2023 GMC Sierra 2500HD AT4

2023 GMC Sierra 2500HD AT4 — Summit White
Duramax 6.6L diesel Turbo V8 | 445 hp | 910 lb-ft — Excellent overall condition

Ready for work, weekend adventures, or both, this 2023 Sierra 2500HD AT4 pairs massive Duramax diesel torque with AT4’s off-road-focused hardware and premium creature comforts. Finished in Summit White, this truck looks sharp on the road and stands up to tough jobs off it. The interior is in excellent condition — please ask if you’d like the exact trim/color details for this specific unit.

What you’ll appreciate (factory features and built-in capability)
- Potent diesel powertrain: The factory-installed Duramax 6.6L turbo V8 delivers 445 horsepower and a staggering 910 lb-ft of torque, matched to a heavy-duty Allison automatic transmission for strong, smooth acceleration, confident passing, and class-leading towing performance.
- Heavy-duty 4x4 hardware: Four-wheel drive, a robust transfer case and heavy-duty driveline components give you traction and durability when you need it most. AT4 models include off-road–tuned suspension and underbody protection to handle rough trails and jobsite conditions.
- AT4 off-road package: Factory AT4 upgrades include an elevated suspension setup and off-road tuned shocks, skid plates for critical components, AT4-specific exterior styling cues (distinct grille and badging), and recovery/tow hooks — all designed for enhanced capability and confidence off pavement.
- Tow and haul functionality: Built for towing from the factory — heavy-duty cooling systems, integrated trailer wiring, trailer sway control and an integrated trailer brake controller combine to make hooking up and towing safer and easier. Factory hitch receiver and reinforced rear frame components maximize towing and payload capability.
- Bed and cargo convenience: Sierra HD trucks come with a practical pickup bed engineered for work, including tie-downs and durable surfaces. Many Sierra HDs are equipped from the factory with the versatile MultiPro tailgate and bed step options to simplify loading and accessing cargo — a real help on busy days.
- Wheels & tires: Rugged AT4 wheels wrapped in all-terrain tires provide a blend of off-road traction and on-road composure. The wheels and tires are factory-matched to the AT4 suspension for optimized ride and capability.
- Comfort & convenience: Factory features include power-adjustable driver and front passenger seats, automatic climate control, remote keyless entry, cruise control and a center console with useful storage and charging points. The cabin is built to be comfortable for long hauls while durable enough for daily work.
- Infotainment & connectivity: GMC’s factory infotainment system (standard touchscreen) offers smartphone integration with Apple CarPlay and Android Auto, Bluetooth hands-free calling and audio streaming, and available upgrades such as navigation or a larger display depending on the build. In-vehicle Wi-Fi and multiple USB ports make staying connected simple.
- Driver-assist & safety tech: The Sierra HD line is equipped with a suite of standard and available safety features — rearview camera, parking sensors and a variety of driver-assist technologies (forward collision alert, lane departure alerts and more) that enhance everyday safety and maneuvering when towing.
- Practical touches: Factory-installed tow hooks, heavy-duty brakes, illuminated cargo bed lighting (on many builds), and thoughtfully placed storage compartments make this truck easy to live with and work from every day.

Condition highlights
- Exterior: Summit White paint in excellent overall condition — glossy finish, straight panels, and well-maintained trim and exterior accents.
- Interior: The cabin is clean and well-kept. Seats, controls and surfaces are in excellent condition. If you want a close-up walk-through or photos of the specific interior color and trim, we’ll get them for you.

If you’re after a truck that combines diesel torque, genuine off-ro