2026 GMC Sierra 2500 HD AT4

From the dealer

Meet the 2026 GMC Sierra 2500HD AT4, a heavy-duty pickup engineered to handle demanding work and premium weekend adventures with equal capability. - Duramax 6.6L V8 Turbodiesel engine with 470 hp and 975 lb-ft of torque - 4WD with 2-Speed Active Transfer Case for confident off-road and winter performance - Max Trailering Package with integrated trailer guidance system and hitch view technology - AT4 Premium Plus Package combining luxury comfort with rugged capability - Bose Premium 7-Speaker Sound System with SiriusXM and Apple CarPlay/Android Auto integration - Heated and ventilated leather front seats with 10-way power adjustment and lumbar support - Spray-on bedliner with GMC logo and power-retractable assist steps - Advanced safety suite: automatic emergency braking, lane departure warning, rear cross traffic alert, and surround-view camera system - 15-inch diagonal head-up display and wireless smartphone charging - Electronic stability control and hill descent control for enhanced traction management The Sierra 2500HD AT4 combines serious engineering with practical daily-use features. The Duramax diesel engine delivers the torque you need for significant towing and hauling, while the 10-speed automatic transmission optimizes both efficiency and power delivery. The 4WD system with electronic-locking transfer case gives you confidence on job sites, mountain passes, and unimproved terrain. The pickup box includes a 120-volt power outlet, and the spray-on bedliner protects your investment through years of use. Inside, luxury and function coexist without compromise. The heated leather seats adjust multiple ways, the dual-zone climate control keeps front passengers comfortable regardless of conditions, and the wireless charging pad keeps your devices ready. The Bose audio system with SiriusXM trial subscription and smartphone integration transforms your commute or work day. A 15-inch head-up display puts critical information directly in your line of sight. Safety technology is comprehensive. Automatic emergency braking activates when potential collisions are detected. Lane departure warning alerts you if you drift unintentionally. The rear cross traffic alert and 360-degree surround-view camera system help you park and maneuver with precision. Following distance indicator and forward collision alert add additional awareness layers. OnStar provides emergency communication and remote vehicle services. The exterior reflects AT4 design intentionality. Deep-tinted glass reduces interior glare and heat buildup. Rain-sensing wipers automatically adjust to weather conditions. Black power-retractable assist steps make climbing into the bed easier. The high-gloss black 20-inch aluminum wheels and gloss black header grille convey purpose and refinement. This 2026 Sierra 2500HD AT4 represents GMC's commitment to building trucks that excel at work, perform on challenging terrain, and deliver comfort during everyday driving. The combination of diesel power, advanced safety technology, premium materials, and practical bed features creates a vehicle suited to owners who refuse to compromise. Premier Cadillac Buick GMC of Carlsbad is proud to serve drivers throughout Carlsbad, Oceanside, Encinitas, San Marcos, Vista, Escondido, Rancho Santa Fe, Del Mar, Solana Beach, Cardiff-by-the-Sea, La Costa, Bressi Ranch, Rancho Bernardo, Poway, Fallbrook, Bonsall, Valley Center, Camp Pendleton, Carmel Valley, and all of North County San Diego. Whether you're shopping for a new Cadillac Escalade, LYRIQ, Optiq, XT5, XT6, Buick Envista, Encore GX, Enclave, GMC Sierra 1500, Sierra HD, Yukon, Yukon XL, Hummer EV, Canyon, Acadia, Terrain, or a quality pre-owned vehicle, our experienced team is committed to delivering a transparent, pressure-free buying experience. Sales 760-653-0332