2026 GMC Sierra 2500 HD AT4

From the dealer

This 2026 GMC Sierra 2500HD AT4 offers the capability and comfort you need for work and life's adventures, backed by proven diesel performance and premium amenities. - 6.6L V8 Duramax Turbodiesel engine with 470 hp and 975 lb-ft of torque - 10-Speed Automatic transmission with 4WD - AT4 Premium Plus Package with premium interior and exterior upgrades - Bose Premium 7-Speaker Sound System with SiriusXM and Apple CarPlay/Android Auto - Technology Package including 15 Head-Up Display and Wireless Phone Projection - X31 Off-Road Package with Hill Descent Control and suspension enhancements - Gooseneck/5th Wheel Prep Package for towing versatility - Heated and ventilated perforated leather front seats with 10-way power adjustment - Heated rear seats and split-folding rear seat configuration - Power sunroof with deep-tinted glass - HD Surround Vision with multiple camera systems and park assist - Full suite of safety features including Automatic Emergency Braking and Lane Departure Warning - Engine Block Heater and Exhaust Brake for cold climate capability - Spray-on bedliner with GMC Logo and wireless charging pad The Duramax diesel engine delivers the torque and reliability that working professionals demand. With 975 lb-ft available at 1600 rpm, this truck handles demanding tasks with authority. The 10-speed automatic transmission provides smooth power delivery across all conditions, while the 2-speed active transfer case and off-road suspension give you confidence on challenging terrain. Inside, the AT4 cabin reflects premium attention to detail. Perforated leather seating with heating and ventilation keeps you comfortable through long drives. The 15-inch head-up display projects critical driving information directly in your line of sight, reducing distractions. Power-retractable assist steps, heated steering wheel, and automatic high-beam headlights add daily convenience. Technology connects you seamlessly to your world. The Premium GMC Infotainment System supports Apple CarPlay and Android Auto, while wireless phone projection keeps your device accessible without cables. The in-vehicle trailering system app helps you manage towing with precision. OnStar Services provide emergency communication and remote vehicle access, with three years of service included. Safety systems work together to protect you and your passengers. The bed view camera with trailer viewing software, rear cross traffic alert, and ultrasonic park assist help navigate tight situations. Automatic emergency braking, lane departure warning, and forward pedestrian braking provide an additional layer of protection. Multiple airbags and electronic stability control round out the suite. The exterior commands attention with its gloss black header grille, LED smoked amber roof marker lamps, and 20-inch high-gloss black aluminum wheels. Power-retractable black assist steps and high-clearance off-road design define the AT4 character. Rain-sensing wipers and multiple lighting technologies ensure you see and are seen in all conditions. 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