Key Features of the 2026 GMC Sierra 2500 HD

Duramax 6.6L Turbo-Diesel V-8

The heart of the heavy-duty lineup is the available Duramax 6.6-liter Turbo-Diesel V-8, rated at 470 horsepower and 975 lb-ft of torque. That output arrives early and consistently, translating into confident launches with a trailer attached and fewer downshifts on long grades. The Duramax is known for its smooth, quiet demeanor at highway speed, but its real value is how it holds gear under load while keeping temperature and response stable. For customers who tow regularly—equipment trailers, large boats, or fifth-wheel campers—this diesel is the easy choice. It’s matched to the 10-speed automatic that helps keep the engine in its sweet spot and reduces busy shift behavior when towing heavy. If your daily needs include frequent hauling, the diesel’s blend of torque, refinement, and endurance will pay dividends.

10-speed Automatic Transmission

Every 2026 Sierra 2500 HD benefits from a 10-speed automatic transmission calibrated for heavy-duty service. Ratio spacing is optimized so the gasoline 6.6-liter V-8 (401 hp, 464 lb-ft) can stay responsive in stop-and-go conditions, while the Duramax can apply its immense torque efficiently at low rpm. When towing, the 10-speed’s programming works with engine braking to maintain speed on descents, easing reliance on the service brakes. The result is fewer gear-hunting moments and a calmer driving experience, especially on rolling terrain. The transmission’s quick, decisive shifts also contribute to a feeling of agility that’s unusual for a truck of this size, making highway merges and two-lane passing more straightforward. It’s a smart piece of hardware that complements both powertrains and helps the truck feel composed in real-world use.

Trailering Technology with Up to 15 Camera Views

Towing is far easier when you can see what you’re doing. The Sierra 2500 HD’s available camera system offers up to 15 views, including hitch, surround, and available transparent trailer perspectives. These views come alive on the available 13.4-inch center display, making it simpler to line up the ball, monitor safety chains, and check traffic in adjacent lanes with a trailer onboard. Pair the views with the integrated trailering app for custom profiles, light check routines, and maintenance reminders tied to each trailer. Together, this suite shortens setup time at job sites and adds a wider field of vision on the highway, particularly helpful with long cargo or enclosed trailers. It’s an ecosystem built around real towing needs, making the Sierra 2500 HD a more confident partner for demanding trips.

MultiPro Tailgate

The available MultiPro tailgate turns the bed into a multipurpose workspace. With six functional positions—including primary, load stop, full-width step, and inner gate—MultiPro accommodates tasks ranging from loading irregular cargo to stepping up into the bed with ease. Built-in step positions are robust and confidence-inspiring, and the load stop helps keep longer materials from shifting when the gate is down. For crews, it reduces wasted motion and time; for solo owners, it adds safety and convenience when hauling equipment or weekend gear. Bed-corner steps and optional LED lighting further improve access and visibility, while available tie-down points and a 120-volt outlet broaden what you can tackle without extra accessories. The system’s thoughtful details make day-to-day loading and unloading faster and more secure.

13.4-inch Infotainment with Google Built-in

Available technology inside the Sierra 2500 HD doesn’t just look modern—it works harder for you. The optional 13.4-inch infotainment display supports Google Built-in for intuitive voice controls, native navigation, and seamless app integration. Wireless Apple CarPlay and Android Auto keep your smartphone connection free of cords, while the available 12.3-inch digital gauge cluster presents crisp, configurable data at a glance. For longer drives or work-zone calls, optional Bose audio elevates clarity and reduces fatigue. The interface is designed around quick access to the features you use most—towing apps, camera views, and navigation—so you spend less time tapping through sub-menus. It’s the right blend of sophistication and purpose, tailored to the realities of heavy-duty ownership.