2025 GMC Sierra 2500HD

The 2025 GMC Sierra 2500 HD is available in seven trims: Pro, SLE, SLT, AT4, Denali, AT4X, and Denali Ultimate. The Pro trim comes equipped with 18-inch steel wheels with all-terrain tires, LED signature daytime running lamps, and LED cargo area lighting. Moving up to the SLE and SLT trims adds a chrome grille with horizontal bars and chrome surround. The AT4 and AT4X models feature a signature black chrome grille with dark finished bars, along with a 2-inch factory suspension lift and skid plates for enhanced off-road capability. The Denali showcases an exclusive Vader Chrome grille with a unique mesh pattern, while the range-topping Denali Ultimate adds power-retractable assist steps with LED perimeter lighting. SLT and higher trims benefit from the MultiPro tailgate with six functions and an integrated audio system.

The standard 6.6L V8 gas engine delivers 401 horsepower and 464 lb-ft of torque, providing strong performance for everyday tasks. For maximum capability, the optional 6.6L Duramax Turbo-Diesel V8 generates 470 horsepower and an impressive 975 lb-ft of torque. Both engines pair with an Allison 10-speed automatic transmission, optimizing power delivery and efficiency across various driving conditions. The auto start-stop technology helps reduce fuel consumption during idle situations, particularly in urban environments.

The Sierra 2500 HD demonstrates its heavy-duty capabilities with a maximum towing capacity of 22,500 lbs when equipped with the diesel engine, while the gas engine configuration supports a maximum payload of 3,986 lbs. SLT and higher trims feature an Advanced Trailer System with up to 14 camera views, enhancing visibility and control during towing operations. The AT4 and AT4X models include an electronic locking rear differential for improved traction in challenging conditions. The AT4X adds Terrain Mode with rocker protection cameras for enhanced off-road capability. Higher trim levels benefit from the ProGrade Trailering System and in-vehicle trailering app, providing comprehensive monitoring and control of trailer functions.

SLE and higher trims feature a 13.4-inch diagonal touchscreen infotainment system and a 12.3-inch diagonal digital instrument cluster. The Denali and Denali Ultimate elevate luxury with full-grain leather seating and unique stitching patterns. The Denali Ultimate adds 16-way power adjustable front seats with massage function. Both Denali models incorporate a 15-inch diagonal multicolor Head-Up Display and premium Bose audio system with 12 speakers. All trims include wireless Apple CarPlay and Android Auto compatibility. SLE and above receive dual-zone automatic climate control, while SLT and higher trims add heated and ventilated front seats. The Rear Camera Mirror enhances visibility in higher trim levels.

Every Sierra 2500 HD comes standard with Forward Collision Alert, Automatic Emergency Braking, Following Distance Indicator, Front Pedestrian Braking, and IntelliBeam automatic high beam assist. SLE and higher trims add Lane Departure Warning and Lane Keep Assist. SLT and above include Adaptive Cruise Control and HD Surround Vision with up to 14 camera views. The Rear Cross Traffic Alert with Trailer Coverage provides additional security when backing up with a trailer. The Buckle to Drive feature promotes safe driving habits across all trim levels.