Discover the ultimate in power, capability, and off-road prowess with the 2021 GMC Sierra 2500HD AT4. This rugged and versatile truck is built to conquer any terrain, delivering exceptional performance and uncompromising strength.
Boasting an impressive array of features, the Sierra 2500HD AT4 is equipped to handle even the most demanding tasks. Key highlights include:
- **GREAT SERVICE HISTORY**
- **APPLE CARPLAY / ANDROID AUTO**
- **HEATED LEATHER SEATS**
- **BACK-UP CAMERA**
- AT4 off-road capability
- Heavy-duty strength and confidence
- Strong and dependable
Under the hood, the Sierra 2500HD AT4 is powered by a Duramax 6.6L V8 Turbodiesel engine, mated to a 10-speed automatic transmission and a robust 4WD system. This powertrain delivers exceptional performance, with 445 horsepower and an impressive 910 lb-ft of torque, ensuring you have the muscle to conquer any challenge.
Designed with the adventurer in mind, the Sierra 2500HD AT4 is packed with a wealth of off-road-focused features. The AT4 Preferred Package, Driver Alert Package I, Gooseneck/5th Wheel Package, and X31 Off-Road Package provide the tools you need to tackle the toughest terrain with confidence.
This Sierra 2500HD AT4 has been meticulously maintained and is now available for purchase. With its comprehensive warranty coverage and impressive service history, you can trust that this truck has been well-cared for and is ready to take on your toughest jobs.
Experience the unparalleled capability and rugged charm of the 2021 GMC Sierra 2500HD AT4. Schedule a test drive today and discover the power and versatility that this exceptional truck has to offer.
Used 2021 GMCSierra 2500 HD AT4
- Diesel
- Exterior Color
- Pacific Blue Metallic
- Interior Color
- 4SB--Leather, Jet Black / Kalahari, Interior Trim
- Odometer
- 105,990 miles
- Transmission
- Automatic
- Drivetrain
- 4WD
- Engine
- 6.6L V8 DuraMax Diesel, Turbo
- VIN
- 1GT49PEY3MF111837
- Stock Number
- MG600771
GMC
Sierra 2500 HD
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

Overall3.7Out of 5
- 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!…
Based on 15 consumer ratings for 2020–2026 models. | Privacy
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Value Price - $48,436
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