Key Features of the 2025 GMC Sierra 2500 HD

Duramax® 6.6L Turbo-Diesel V8 Powertrain

For those who demand the most from their heavy-duty pickup, the available Duramax® 6.6L Turbo-Diesel V8, paired with a 10-speed Allison® automatic transmission, is a true benchmark in the segment. This engine is engineered for maximum torque and dependable performance, not only powering through tough jobs but also delivering exceptional efficiency under load. Towing up to 21,870 lbs with gooseneck/fifth-wheel trailering and up to 20,000 lbs conventional, the 2025 Sierra 2500 HD is ready for the big jobs near San Marcos, TX. The robust drivetrain, advanced cooling, and integrated trailering systems make it the vehicle of choice for those who need proven reliability combined with new-generation technology.

GMC MultiPro™ Tailgate

Innovation meets convenience with the available world’s-first MultiPro™ Tailgate, offering six distinct functions to improve loading, unloading, and accessing the Sierra HD’s cargo bed. Whether you’re at the work site or loading recreational gear, the MultiPro™ Tailgate transforms the truck bed’s utility and accessibility. Features such as a standing workstation, full-width step, and load stop mean you can configure the tailgate for virtually any cargo scenario. When paired with available audio system integration, your tailgate area is ready for both work and play—setting a new standard for what to expect from a heavy-duty pickup in the Round Rock area and beyond.

Advanced Trailering Technology

The 2025 Sierra 2500 HD excels in empowering drivers with next-generation trailering tools. An In-Vehicle Trailering App, available on SLE-trim and above, allows you to create custom trailer profiles, track tire pressures, and monitor trailer electrical diagnostics directly from the center touchscreen. With up to 13 available camera views, including bed view, HD Surround Vision, and the class-exclusive transparent trailer view, the Sierra elevates confidence whether you’re backing into tight spaces or monitoring cargo in motion. These thoughtful innovations allow drivers near San Marcos, TX to tow with greater ease and reduced stress, perfect for both professional and recreational needs.

Best-in-Class Interior Comfort and Space

Step inside the Sierra 2500 HD and you’ll experience a cabin designed for both productivity and relaxation. The Crew Cab delivers best-in-class front headroom and legroom, plus generous rear legroom to keep all passengers comfortable—whether you’re in Round Rock traffic or cruising toward Killeen or Temple. Standard amenities include wireless Apple CarPlay® and Android Auto™, with available upgrades such as a GMC Premium Infotainment System featuring built-in Google services, a 12.3" digital Driver Information Center, and 10-way power seating with lumbar support. Rear-seat comfort is a highlight, and models like the SLT, Denali, and Denali Ultimate add luxuries such as authentic open-pore wood, ventilated seats, and a premium Bose® sound system.

Comprehensive Safety and Driver Assistance

GMC’s Sierra HD Pro Safety package is standard across the 2025 Sierra HD line-up, offering a suite of advanced active safety technologies to protect you and your loved ones. Features include Forward Collision Alert, Following Distance Indicator, Front Pedestrian Braking, Lane Departure Warning, Automatic Emergency Braking, IntelliBeam automatic high beams, and more. Adaptive Cruise Control with trailering functionality is also available, allowing the system to take into account trailer drag and braking distance. Combined with the high-visibility lighting, durable build, and multiple camera views, these systems are engineered to help make every drive safer—whether you’re hauling through rural Texas or navigating city streets.