8 Turbo Diesel perform at its peak are its large radiator capacity for excellent cooling, a hood scoop induction system that provides cooler induction air temperatures to maximize horsepower, and the capable Allison 1000 6-Speed Automatic Transmission.
Pave the way with HID projector beam headlamps and accented signature GMC LED lighting.
Smart exterior features set the stage for these innovative resources inside the Sierra HD All Terrain:
Sierra HD sets you up for success with the available durable soft-touch instrument panel with aluminum trim and contrast stitching.
The heated, leather-wrapped steering wheel adds a premium touch of warmth.
Provide year-round, personalized comfort for the driver and front seat passenger.
Standard on every new GMC - GMC Pro Grade Protection has you truly protected with features and
- Two maintenance visits
- 3-year / 36,000-mile Bumper-to-Bumper Warranty
- 5-year / 60,000-mile Powertrain Warranty
- 5-year / 60,000-mile Roadside Assistance & Courtesy Transportation
- 3-month trial of OnStar Guidance Plan with a suite of emergency security and diagnostic services
- 5-year OnStar Basic Plan
Below 5 mph, the system provides distance-to-object alerts to help the driver park and avoid nearby detected objects directly ahead or behind the vehicle during low-speed maneuvering.
The GM-patented Safety Alert Seat provides the driver the option of getting haptic seat-bottom vibration pulses instead of audible crash avoidance alerts.