Sierra HD Diesel

The 2025 GMC Sierra HD adds more standard features. Adaptive cruise control with trailering assist now comes standard on AT4 and Denali trims. The trailer-brake controller is now standard on all models. Front and rear parking sensors are now available on Pro and SLE as part of the Pro Safety Plus package. The newly introduced 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 and 975 lb-ft of torque. The lineup includes 2500HD and 3500HD models, in Regular Cab, Extended Cab and Crew Cab.