2026 GMC SIERRA 2500HD

The 2026 GMC Sierra 2500 AT4 Crew Cab 4WD combines heavy-duty Duramax diesel capability with premium AT4 comfort, advanced trailering technology and serious off-road equipment. Finished in Onyx Black with a distinctive Jet Black and Kalahari interior, this Sierra HD is powered by the 6.6L Duramax V8 Turbo-Diesel paired with a 10-speed automatic transmission.

Built for demanding work and recreation, the Sierra 2500 AT4 features a 2-speed electronic Autotrac transfer case, automatic locking rear differential and StabiliTrak with Trailer Sway Control and Hill Start Assist. Digital Variable Steering provides additional control, while the AT4’s 20-inch high-gloss black aluminum wheels and off-road high-clearance steps give this heavy-duty truck a commanding appearance.

Trailering equipment is extensive, with an integrated trailer brake controller, Hitch Guidance, Hitch View and an In-Vehicle Trailering App. This truck also includes the Gooseneck/5th Wheel Prep Package, making it particularly well equipped for customers who regularly tow larger trailers. HD Surround Vision, Bed View Camera and Trailer Side Blind Zone Alert provide additional visibility and awareness around the truck and trailer.

The AT4 Premium Plus Package adds some of the Sierra HD’s most desirable premium features, including a power sunroof, Rear Camera Mirror and a multicolour 15-inch Head-Up Display. A power-sliding rear window, Universal Home Remote and LED roof marker lamps further enhance the package.

Inside, the Jet Black and Kalahari cabin combines rugged AT4 character with upscale comfort. Heated and ventilated front seats, heated rear outboard seats, a 10-way power driver’s seat, driver seat and mirror memory and a heated wrapped steering wheel provide excellent year-round comfort. Dual-zone automatic climate control and premium floor liners add further everyday convenience.

Technology is centred around GMC’s 13.4-inch Premium Infotainment touchscreen with Google built-in and navigation capability. Wireless Apple CarPlay and Android Auto, wireless charging, a 12.3-inch reconfigurable Driver Information Centre, Bose premium audio and remote start provide a connected and comfortable driving experience.

The cargo box is ready for serious use with a factory spray-on bedliner, LED bed lighting, 120-volt power outlet and GMC MultiPro Tailgate. The EZ-Lift power lock and release tailgate adds convenience, while power-folding and extending heated trailering mirrors provide the visibility needed when towing.

Sierra HD Pro Safety includes Automatic Emergency Braking, Forward Collision Alert, Front Pedestrian Braking, Lane Departure Warning, Following Distance Indicator, IntelliBeam automatic high beams, Front and Rear Park Assist, Rear Cross Traffic Alert and Driver Safety Alert Seat. Adaptive Cruise Control adds further convenience during longer highway drives.

Dual alternators with a 220-amp primary and 170-amp auxiliary unit provide additional electrical capability, while the High Idle Switch adds functionality for demanding work applications. With its 11,350-lb GVWR, Duramax diesel power, advanced trailering equipment and AT4 Premium Plus Package, this Sierra 2500 is exceptionally well equipped for heavy-duty work, towing and recreation.

As a heavy-duty vehicle, standardized fuel-consumption ratings are not provided for this class.

Feature Benefits

6.6L Duramax V8 Turbo-Diesel provides serious heavy-duty performance for towing hauling and demanding work, 10-speed automatic transmission provides smooth and responsive power delivery, four-wheel drive and 2-speed Autotrac transfer case provide added traction and capability in challenging conditions, automatic locking rear differential helps improve traction when conditions become difficult, AT4 configuration combines off-road capability with premium comfort and distinctive styling, 20-inch high-gloss black aluminum wheels provide a bold appearance, off-road high-clearance steps provide convenient cab access while supporting the AT4’s rugged design, Gooseneck/5th Wheel Prep Package provides added flexibility for heavy trailer applications, integrated trailer brake controller provides greater control when towing properly equipped trailers, Hitch Guidance and Hitch View simplify trailer connection, In-Vehicle Trailering App helps manage important trailer functions, HD Surround Vision provides enhanced visibility around the truck, Bed View Camera provides additional visibility into the cargo box and toward a connected trailer, Trailer Side Blind Zone Alert provides additional awareness alongside a compatible trailer, heated and ventilated front seats provide year-round comfort, heated rear outboard seats provide additional passenger comfort, power sunroof adds natural light and an open-air feel, 15-inch Head-Up Display places important driving information within the driver’s line of sight, Rear Camera Mirror provides an expanded rearward view, Bose premium audio provides an upscale listening experience, 13.4-inch touchscreen with Google built-in provides access to connected features and navigation capability, GMC MultiPro Tailgate provides versatile cargo and work functionality, spray-on bedliner helps protect the cargo box, dual alternators provide additional electrical capability for demanding applications, Adaptive Cruise Control adds convenience during longer highway drives