This 2020 GMC Sierra 2500HD AT4 delivers the capability and refinement you expect from a premium heavy-duty truck, combining rugged performance with thoughtful comfort features for those who demand both work and lifestyle versatility.
- Duramax 6.6L V8 Turbodiesel with 445 hp and 910 lb-ft of torque
- Power sunroof
- Technology Package with HD Surround Vision, Rear Camera Mirror, and Bed View Camera
- Multicolor 15" Head-Up Display
- AT4 Premium Package with 20" machined aluminum wheels and 6" Black assist steps
- Driver Alert Package II with Forward Collision Alert, Lane Departure Warning, and Automatic Emergency Braking
- Heated and ventilated front bucket seats with leather trim
- Integrated Trailer Brake Controller and 5th Wheel/Gooseneck Trailer Wiring
- Premium GMC Infotainment System with Navigation and Apple CarPlay/Android Auto
- Bose Premium 7-Speaker Sound System with SiriusXM
- IntelliBeam automatic high-beam headlamps with fog lights
- Wireless charging and dual-zone automatic climate control
- 10-Way power driver and passenger seats with lumbar support
- Remote Vehicle Starter System and keyless open and start
- Engine Block Heater for reliable cold-weather starts
The Duramax diesel engine provides the torque and efficiency required for serious towing and hauling, while the 10-speed automatic transmission ensures smooth power delivery across all driving conditions. The 4WD system with 2-speed active transfer case and off-road suspension gives you confidence on any terrain, backed by hill descent control for technical descents.
Inside, the cabin reflects the AT4's premium positioning. Heated and ventilated leather-appointed front seats keep you comfortable year-round, and the 15-inch head-up display projects critical information directly into your line of sight. The premium infotainment system integrates seamlessly with your smartphone, while the Bose audio system delivers quality sound for every drive. Climate control operates independently for driver and passenger, and the power sunroof opens up the cabin on pleasant days.
Safety and awareness technology are comprehensive. Forward collision alert, automatic emergency braking, and lane departure warning work together to help prevent accidents. The HD surround vision system with trailer view cameras and rear camera mirror provides crucial visibility when maneuvering in tight spaces or reversing with a trailer. The following distance indicator helps maintain safe spacing on the highway.
Trailering capability is built in from the factory. The integrated trailer brake controller, hitch guidance with hitch view, and in-vehicle trailering system app take the guesswork out of towing. The 5th wheel and gooseneck trailer wiring provisions are already installed, ready for your equipment when you need it.
This Sierra 2500HD AT4 carries 57,665 miles and presents as a well-maintained example of GMC's heavy-duty truck engineering. The black exterior with machined wheels and black accents conveys purposeful styling, while the comprehensive feature set ensures you're equipped for whatever comes nextâ"whether that's a weekend at the cabin or a full workday on the jobsite.
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