Discover the ultimate in power, capability, and refined comfort with this 2021 GMC Sierra 2500HD AT4. This exceptional truck is equipped with a robust Duramax 6.6L V8 Turbodiesel engine, delivering an impressive 445 horsepower and 910 lb-ft of torque, seamlessly paired with a 10-speed automatic transmission and 4-wheel drive. Boasting a sleek Onyx Black exterior, this Sierra 2500HD AT4 is more than just a workhorse it's a true expression of rugged style and uncompromising performance.
- Adaptive Cruise Control
- Android Auto & Apple CarPlay
- Blind Spot Alert System
- Bluetooth Hands-Free Calling
- Diesel Engine
- Lane Departure Warning
- Leather Upholstery
- Power Adjustable Driver's and Passenger Seats
- Premium Sound System
- Rear Park Assist
- Spray-In Bedliner
- Tow Package
- Gooseneck/5th Wheel Prep Package
- 220-Amp Alternator
- Engine Block Heater
This Sierra 2500HD AT4 is more than just a capable workhorse it's a true expression of refined utility and uncompromising comfort. With its premium features, advanced technology, and exceptional power, this truck is ready to tackle any job or adventure with ease. Whether you're hauling heavy loads, towing a trailer, or simply enjoying the open road, this Sierra 2500HD AT4 is the perfect companion for the discerning truck enthusiast.
Imagine the confidence you'll feel behind the wheel, with features like Adaptive Cruise Control, Blind Spot Alert, and Lane Departure Warning keeping you safe and secure on the road. The Duramax Diesel engine's impressive torque output and the 10-speed automatic transmission's seamless performance will make light work of even the toughest tasks. And with the Gooseneck/5th Wheel Prep Package, you'll have the flexibility to handle a wide range of towing needs.
Step inside the cabin and you'll be greeted by a premium leather-appointed interior, heated and ventilated front seats, and a state-of-the-art infotainment system with Android Auto and Apple CarPlay. The spacious and well-appointed interior provides a comfortable and refined driving experience, whether you're commuting or embarking on a long-haul adventure.
This 2021 GMC Sierra 2500HD AT4 is a true testament to the brand's commitment to excellence. With its unparalleled capability, advanced features, and refined styling, it's the ultimate choice for the discerning truck buyer. Don't miss your chance to experience the power and luxury of this exceptional vehicle. Schedule a test drive today and discover the difference for yourself.
Used 2021 GMCSierra 2500 HD AT4 Truck Crew Cab Engine: V8 DuraMax Diesel, Turbo
- Diesel
- Exterior Color
- Onyx Black
- Interior Color
- Jet Black
- Odometer
- 64,813 miles
- Transmission
- Automatic
- Drivetrain
- 4x4
- Engine
- Engine: 6.6L V8 DuraMax Diesel, Turbo
- Stock Number
- MF288255
Included Packages & Accessories
Detailed Specifications
- Max seating capacity: 5
- Fuel System: Direct Injection
- Fuel tank capacity: 36 gal
- Horsepower: 445
Dealer Notes
KBB.com Consumer Reviews
- 2.0
Transmission trash
By Jason on Monday, April 07, 2025
Bought a 2023 GMC Duramax diesel Sierra SLT had it for two years hit 50,000 miles. The throttlebody broke went in for service. Got it back three weeks at 62,000 miles now my transmission is slipping. I travel back-and-forth from South Carolina to North Carolina for work daughter’s truck would be my forever truck. What a joke Hundred thousand dollar truck junk - 3.0
Infotainment system unreliable!
By Brian C on Friday, June 27, 2025
The servicing dealer has been great, the GM engineers not so much! The truck will without warning have no sound for the radio and the blinkers. GM told the dealership to reprogram then when that didn't work they said replace the amplifier and when that didn't work, they said replace a module, and when that didn't work they said to replace the amplifier again, and when that didn't work they said we know it's a known problem but we don't know how to fix it. All of this with less than 9k miles. The dealer has done everything that GM has asked them to do, but none of it works. It's very frustrating to pay this much for a truck and you can't get the radio to stay working. It also got away from the factory with paint damage and a dent in the hood,( the dent is from the inside out on a double wall). I thought I was upgrading when I went from a F250 Lariat to a Denali, but I may have traded one headache for another. - 5.0
Fantastic truck
By Jjj on Sunday, November 07, 2021
This one of the most solid vehicles that I have ever driven! The 401 hp engine is more than enough power and the transmission is smooth! Highly recommend this truck!