Sierra Heavy Duty’s available Duramax 6.6L Turbo-Diesel V8 engine features an efficient turbocharger and Allison 10-speed automatic transmission.
The 2025 Sierra Heavy Duty offers more trailering-assistance technologies than any competitor in its class, so you can trailer with confidence.
Stand out everywhere you go with GMC Sierra HD Denali’s iconic chrome grille, front bumper and fascia.
The powerfully innovative available MultiPro Tailgate combines six convenient functions to help make light work of almost any job in your work truck.
LED projector headlamps with striking animated sequences help enhance Sierra Heavy Duty’s impressive exterior design.
Sierra HD Denali Ultimate’s Alpine Umber interior features full-grain leather seating, plaited contrast stitching, and embossed and laser-etched topographical map patterns of Mt. Denali’s summit.
Experience serious comfort in Sierra Heavy Duty’s available best-in-class* 16-way power front seats with massaging feature.
The Sierra Heavy Duty truck features best-in-class Crew Cab front head and leg room.*
The available 15" diagonal Head-Up Display helps keep important information like speed and alerts in clear view.
Standard on every new GMC - GMC Pro Grade Protection has you truly protected with features and services including:
Forward Collision Alert can warn you if it detects a potential front-end collision with a vehicle you’re following so you can quickly take action. It can also provide a tailgating alert if you’re following a vehicle much too closely.
Front and Rear Park Assist* can provide distance alerts to nearby detected objects in front of or behind your vehicle to help you park and avoid collisions at low speeds.
Lane Change Alert with Side Blind Zone Alert can provide side-mirror visual alerts when a detected moving vehicle is quickly approaching or is in your side blind zone. It can help you avoid lane change collisions.