Sierra HD

The 2026 GMC Sierra HD lineup includes 2500HD and 3500HD models, in Regular Cab, Extended Cab and Crew Cab. Two new exterior colors are offered and MultiPro Tailgate is now available on SLT. Adaptive cruise control with trailering assist is standard on AT4 and Denali trims. The trailer-brake controller is standard on all models. Front and rear parking sensors are available on Pro and SLE as part of the Pro Safety Plus package. The Sierra HD Denali Ultimate is equipped with unique design enhancements and premium interior appointments. The powerful 6.6L Duramax Turbo-Diesel engine is available delivering 470 hp.