Ratings: 2015 GMC Sierra 2500HD Ratings - Consumer Reports
The Sierra HD and its twin the Chevrolet Silverado HD are designed for heavy towing and hauling. The 6.0-liter V8 and 6.6-liter turbodiesel are both mated to a six-speed automatic. The latter works well, and employs a heavy-duty Allison-made transmission. We measured 14 mpg overall with the diesel. The LTZ trim has a luxurious cabin but ascending to into it is quite a climb.
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There are 11 recalls on this vehicle. Learn More.
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