Discover the ultimate heavy-duty pickup that combines rugged capability with refined comfort - the 2021 GMC Sierra 2500HD AT4. This exceptional truck is a true force to be reckoned with, engineered to tackle any challenge with unwavering confidence.
- APPLE CARPLAY!! ANDROID AUTO!!*** - Local Trade
- 6.6L V8 Diesel Turbocharged (Duramax) (B20-Diesel Compatible) (445 hp @ 2800 rpm, 910 lb-ft @ 1600 rpm) (Includes (K05) Engine Block Heater)
- LPO, SPORT STEP, BLACK (dealer-installed)
- WHEELS, 20" (50.8 CM) MACHINED ALUMINUM with high gloss Black accents
- Onyx Black
Beneath the muscular exterior lies a heart of pure power, courtesy of the Duramax 6.6L V8 Turbodiesel engine. This powerplant delivers an impressive 445 horsepower and an astounding 910 lb-ft of torque, ensuring you can conquer any task with ease. Paired with the smooth-shifting 10-speed automatic transmission and robust 4WD system, the Sierra 2500HD AT4 is primed for adventure, whether you're towing a heavy trailer or navigating rugged terrain.
The Sierra 2500HD AT4 is more than just a workhorse; it's a premium-appointed truck that caters to your every need. Indulge in the comfort of heated and ventilated front seats, while your passengers in the rear enjoy the warmth of heated outboard seats. Stay connected with the intuitive Premium GMC Infotainment System, featuring seamless integration with Apple CarPlay and Android Auto.
Elevate your off-road prowess with the X31 Off-Road Package, which includes features like Hill Descent Control, Skid Plates, and an Off-Road Suspension. The Snow Plow Prep/Camper Package further enhances the Sierra's versatility, ensuring you're ready for any adventure, whether it's conquering snow-covered roads or embarking on a camping excursion.
Safety is paramount, and the Sierra 2500HD AT4 delivers with a comprehensive suite of advanced driver assistance technologies. From the Rear Vision Camera to the Integrated Trailer Brake Controller, this truck is designed to keep you and your cargo secure, no matter the conditions.
Experience the unparalleled capability and refined luxury of the 2021 GMC Sierra 2500HD AT4. Visit our showroom today and discover how this exceptional truck can transform the way you work and play.
Used 2021 GMCSierra 2500HD AT4 4WD Crew Cab 159 AT4
- Diesel
- Exterior Color
- Onyx Black
- Interior Color
- Jet Black With Kalahari Accents
- Odometer
- 42,371 miles
- Body/Seating
- 4WD Crew Cab 159 AT4/5 seats
- Transmission
- Automatic
- Engine
- 8
- VIN
- 1GT49PEY4MF307205
- Stock Number
- MF307205
GMC
Sierra 2500HD
Highlighted Features
- Leather upholstery
- Automatic temperature control
- Premium audio system
- Wireless phone connectivity
- Front dual zone A/C
- Auto-dimming rearview mirror
- Split folding rear seat
- Memory seat
- Heated front seats
- Ventilated front seats
- Perimeter/approach lights
- Remote keyless entry
Included Packages & Accessories
Detailed Specifications
- 1-touch down
- 1-touch up
- Air conditioning
- Auto-dimming rearview mirror
- Automatic temperature control
- Driver door bin
- Driver vanity mirror
- Front beverage holders
- Front dual zone A/C
- Heated steering wheel
- Illuminated entry
- Memory seat
- Overhead console
- Passenger door bin
- Passenger vanity mirror
- Power windows
- Proximity key: doors and push button start
- Rear beverage holders
- Rear door bins
- Remote engine start: keyfob
- Remote keyless entry
- Speed control
- Telescoping steering wheel
- Tilt steering wheel
- Alloy wheels
- Front anti-roll bar
- Front tires: 275/65SR20.0
- Front wheel independent suspension
- Power steering
- Rear tires: 275/65SR20.0
- Single rear wheels
- Speed-sensing steering
- Tires: all-terrain
- Wheel size: 20"
- 1st row LCD monitors: 2
- AM/FM radio: SiriusXM with 360L
- Premium audio system: Premium GMC Infotainment System
- Primary LCD size: 8.0"
- Smart device integration: Android Auto/Apple CarPlay
- Steering wheel mounted audio controls
- Wireless phone connectivity: Bluetooth
- Front center armrest
- Front seats: bucket
- Heated front seats
- Heated rear seats
- Leather upholstery
- Max seating capacity: 5
- Power 2-way driver lumbar support
- Power 2-way passenger lumbar support
- Power driver seat
- Power passenger seat
- Rear seat center armrest
- Rear seats: split-bench
- Rear seats Folding position: fold-up cushion
- Seat Upholstery: leather
- Split folding rear seat
- Ventilated front seats
- Block heater
- Compressor: intercooled turbo
- Cylinder configuration: V-8
- Drive type: four-wheel
- Engine liters: 6.6L
- Engine location: front
- Fuel tank capacity: 36.0gal.
- Horsepower: 445hp @ 2,800RPM
- Hybrid traction battery type: none
- Manual-shift auto
- Mode select transmission
- Number of valves: 32
- Rear locking differential
- Recommended fuel: Diesel
- Standard fuel economy fuel type: gasoline
- Torque: 910 lb.-ft. @ 1,600RPM
- Transmission: 10 speed automatic
- Variable valve control
- Ground clearance (min): 257mm (10.1")
- Auto-dimming door mirrors
- Bedliner
- Bumpers: body-color
- Heated door mirrors
- Left rear passenger door: conventional
- Power door mirrors
- Rear cargo: tailgate
- Rear step bumper
- Right rear passenger: conventional
- Skid plates
- Trailer hitch receiver
- Trailer sway control
- Turn signal indicator mirrors
- Compression ratio: 16.00 to 1
- Curb weight: 3,515kg (7,749lbs)
- Engine bore x stroke: 103.0mm x 99.0mm (4.06" x 3.90")
- Engine displacement: 6.6 L
- Engine horsepower: 445hp @ 2,800RPM
- Engine torque: 910 lb.-ft. @ 1,600RPM
- Exterior body width: 2,079mm (81.8")
- Exterior height: 2,023mm (79.7")
- Exterior length: 6,352mm (250.1")
- Front headroom: 1,093mm (43.0")
- Front hiproom: 1,554mm (61.2")
- Front legroom: 1,131mm (44.5")
- Front shoulder room: 1,677mm (66.0")
- Payload: 1,616kg (3,563lbs)
- Rear headroom: 1,013mm (39.9")
- Rear hiproom: 1,530mm (60.2")
- Rear legroom: 1,102mm (43.4")
- Rear shoulder room: 1,659mm (65.3")
- Turning radius: 8.0m (26.3')
- Wheelbase: 4,037mm (158.9")
- Appearance: analog
- Compass
- Delay-off headlights
- Front fog lights
- Front reading lights
- Fully automatic headlights
- Low tire pressure warning
- Oil pressure gauge
- Outside temperature display
- Rear reading lights
- Rear window defroster
- Tachometer
- Trip computer
- Variably intermittent wipers
- Voltmeter
- 4 wheel disc brakes
- ABS brakes
- Brake assist
- Dual front impact airbags
- Dual front side impact airbags
- Electronic stability
- Ignition disable
- Occupant sensing airbag
- Overhead airbag
- Panic alarm
- Perimeter/approach lights
- Security system
- Traction control
Dealer Notes
KBB.com Consumer Reviews

Overall3.9Out 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 14 consumer ratings for 2020–2026 models. | Privacy
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