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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⢠CLEAN CARFAX - ONE OWNER
⢠FULLY SERVICED
⢠NON SMOKER VEHICLE
⢠WARRANTY INCLUDED
⢠HEATED SEATS
⢠Free First Oil Change
⢠5 Day Return / 30 Day Exchange
⢠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 2500HD AT4
- Exterior Color
- Onyx Black
- Interior Color
- Jet Black
- Odometer
- 88,367 miles
- Transmission
- 10-Speed Automatic
- Drivetrain
- 4x4
- Engine
- 6.6L V8 32V DDI OHV Turbo Diesel
- VIN
- 1GT49PEY0MF248010
- Stock Number
- HU600321
GMC
Sierra 2500HD
Included Packages & Accessories
- 6 Speakers
- AM/FM radio: SiriusXM with 360L
- Premium audio system: Premium GMC Infotainment System
- Air Conditioning
- Automatic temperature control
- Front dual zone A/C
- Rear window defroster
- Driver Memory
- Memory seat
- Power driver seat
- Power steering
- Remote keyless entry
- Steering wheel mounted audio controls
- Speed-sensing steering
- Traction control
- 4-Wheel Disc Brakes
- ABS brakes
- Dual front impact airbags
- Dual front side impact airbags
- Front anti-roll bar
- Front wheel independent suspension
- Low tire pressure warning
- Occupant sensing airbag
- Overhead airbag
- Pickup Box
- Brake assist
- Electronic Stability Control
- Lane Departure Warning System
- Delay-off headlights
- Front fog lights
- Fully automatic headlights
- Panic alarm
- Security system
- Speed control
- Dual 220-Amps Primary/170-Amps Aux Alternators
- Engine Block Heater
- Exhaust Brake
- Heavy-Duty 80 Amp Battery
- AT4 High Clearance Step (LPO)
- Auto-dimming door mirrors
- Bumpers: body-color
- Front License Plate Kit
- Heated door mirrors
- AT4 Preferred Package
- AT4 Premium Plus Package
- Driver Alert Package I
- Driver Alert Package II
- Gooseneck/5th Wheel Package
- Gooseneck/5th Wheel Prep Package
- Preferred Equipment Group 4SB
- Snow Plow Prep/Camper Package
- Technology Package
- X31 Off-Road Package
- 6-Speaker Audio System Feature
- Bose Premium 7 Speaker Sound System
- HD Radio
- Radio: AM/FM w/Premium GMC Infotainment System
- Radio: Premium GMC Infotainment Sys w/Navigation
- SiriusXM w/360L
- Steering Wheel Audio Controls
- Electric Rear-Window Defogger
- 12-Volt Rear Auxiliary Power Outlet
- 120-Volt Bed Mounted Power Outlet
- 120-Volt Instrument Panel Power Outlet
- Power Windows w/Driver Express Up/Down
- Remote Vehicle Starter System
- Universal Home Remote
- Manual Tilt-Wheel/Telescoping Steering Column
- Off-Road Suspension
- Electrical Lock Control Steering Column
- Keyless Open & Start
- Power Door Locks
- Power Sunroof
- Hill Descent Control
- Unauthorized Entry Theft-Deterrent System
- 2-Speed Active Transfer Case
- 220 Amps Alternator
- IntelliBeam Automatic High Beam On/Off
Included Packages & Options
- AT4 Premium Plus Package
- AT4 Preferred Package
- Driver Alert Package I
- Driver Alert Package II
- Power Sunroof
- Technology Package
- AT4 Preferred Package
- Universal Home Remote
- Radio: Premium GMC Infotainment Sys w/Navigation
- Bose Premium 7 Speaker Sound System
- Technology Package
- Driver Alert Package I
- Gooseneck/5th Wheel Package
- Gooseneck/5th Wheel Prep Package
- Driver Alert Package II
- IntelliBeam Automatic High Beam On/Off
- Snow Plow Prep/Camper Package
- 220 Amps Alternator
- Radio: AM/FM w/Premium GMC Infotainment System
- 6-Speaker Audio System Feature
- SiriusXM w/360L
- HD Radio
- Preferred Equipment Group 4SB
- Radio: AM/FM w/Premium GMC Infotainment System
- Electric Rear-Window Defogger
- Power Door Locks
- Remote Vehicle Starter System
- Keyless Open & Start
- 12-Volt Rear Auxiliary Power Outlet
- 120-Volt Instrument Panel Power Outlet
- 120-Volt Bed Mounted Power Outlet
- Steering Wheel Audio Controls
- Manual Tilt-Wheel/Telescoping Steering Column
- Electrical Lock Control Steering Column
- Unauthorized Entry Theft-Deterrent System
- Power Windows w/Driver Express Up/Down
- X31 Off-Road Package
- 2-Speed Active Transfer Case
- X31 Off-Road Package
- Off-Road Suspension
- Hill Descent Control
Included Options
- 6 Speakers
- AM/FM radio: SiriusXM with 360L
- Premium audio system: Premium GMC Infotainment System
- Air Conditioning
- Automatic temperature control
- Front dual zone A/C
- Rear window defroster
- Driver Memory
- Memory seat
- Power driver seat
- Power steering
- Remote keyless entry
- Steering wheel mounted audio controls
- Speed-sensing steering
- Traction control
- 4-Wheel Disc Brakes
- ABS brakes
- Dual front impact airbags
- Dual front side impact airbags
- Front anti-roll bar
- Front wheel independent suspension
- Low tire pressure warning
- Occupant sensing airbag
- Overhead airbag
- Pickup Box
- Brake assist
- Electronic Stability Control
- Lane Departure Warning System
- Delay-off headlights
- Front fog lights
- Fully automatic headlights
- Panic alarm
- Security system
- Speed control
- Dual 220-Amps Primary/170-Amps Aux Alternators
- Engine Block Heater
- Exhaust Brake
- Heavy-Duty 80 Amp Battery
- AT4 High Clearance Step (LPO)
- Auto-dimming door mirrors
- Bumpers: body-color
- Front License Plate Kit
- Heated door mirrors
Detailed Specifications
- 1st and 2nd row curtain head airbags
- 4-wheel ABS Brakes
- ABS and Driveline Traction Control
- Aluminum dash trim
- Aluminum/sim carbon fibre center console trim
- Aluminum/sim carbon fibre door trim
- Anti-theft alarm system
- Audio System Premium Brand : Premium GMC Infotainment System
- Audio controls on steering wheel
- Audio system memory card slot
- Automatic front air conditioning
- Auxilliary engine cooler
- Auxilliary transmission cooler
- Bluetooth wireless phone connectivity
- Braking Assist
- Bucket front seats
- Climate Controlled : Driver and passenger heated
- Compass
- Cruise control
- Cruise controls on steering wheel
- Daytime running lights
- Digital Audio Input
- Driver seat memory
- Dual front air conditioning zones
- Dual illuminated vanity mirrors
- Electrochromatic auto-dimming mirrors
- Electrochromatic rearview mirror
- External temperature display
- Fold-up cushion rear seats
- Front Ventilated disc brakes
- Front and rear reading lights
- Front fog/driving lights
- Heated driver mirror
- Heated passenger mirror
- Heated steering wheel
- Leather seat upholstery
- Leather/aluminum steering wheel trim
- Machined aluminum rims w/ painted accents
- Memorized Settings for 2 drivers
- Memorized Settings including door mirror(s)
- Passenger Airbag
- Power extendable trailer style exterior mirrors
- Power remote driver mirror adjustment
- Power remote passenger mirror adjustment
- Power retractable mirrors
- Power windows
- Privacy glass: Deep
- Rear seats center armrest
- Remote Engine Start : Keyfob remote start
- Remote power door locks
- Remote window operation
- Side airbag
- SiriusXM with 360L AM/FM/HD/Satellite
- SiriusXM with 360L Satellite Radio
- Speed-proportional power steering
- Split rear bench
- Stability controll with anti-roll
- Suspension class: Off-road
- Tachometer
- Tilt and telescopic steering wheel
- Tire Pressure Monitoring System: Tire specific
- Total Number of Speakers: 6
- Trailer hitch
- Trip computer
- Turn signal in mirrors
- Urethane shift knob trim
- Video Monitor Location: Front
- Wheel Diameter: 18
- Wheel Width: 8
Standard Features
- AT4 Preferred Package
- Driver Alert Package I
- Driver Alert Package II
- Power Sunroof
- Technology Package
- Universal Home Remote
- Radio: Premium GMC Infotainment Sys w/Navigation
- Bose Premium 7 Speaker Sound System
- Gooseneck/5th Wheel Prep Package
- IntelliBeam Automatic High Beam On/Off
- 220 Amps Alternator
- 6-Speaker Audio System Feature
- SiriusXM w/360L
- HD Radio
- Radio: AM/FM w/Premium GMC Infotainment System
- Electric Rear-Window Defogger
- Power Door Locks
- Remote Vehicle Starter System
- Keyless Open & Start
- 12-Volt Rear Auxiliary Power Outlet
- 120-Volt Instrument Panel Power Outlet
- 120-Volt Bed Mounted Power Outlet
- Steering Wheel Audio Controls
- Manual Tilt-Wheel/Telescoping Steering Column
- Electrical Lock Control Steering Column
- Unauthorized Entry Theft-Deterrent System
- Power Windows w/Driver Express Up/Down
- X31 Off-Road Package
- 2-Speed Active Transfer Case
- Off-Road Suspension
- Hill Descent 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
* Although every reasonable effort has been made to ensure the accuracy of the information contained on this site, absolute accuracy cannot be guaranteed. This site, and all information and materials appearing on it, are presented to the user "as is" without warranty of any kind, either express or implied. All vehicles are subject to prior sale. ‡Vehicles shown at different locations are not currently in our inventory (Not in Stock) but can be made available to you at our location within a reasonable date from the time of your request, not to exceed one week. Residency restrictions may apply.
- Market
Value Price - $49,999
- Fred Beans
Discount &
Rebates* - -$1,080
- Fred Beans Price
- $48,919
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