
Used 2021 GMCSierra 2500 HD Denali
- Exterior Color
- Hunter
- Interior Color
- Jet Black
- Odometer
- 89,124 miles
- Body/Seating
- Truck Crew Cab/5 seats
- Transmission
- Automatic
- Drivetrain
- 4x4
- Engine
- V-8 cyl
- VIN
- 1GT49REY3MF254489
- Stock Number
- KU1873
GMC
Sierra 2500 HD
Highlighted Features
- Navigation system
- Lane departure
- Leather upholstery
- Automatic temperature control
- Power moonroof
- Premium audio system
- Wireless phone connectivity
- Parking sensors
- Exterior parking camera front
- Exterior parking camera left
- Exterior parking camera right
- Exterior parking camera rear
Included Packages & Accessories
- Technology Package
- Inside Rearview Auto-Dimming Rear Camera Mirror
- Multicolor 15" Diagonal Head-Up Display
- Denali Ultimate Package
- Power Sunroof
- Preferred Equipment Group 5SA
- Driver Alert Package I
- Ultrasonic Front & Rear Park Assist
- Lane Change Alert w/Side Blind Zone Alert
- Rear Cross Traffic Alert
- Driver Alert Package II
- Forward Collision Alert
- Lane Departure Warning
- Automatic Emergency Braking
- IntelliBeam Automatic High Beam On/Off
- Following Distance Indicator
- Safety Alert Seat
- Radio: Premium GMC Infotainment Sys w/Navigation
- Bose Premium 7 Speaker Sound System
- SiriusXM w/360L
- HD Radio
- Wireless Phone Projection
- Floor-Mounted Center Console
- Compass Located In Instrument Cluster
- Electric Rear-Window Defogger
- Power Door Locks
- Remote Vehicle Starter System
- Keyless Open & Start
- OnStar & GMC Connected Services Capable
- 4G LTE Wi-Fi Hotspot Capable
- GMC Connected Access Capable
- 12-Volt Rear Auxiliary Power Outlet
- 120-Volt Instrument Panel Power Outlet
- 120-Volt Bed Mounted Power Outlet
- 2 USB Ports
- 2nd Row Dual USB Charge-Only Ports
- Bed View Camera w/2 Trailer Camera Provisions
- HD Surround Vision
- Spray-On Pickup Box Bed Liner w/Denali Logo
- 6" Rectangular Chromed Tubular Assist Steps
- Heated Driver & Front Outboard Passenger Seats
- Heated & Ventilated Front Bucket Seats
- Heated 2nd Row Outboard Seats
- Steering Wheel Audio Controls
- Manual Tilt-Wheel/Telescoping Steering Column
- Electrical Lock Control Steering Column
- Unauthorized Entry Theft-Deterrent System
- Universal Home Remote
- Deep-Tinted Glass
- Signature Denali Grille
- Power Sliding Rear Window w/Defogger
- Power Windows w/Driver Express Up/Down
- Power Front Passenger Windows w/Express Up/Down
- Power Rear Windows w/Express Down
- Wireless Charging
- LED Smoked Amber Roof Marker Lamps
- LED Cargo Area Lighting
- Rear Wheelhouse Liners
- Chrome Recovery Hooks
- Polished Exhaust Tip
- X31 Off-Road Package
- Off-Road Suspension
- Hill Descent Control
- Skid Plates
- Integrated Trailer Brake Controller
- ProGrade Trailering System
- Hitch Guidance w/Hitch View
- In-Vehicle Trailering System App
- Engine: 6.6L V8 w/Direct Injection & VVT
- Heavy-Duty 80 Amp Battery
- GVWR: 10,650 lbs
- 2-Speed Active Transfer Case
- Wheels: 20" High Gloss Black Painted
- Wheels: 20" Transit Aluminum
- Power Retractable Assist Steps
- Front License Plate Kit
- Transmission: Allison 10-Speed Automatic
- Winter Grille Cover
- Engine Block Heater
- Front Bucket Seats
- 10-Way Power Driver Seat Adjuster w/Lumbar
- 10-Way Power Passenger Seat Adjuster w/Lumbar
- Driver Memory
- 3.42 Axle Ratio
- Engine: Duramax 6.6L Turbo-Diesel V8
- Capped Fuel Fill
- 220 Amps Alternator
- Dual Heavy-Duty 70 Amp Battery
- Exhaust Brake
- GVWR: 11,300 lbs
- Pickup Box
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
- Garage door transmitter
- Heated steering wheel
- Illuminated entry
- Memory seat
- Moonroof sunshade: manual
- Navigation system
- Overhead console
- Passenger door bin
- Passenger vanity mirror
- Power moonroof
- 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: 275/65SR20.0E
- Front wheel independent suspension
- Power steering
- Rear tires: 275/65SR20.0E
- 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
- Speaker type: Bose
- Speakers: 7
- Steering wheel mounted audio controls
- Wireless phone connectivity: Bluetooth
- Front center armrest
- Front seats: bucket
- Genuine wood console insert
- Genuine wood door panel insert
- 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
- Door mirrors: chrome
- Heated door mirrors
- Left rear passenger door: conventional
- Power door mirrors
- Rear cargo: tailgate
- Rear step bumper
- Right rear passenger: conventional
- Skid plates
- Tailpipe finisher: polished
- 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")
- Towing capacity: 8,391kg (18,500lbs)
- Turning radius: 8.0m (26.3')
- Wheelbase: 4,037mm (158.9")
- Appearance: analog
- Auto high-beam headlights
- Blind spot: Lane Change Alert with Side Blind Zone Alert warning
- Compass
- Delay-off headlights
- Exterior parking camera cargo
- Exterior parking camera front
- Exterior parking camera left
- Exterior parking camera rear
- Exterior parking camera right
- Front fog lights
- Front reading lights
- Fully automatic headlights
- Heads up display
- Lane departure: Lane Departure Warning warning
- Low tire pressure warning
- Oil pressure gauge
- Outside temperature display
- Parking sensors: Front and Rear Park Assist front and rear
- 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
- Forward collision: Forward Collision Alert with Automatic Braking mitigation
- Ignition disable
- Occupant sensing airbag
- Overhead airbag
- Panic alarm
- Perimeter/approach lights
- Rear collision: Rear Cross-Traffic Alert warning
- Security system
- Traction control
Dealer Notes
Vehicle Details
Power, prestige, and capability meet in this 2021 GMC Sierra 2500 Denali 4WD a bold diesel pickup designed to dominate work and weekend. Powered by a proven V8 6.6L Duramax diesel, this GMC Sierra 2500 delivers massive towing and torque for heavy-duty jobs, while the Denali trim ensures luxury appointments throughout the cabin. Located in Kilgore, TX, this truck pairs rugged Off-Road Package capability with premium comfort: supple leather seats, a heated steering wheel for chilly mornings, and advanced tech including Apple CarPlay and built-in Navigation for seamless connectivity on every route. This 4WD GMC Sierra 2500 Denali rides confidently over rough terrain thanks to the Off-Road Package, while the diesel V8 offers exceptional fuel economy under load and long-term durability. The upscale interior features thoughtful conveniences and durable finishes ideal for both daily driving and demanding work sites. Whether you're towing a trailer, hauling heavy gear, or simply wanting a commanding presence on the road, this truck checks every box. Located in Kilgore, TX, this GMC Sierra is competitively priced offering the best price for its condition, features, and diesel performance. Don't miss your chance to own a luxury-grade heavy-duty pickup with proven capability. Contact us today to schedule a test drive and experience the power and refinement of this 2021 GMC Sierra 2500 Denali for yourself.
Equipment
This model offers Android Auto for seamless smartphone integration. The steering wheel audio controls on this unit keep the volume and station within easy reach. An off-road package is installed on the GMC Sierra so you are ready for your four-wheeling best. You'll never again be lost in a crowded city or a country region with the navigation system on this model. Never get into a cold vehicle again with the remote start feature on this vehicle. Engulf yourself with the crystal clear sound of a BOSE sound system in the GMC Sierra. Good News! This certified CARFAX 1-owner vehicle has only had one owner before you. This unit is pure luxury with a heated steering wheel. This model's Lane Departure Warning helps keep you in your lane. Apple CarPlay: Seamless smartphone integration for this model - stay connected and entertained on the go! This 2021 GMC Sierra 2500 warns of approaching vehicles with Cross-Traffic Alert.
Packages
Technology Package: Multicolor 15" Diagonal Head-Up Display; Inside Rearview Auo-Dimming Rear Camera Mirror. Denali Ultimate Package: Power Sunroof. Preferred Equipment Group 5SA: LED Cargo Area Lighting; Remote Vehicle Starter System; 2 USB Ports (1st Row); Power Sliding Rear Window with Defogger; Safety Alert Seat; Electric Rear-Window Defogger; Wireless Phone Projection; Floor-Mounted Center Console; Unauthorized Entry Theft-Deterrent System; Signature Denali Grille; Bed View Camera with Two Trailer Camera Provisions; Compass Located in Instrument Cluster; HD Surround Vision; Electrical Lock Control Steering Column; Driver Alert Package II; 120-Volt Instrument Panel Power Outlet; LED Smoked Amber Roof Marker Lamps; Heated Driver and Front Outboard Passenger Seats; Wireless Charging; X31 Off-Road Package; Steering Wheel Audio Controls; Universal Home Remote; Driver Alert Package I; OnStar and GMC Connected Services Capable; 120-Volt Bed Mounted Power Outlet; Heated 2nd Row Outboard Seats; Power Front Passenger Windows with Express Up/down; 2-Speed Active Transfer Case; Deep-Tinted Glass; Spray-On Pickup Box Bed Liner with Denali Logo; Power Rear Windows with Express Down; Integrated Trailer Brake Controller; Premium GMC Infotainment System Radio with Navigation; Power Windows with Driver Express Up/down; Heated and Ventilated Front Bucket Seats; Manual Tilt-Wheel/telescoping Steering Column; 2nd Row Dual USB Charge-Only Ports; Keyless Open and Start; ProGrade Trailering System; Rear Wheelhouse Liners; 6" Rectangular Chromed Tubular Assist Steps; 12-Volt Rear Auxiliary Power Outlet; 2 USB Ports; Polished Exhaust Tip; Power Door Locks; Chrome Recovery Hooks. 20" High Gloss Black Painted Wheels. Power Retractable Assist Steps. Power Sunroof. Hunter Metallic. **Equipment listed is based on original vehicle build and subject to change. Please confirm the accuracy of the included equipment by calling the dealer prior to purchase.**
Power, prestige, and capability meet in this 2021 GMC Sierra 2500 Denali 4WD a bold diesel pickup designed to dominate work and weekend. Powered by a proven V8 6.6L Duramax diesel, this GMC Sierra 2500 delivers massive towing and torque for heavy-duty jobs, while the Denali trim ensures luxury appointments throughout the cabin. Located in Kilgore, TX, this truck pairs rugged Off-Road Package capability with premium comfort: supple leather seats, a heated steering wheel for chilly mornings, and advanced tech including Apple CarPlay and built-in Navigation for seamless connectivity on every route. This 4WD GMC Sierra 2500 Denali rides confidently over rough terrain thanks to the Off-Road Package, while the diesel V8 offers exceptional fuel economy under load and long-term durability. The upscale interior features thoughtful conveniences and durable finishes ideal for both daily driving and demanding work sites. Whether you're towing a trailer, hauling heavy gear, or simply wanting a commanding presence on the road, this truck checks every box. Located in Kilgore, TX, this GMC Sierra is competitively priced offering the best price for its condition, features, and diesel performance. Don't miss your chance to own a luxury-grade heavy-duty pickup with proven capability. Contact us today to schedule a test drive and experience the power and refinement of this 2021 GMC Sierra 2500 Denali for yourself.
Equipment
This model offers Android Auto for seamless smartphone integration. The steering wheel audio controls on this unit keep the volume and station within easy reach. An off-road package is installed on the GMC Sierra so you are ready for your four-wheeling best. You'll never again be lost in a crowded city or a country region with the navigation system on this model. Never get into a cold vehicle again with the remote start feature on this vehicle. Engulf yourself with the crystal clear sound of a BOSE sound system in the GMC Sierra. Good News! This certified CARFAX 1-owner vehicle has only had one owner before you. This unit is pure luxury with a heated steering wheel. This model's Lane Departure Warning helps keep you in your lane. Apple CarPlay: Seamless smartphone integration for this model - stay connected and entertained on the go! This 2021 GMC Sierra 2500 warns of approaching vehicles with Cross-Traffic Alert.
Packages
Technology Package: Multicolor 15" Diagonal Head-Up Display; Inside Rearview Auo-Dimming Rear Camera Mirror. Denali Ultimate Package: Power Sunroof. Preferred Equipment Group 5SA: LED Cargo Area Lighting; Remote Vehicle Starter System; 2 USB Ports (1st Row); Power Sliding Rear Window with Defogger; Safety Alert Seat; Electric Rear-Window Defogger; Wireless Phone Projection; Floor-Mounted Center Console; Unauthorized Entry Theft-Deterrent System; Signature Denali Grille; Bed View Camera with Two Trailer Camera Provisions; Compass Located in Instrument Cluster; HD Surround Vision; Electrical Lock Control Steering Column; Driver Alert Package II; 120-Volt Instrument Panel Power Outlet; LED Smoked Amber Roof Marker Lamps; Heated Driver and Front Outboard Passenger Seats; Wireless Charging; X31 Off-Road Package; Steering Wheel Audio Controls; Universal Home Remote; Driver Alert Package I; OnStar and GMC Connected Services Capable; 120-Volt Bed Mounted Power Outlet; Heated 2nd Row Outboard Seats; Power Front Passenger Windows with Express Up/down; 2-Speed Active Transfer Case; Deep-Tinted Glass; Spray-On Pickup Box Bed Liner with Denali Logo; Power Rear Windows with Express Down; Integrated Trailer Brake Controller; Premium GMC Infotainment System Radio with Navigation; Power Windows with Driver Express Up/down; Heated and Ventilated Front Bucket Seats; Manual Tilt-Wheel/telescoping Steering Column; 2nd Row Dual USB Charge-Only Ports; Keyless Open and Start; ProGrade Trailering System; Rear Wheelhouse Liners; 6" Rectangular Chromed Tubular Assist Steps; 12-Volt Rear Auxiliary Power Outlet; 2 USB Ports; Polished Exhaust Tip; Power Door Locks; Chrome Recovery Hooks. 20" High Gloss Black Painted Wheels. Power Retractable Assist Steps. Power Sunroof. Hunter Metallic. **Equipment listed is based on original vehicle build and subject to change. Please confirm the accuracy of the included equipment by calling the dealer prior to purchase.**
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… - 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!… - 3.0
Don't judge a truck by the appearance
By jmil | on Wednesday, May 11, 2022
Great truck, loved it until the DEF tank heater malfunctioned and shut down the truck. Now sitting waiting for the replacement tank for over 10 weeks. Turns out every HD truck 2020 and 2021 has the same problem and all will need this replacement that is being produced at a snail's pace by GM. Per the dealership, last count, over 9000 trucks like mine are idle waiting for this part. $65000 waste of money and terrible service by GMC (not the local dealership).…
Based on 13 consumer ratings for 2020–2025 models. | Privacy
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Prices shown are manufacturer suggested retail prices only and do not include taxes, license, or doc fee. Manufacturer vehicle accessory costs, labor and installation vary. Please contact us with any questions.
Based on 2022 EPA mileage and driving range ratings. Use for comparison purposes only. Your MPGe/MPG and driving range will vary depending on driving conditions, how you drive and maintain your vehicle, lithium-ion battery age/condition, and other factors. For additional information about EPA ratings, visit http://www.fueleconomy.gov/feg/label/learn-more-PHEV-label.shtml.
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