Discover the ultimate in power, capability, and style with the 2021 GMC Sierra 2500HD AT4. This exceptional truck is the perfect blend of rugged performance and refined luxury, making it the ideal choice for those who demand the very best.
Highlights of this impressive vehicle include:
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â?¢ CLEAN CARFAX - ONE OWNER
â?¢ FULLY SERVICED
â?¢ NON SMOKER VEHICLE
â?¢ WARRANTY INCLUDED
â?¢ HEATED SEATS
â?¢ Free First Oil Change
â?¢ 5 Day Return / 30 Day Exchange
â?¢ Auto Reward Program
Under the hood, this Sierra 2500HD AT4 is powered by the renowned Duramax 6.6L V8 Turbodiesel engine, delivering an incredible 445 horsepower and an astonishing 910 lb-ft of torque. Paired with a smooth-shifting 10-speed automatic transmission and a robust 4WD system, this truck is ready to tackle any terrain with confidence.
The AT4 Premium Plus Package takes this Sierra to the next level, adding features like a power sunroof, 20-inch machined aluminum wheels, and the advanced Technology Package. The Gooseneck/5th Wheel Package further enhances the truck's towing capabilities, making it the ultimate workhorse.
This one-owner Sierra 2500HD AT4 has been meticulously maintained and is backed by a comprehensive warranty, giving you peace of mind on the road. With its sleek Onyx Black exterior and premium Black interior, this truck exudes a bold, sophisticated presence that is sure to turn heads wherever you go.
Experience the unparalleled power and refinement of the 2021 GMC Sierra 2500HD AT4. Call us today at 908-835-8100 to schedule a test drive and see why this exceptional truck is the perfect choice for your next adventure.
Used 2021 GMCSierra 2500 HD AT4
- Exterior Color
- Onyx Black
- Interior Color
- Jet Black
- Odometer
- 88,367 miles
- Body/Seating
- Truck Crew Cab/5 seats
- Transmission
- 10-Speed Automatic
- Drivetrain
- 4x4
- Engine
- V-8 cyl
- VIN
- 1GT49PEY0MF248010
- Stock Number
- HU600321
GMC
Sierra 2500 HD
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
- Preferred Equipment Group 4SB
- 18" Machined Aluminum Wheels
- 20" Machined Aluminum Wheels
- Perforated Leather-Appointed Front Seat Trim
- 10-Way Power Driver Seat Adjuster w/Lumbar
- AT4 Preferred Package
- AT4 Premium Plus Package
- Driver Alert Package I
- Driver Alert Package II
- Technology Package
- Radio: AM/FM w/Premium GMC Infotainment System
- Radio: Premium GMC Infotainment Sys w/Navigation
- Electric Rear-Window Defogger
- Front Prem Floor Liners w/Removable Carpet Insert
- OnStar & GMC Connected Services Capable
- 120-Volt Instrument Panel Power Outlet
- Bed View Camera w/2 Trailer Camera Provisions
- Power Sunroof
- Spray-On Pickup Box Bed Liner w/AT4 Logo
- Power-Retractable Black Assist Steps
- Deep-Tinted Glass
- Front License Plate Kit
- LED Smoked Amber Roof Marker Lamps
- LED Cargo Area Lighting
- Pickup Box
- AT4 High Clearance Step (LPO)
- Snow Plow Prep/Camper Package
- Integrated Trailer Brake Controller
- Gooseneck/5th Wheel Package
- Gooseneck/5th Wheel Prep Package
- 220 Amps Alternator
- Dual 220-Amps Primary/170-Amps Aux Alternators
- Engine Block Heater
- Skid Plates
- Off-Road Suspension
- 2-Speed Active Transfer Case
- Inside Rearview Auto-Dimming Rear Camera Mirror
- SiriusXM w/360L
- Driver Memory
- Power Sliding Rear Window w/Defogger
- 10-Way Power Passenger Seat Adjuster w/Lumbar
- GMC Connected Access Capable
- Power Front Passenger Windows w/Express Up/Down
- Power Rear Windows w/Express Down
- Keyless Open & Start
- Power Door Locks
- Power Windows w/Driver Express Up/Down
- Rear Wheelhouse Liners
- Winter Grille Cover
- Rear Prem Floor Liners w/Removable Carpet Insert
- Remote Vehicle Starter System
- Compass Located In Instrument Cluster
- Floor-Mounted Center Console
- Painted Black Surround Grille
- Safety Alert Seat
- Hill Descent Control
- Exhaust Brake
- Wireless Charging
- Heated Driver & Front Outboard Passenger Seats
- Heated 2nd Row Outboard Seats
- 120-Volt Bed Mounted Power Outlet
- 12-Volt Rear Auxiliary Power Outlet
- Heated & Ventilated Front Bucket Seats
- Heavy-Duty 80 Amp Battery
- 2 USB Ports
- 2 USB Ports (1st Row)
- Electrical Lock Control Steering Column
- Manual Tilt-Wheel/Telescoping Steering Column
- ProGrade Trailering System
- Hitch Guidance w/Hitch View
- IntelliBeam Automatic High Beam On/Off
- In-Vehicle Trailering System App
- HD Radio
- Ultrasonic Front & Rear Park Assist
- 4.2" Diagonal Color Display Driver Info Center
- Following Distance Indicator
- Forward Collision Alert
- Rear Cross Traffic Alert
- Lane Departure Warning System
- Universal Home Remote
- 8" Multicolor Driver Information Center
- Automatic Emergency Braking
- Steering Wheel Audio Controls
- Lane Change Alert w/Side Blind Zone Alert
- Bose Premium 7 Speaker Sound System
- 6-Speaker Audio System Feature
- 2nd Row Dual USB Charge-Only Ports
- Unauthorized Entry Theft-Deterrent System
- Multicolor 15" Diagonal Head-Up Display
- HD Rear Vision Camera
- HD Surround Vision
- 4G LTE Wi-Fi Hotspot Capable
- Wireless Phone Projection
- X31 Off-Road Package
- 4-Wheel Disc Brakes
- Apple CarPlay/Android Auto
- Premium audio system: Premium GMC Infotainment System
- AM/FM radio: SiriusXM with 360L
- Compass
- Auto-dimming Rear-View mirror
- Ventilated front seats
- Variably intermittent wipers
- Turn signal indicator mirrors
- Trip computer
- Traction control
- Tilt steering wheel
- Telescoping steering wheel
- Steering wheel mounted audio controls
- Split folding rear seat
- Speed-sensing steering
- Speed control
- Security system
- Remote keyless entry
- Rear window defroster
- Rear step bumper
- Rear seat center armrest
- Rear reading lights
- Power windows
- Power steering
- Power passenger seat
- Power driver seat
- Power door mirrors
- Passenger vanity mirror
- Passenger door bin
- Panic alarm
- Overhead console
- Overhead airbag
- Outside temperature display
- Occupant sensing airbag
- Memory seat
- Low tire pressure warning
- Illuminated entry
- Heated steering wheel
- Heated rear seats
- Heated front seats
- Heated door mirrors
- Fully automatic headlights
- Front wheel independent suspension
- Front reading lights
- Front fog lights
- Front dual zone A/C
- Front anti-roll bar
- Dual front side impact airbags
- Dual front impact airbags
- Driver vanity mirror
- Driver door bin
- Delay-off headlights
- Bumpers: body-color
- Brake assist
- Automatic temperature control
- Auto-dimming door mirrors
- Alloy wheels
- ABS brakes
- Voltmeter
- Tachometer
- Front Center Armrest
- Front Bucket Seats
- Electronic Stability Control
- Air Conditioning
- 6 Speakers
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 wheel independent suspension
- Power steering
- Single rear wheels
- Speed-sensing steering
- Tires: all-terrain
- 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
- Cylinder configuration: V-8
- Drive type: four-wheel
- Engine liters: 6.6L
- Engine location: front
- Fuel tank capacity: 36.0gal.
- Hybrid traction battery type: none
- Manual-shift auto
- Mode select transmission
- Rear locking differential
- Standard fuel economy fuel type: gasoline
- 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
- 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")
- 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

Overall3.8Out 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 13 consumer ratings for 2020–2025 models. | Privacy
- Fred Beans Price
- $48,919
- We're here to help: 908-835-8100
- We're here to help: 908-835-8100




