Key Features of the 2026 GMC Sierra 2500 HD

Duramax 6.6L Turbo-Diesel V8

When your plans include substantial towing or frequent long hauls, the available Duramax 6.6L Turbo-Diesel V8 stands out as a smart choice. Rated at 470 horsepower and a towering 975 lb-ft of torque, this engine delivers confident acceleration with a linear, controlled surge that makes merging, climbing, and passing feel remarkably composed for a heavy-duty truck. In independent testing referenced for the Sierra HD lineup, diesel-equipped 2500 models have recorded brisk 0-60 mph times for the segment, underscoring how readily the Duramax responds. Beyond raw output, diesel refinement also shows up in highway stability and consistent pulling power over grades. For drivers who routinely tow large campers, equipment, or boats, the Duramax powertrain remains a highlight of the 2026 Sierra 2500 HD’s capability story.

10-Speed Automatic Transmission

Both the gas and diesel engines pair with a 10-speed automatic transmission that keeps the Sierra 2500 HD in the sweet spot of its powerband. The close gear spacing helps smooth out shifts and supports steady torque delivery, which you notice most when towing on rolling terrain or navigating city traffic with payload in the bed. With rear-wheel drive or available four-wheel drive, the transmission’s calibration makes the truck feel responsive yet unruffled. In everyday driving, that translates to fewer hunting shifts and more poised progress. Hitch up a trailer, and the transmission’s logic contributes to control and confidence, enhancing both acceleration from a stop and composure on downhill grades.

ProGrade® Trailering with Up to 15 Camera Views

Available ProGrade® Trailering technologies bring clarity to every phase of the tow. With up to 15 camera views offered on Sierra HD, you can monitor hitch alignment, observe the bed, keep an eye along the sides of the trailer while changing lanes, and use additional perspectives that help build confidence in tight maneuvering. The expanded visibility is particularly helpful in crowded job sites, busy highways, or while backing into a narrow campsite. For shoppers stepping up into larger trailers, these camera angles help flatten the learning curve by turning blind spots into manageable, visual references. Combined with trailering-assist features and a robust chassis, the Sierra 2500 HD makes towing feel more approachable for both seasoned owners and first-time heavy-duty buyers.

13.4-Inch Center Touchscreen with Google built-in

A modern cabin is part of the Sierra HD experience. Many configurations offer a 13.4-inch center touchscreen with Google built-in, so you can access Google Assistant, Google Maps, and Google Play without plugging in your phone. Wireless Apple CarPlay and Android Auto compatibility are supported across the lineup, and a 12.3-inch digital gauge cluster is available to bring crisp, configurable data into your natural line of sight. The interface prioritizes clarity and low glance time, making it easier to keep attention on the road while staying connected. Available premium audio heightens the experience, while multiple USB ports and logical storage keep devices and daily essentials organized.

MultiPro™ Tailgate

GMC’s available MultiPro™ Tailgate is a versatile tool that adds six helpful functions to the truck’s rear deck. Use it as a conventional tailgate, a load stop for longer items, a step for easier bed access, or a work surface for everything from job plans to weekend projects. It’s the kind of ingenuity owners end up using daily, whether you are staging gear, stabilizing cargo, or setting up a quick tabletop. Pair it with available bed lighting, tie-downs, and a 120-volt outlet, and the Sierra 2500 HD’s box area becomes a functional workspace that adapts as your needs change throughout the day.