2026 GMC Sierra 2500 HD AT4

From the dealer

The 2026 GMC Sierra 2500HD AT4 represents a serious choice for those who demand capability without compromise. This White beauty combines powerful performance with thoughtfully designed features that make every drive purposeful and controlled. - 6.6L V8 Duramax Turbodiesel engine with 470 hp and 975 lb-ft of torque - 10-Speed Automatic transmission with 2-Speed Active Transfer Case - 4WD with Off-Road Suspension and Hill Descent Control - Premium GMC Infotainment System with Apple CarPlay and Android Auto - Bose Premium 7-Speaker Sound System with SiriusXM 360L - Advanced safety suite including Automatic Emergency Braking and Rear Cross Traffic Alert - Lane Departure Warning and Forward Pedestrian Braking systems - HD Surround Vision with Bed View Camera and Trailer Viewing provisions - Heated and ventilated leather front seats with 10-way power adjustment - Multicolor 15 Head-Up Display - Off-Road High Clearance Step Bars with Power-Retractable Assist Steps - Spray-on Pickup Bedliner with GMC Logo - Wireless Phone Projection and Wireless Charging capability - AT4 Premium Plus Package with premium features and appointments - Gooseneck/5th Wheel Prep Package for heavy-duty towing applications Built for both work and weekend adventures, the Sierra 2500HD AT4 delivers the Duramax diesel advantage that serious truck owners have trusted for years. The Duramax 6.6L V8 Turbodiesel engine produces commanding torque for hauling and towing, while the 10-speed automatic ensures smooth power delivery across all driving conditions. The 4WD system with active transfer case provides the control you need whether navigating challenging terrain or managing winter weather. The AT4 package elevates this truck with authentic truck design and premium appointments. Power-retractable assist steps, gloss black grille treatments, and an off-road-ready suspension platform demonstrate GMC's commitment to capability. The spray-on bedliner protects your investment, while the gooseneck prep package positions this Sierra for serious towing applications where precision and control matter most. Inside, the cabin reflects a truck built for those who demand more. Heated and ventilated leather seats with memory settings ensure comfort during long hauls, while the Bose premium audio system with SiriusXM 360L keeps you connected and entertained. The 15-inch head-up display puts critical information directly in your line of sight, and HD Surround Vision with multiple camera angles gives you complete awareness from every angle. Wireless phone projection and charging eliminate cord clutter on your dashboard. Safety technology throughout the Sierra 2500HD AT4 works proactively to keep you, your cargo, and those around you protected. Automatic emergency braking, lane departure warning, forward pedestrian braking, and rear cross traffic alert represent comprehensive awareness. The safety alert seat provides tactile feedback when potential hazards develop, giving you the confidence that comes from advanced protection systems working on your behalf. Whether you're managing a job site, towing a boat to the lake, or heading into backcountry terrain, this 2026 Sierra 2500HD AT4 brings together diesel efficiency, capability-focused technology, and truck-specific design. The combination of Duramax performance, AT4 refinement, and modern safety systems makes this Sierra the right choice for owners who understand the value of purpose-built truck engineering. 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 Ca