Vehicle Details
2021 GMC Sierra 3500 SLT 4WD â" a powerful, low-mileage diesel workhorse located in East Dubuque, IL. With only 12,213 miles, this V8 6.6L Duramax diesel pairs serious towing capability with refined comfort, making it ideal for heavy-duty tasks and daily driving alike. The automatic transmission delivers smooth shifts while 4WD provides confident traction in varied conditions. Inside, the SLT trim brings premium convenience and connectivity. Automatic climate control keeps the cabin comfortable on long hauls, while Android Auto and Apple CarPlay integrate your smartphone for navigation, music, and messaging. Hands-free Bluetooth lets you stay connected safely, and rear parking sensors assist with maneuvering trailers and tight spots. This GMC Sierra 3500 stands out for its combination of low mileage, diesel torque, and thoughtful features â" and it's priced to move. You won't find a better value in the area; this vehicle offers the best price for buyers seeking capability without compromise. Whether you need exceptional towing performance for work or a dependable, well-equipped truck for personal use, this GMC Sierra delivers. Located in East Dubuque, IL, this 2021 GMC Sierra 3500 SLT is ready for test drives and inspection. Contact us to schedule an appointment and see why this low-mileage diesel is the smart choice for heavy-duty performance at the best price.
Equipment
Keep your hands warm all winter with a heated steering wheel in this 2021 GMC Sierra 3500 . This vehicle features steering wheel audio controls. This unit comes equipped with Android Auto for seamless smartphone integration on the road. This GMC Sierra has only one previous owner, verified by AutoCheck. Apple CarPlay: Seamless smartphone integration for the GMC Sierra - stay connected and entertained on the go! This model's Lane Departure Warning keeps you safe by alerting you when you drift from your lane. An off-road package is installed on this GMC Sierra so you are ready for your four-wheeling best. Protect this 2021 GMC Sierra 3500 from unwanted accidents with a cutting edge backup camera system. This 2021 GMC Sierra 3500 keeps you comfortable with Auto Climate. Bluetooth technology is built into this unit, keeping your hands on the steering wheel and your focus on the road. It has a clean AutoCheck report, ensuring its impeccable vehicle history.
Packages
Driver Alert Package I: Ultrasonic Front and Rear Park Assist; Rear Cross Traffic Alert; Lane Change Alert with Side Blind Zone Alert; Perimeter Lighting. Driver Alert Package II: Forward Collision Alert; Following Distance Indicator; Automatic Emergency Braking; Safety Alert Seat; IntelliBeam Automatic High Beam On/off; Lane Departure Warning. X31 Off-Road and Protection Package: LT275/65R20 AT BW Tires; Spray-On Pickup Bed Liner with GMC Logo; All-Weather Floor Liners; 20 Machined Aluminum Wheels. X31 Off-Road Package: Off-Road Suspension; Hill Descent Control; Skid Plates. Preferred Equipment Group 4SA: LED Cargo Area Lighting; Remote Vehicle Starter System; Electric Rear-Window Defogger; Wireless Phone Projection; Unauthorized Entry Theft-Deterrent System; Chrome Surround Grille with High Gloss Black Mesh; Compass Located in Instrument Cluster; 4.2 Diagonal Color Display Driver Info Center; Electrical Lock Control Steering Column; 120-Volt Instrument Panel Power Outlet; Front 40/20/40 Split-Bench Seat with Storage; Steering Wheel Audio Controls; GMC Connected Access Capable; OnStar and GMC Connected Services Capable; 120-Volt Bed Mounted Power Outlet; Power Front Passenger Windows with Express Up/down; 2-Speed Active Transfer Case; Deep-Tinted Glass; AM/FM Stereo with Premium GMC Infotainment System; Power Rear Windows with Express Down; Integrated Trailer Brake Controller; Power Front Windows with Driver Express Up/down; Manual Tilt-Wheel/telescoping Steering Column; 2nd Row Dual USB Charge-Only Ports; Keyless Open and Start; 4G LTE Wi-Fi Hotspot Capable; ProGrade Trailering System; Rear Wheelhouse Liners; 12-Volt Rear Auxiliary Power Outlet; Power Door Locks. Snow Plow Prep/camper Package. Gooseneck/5th Wheel Package: Gooseneck/5th Wheel Prep Package; Spray-On Pickup Bed Liner with GMC Logo; Bed View Camera with Two Trailer Camera Provisions. 20 Machined Aluminum Wheels. 6 Rectangular Chromed Tubular Assist Steps. Spray-On Pickup Bed Liner with GMC Logo. Ebony Twilight Metallic. Bed View Camera with Two Trailer Camera Provisions. All-Weather Floor Liners. LT275/65R20 AT BW Tires. Skid Plates. LED Smoked Amber Roof Marker Lamps. **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.**
Used 2021 GMCSierra SLT
- Exterior Color
- Ebony Twilight Metallic
- Interior Color
- Jet Black
- Odometer
- 12,213 miles
- Transmission
- 10-speed automatic
- Drivetrain
- 4WD
- Engine
- V8, 6.6L
- VIN
- 1GT49UEY7MF215259
- Stock Number
- MF215259
GMC
Sierra
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
- Perimeter/approach lights
- Remote keyless entry
- Heated steering wheel
Included Packages & Accessories
- Driver Alert Package I: Ultrasonic Front and Rear Park Assist; Rear Cross Traffic Alert; Lane Change Alert with Side Blind Zone Alert; Perimeter Lighting
- Driver Alert Package II: Forward Collision Alert; Following Distance Indicator; Automatic Emergency Braking; Safety Alert Seat; IntelliBeam Automatic High Beam On/off; Lane Departure Warning
- X31 Off-Road and Protection Package: LT275/65R20 AT BW Tires; Spray-On Pickup Bed Liner with GMC Logo; All-Weather Floor Liners; 20 Machined Aluminum Wheels
- X31 Off-Road Package: Off-Road Suspension; Hill Descent Control; Skid Plates
- Preferred Equipment Group 4SA: LED Cargo Area Lighting; Remote Vehicle Starter System; Electric Rear-Window Defogger; Wireless Phone Projection; Unauthorized Entry Theft-Deterrent System; Chrome Surround Grille with High Gloss Black Mesh; Compass Located in Instrument Cluster; 4.2 Diagonal Color Display Driver Info Center; Electrical Lock Control Steering Column; 120-Volt Instrument Panel Power Outlet; Front 40/20/40 Split-Bench Seat with Storage; Steering Wheel Audio Controls; GMC Connected Access Capable; OnStar and GMC Connected Services Capable; 120-Volt Bed Mounted Power Outlet; Power Front Passenger Windows with Express Up/down; 2-Speed Active Transfer Case; Deep-Tinted Glass; AM/FM Stereo with Premium GMC Infotainment System; Power Rear Windows with Express Down; Integrated Trailer Brake Controller; Power Front Windows with Driver Express Up/down; Manual Tilt-Wheel/telescoping Steering Column; 2nd Row Dual USB Charge-Only Ports; Keyless Open and Start; 4G LTE Wi-Fi Hotspot Capable; ProGrade Trailering System; Rear Wheelhouse Liners; 12-Volt Rear Auxiliary Power Outlet; Power Door Locks
- Snow Plow Prep/camper Package
- Gooseneck/5th Wheel Package: Gooseneck/5th Wheel Prep Package; Spray-On Pickup Bed Liner with GMC Logo; Bed View Camera with Two Trailer Camera Provisions
- 20 Machined Aluminum Wheels
- 6 Rectangular Chromed Tubular Assist Steps
- Spray-On Pickup Bed Liner with GMC Logo
- Ebony Twilight Metallic
- Bed View Camera with Two Trailer Camera Provisions
- All-Weather Floor Liners
- LT275/65R20 AT BW Tires
- Skid Plates
- LED Smoked Amber Roof Marker Lamps
- Apple CarPlay/Android Auto smart device wireless mirroring
- Forward Collision Alert with Automatic Braking
- 4G LTE Wi-Fi Hotspot capable mobile hotspot internet access
- Hitch View rear mounted camera
- Predictive brake assist system
- Cruise control with steering wheel mounted controls
- Keyfob remote start
- Heated steering wheel
- Heated driver and front passenger seats
- Leather front seat upholstery
- Primary monitor touchscreen
- Lane Departure Warning
- Cross Traffic Alert collision warning
- Driver seat power reclining
- lumbar support
- cushion tilt
- fore/aft control and height adjustable control
- AutoTrac part and full-time 4WD
- Duramax 6.6L V-8 diesel direct injection
- intercooled turbo
- diesel
- engine with 445HP
- Teen Driver restricted driving mode/alerts
- Keyless Open/Keyless Start with hands-free access and push button start
- Keyfob window control
- Bluetooth wireless audio streaming
- Vehicle to trailer hitching assist
- Pickup box camera
- Lane Change Alert with Side Blind Zone Alert blind spot warning
- Following Distance Indicator
- GMC ProGrade Trailering System trailer light test
- GMC ProGrade Trailering System trailer light malfunction warning
- GMC ProGrade Trailering System trailer theft alarm
- Dual-zone front climate control
- IntelliBeam auto high-beam headlights
- Immobilizer
- Bluetooth handsfree wireless device connectivity
- Trailer brake controller
- Trailer Sway Control (TSC) trailer sway control
- ProGrade Trailering System vehicle and trailer reverse assist with visual graphic guidance only
- Premium GMC Infotainment System external memory control
- Internet radio capability
- Power extendable trailer mirrors
- StabiliTrak w/Proactive Roll Avoidance electronic stability control system with anti-roll
- Hill Descent Control (HDC)
- Hill Start Assist (HSA)
- Automatic climate control
- Rear seat check warning
- Front and Rear Park Assist front and rear parking sensors
- 1 exterior 120V AC power outlet
- 0.400 kW
- LED daytime running lights
- LED brake lights
- LED front fog lights
- Leather and metal-look steering wheel
- BedStep integrated side steps
Included Packages & Options
Included Options
- All-Weather Floor Liners$210
- Skid Plates$150
- LED Smoked Amber Roof Marker Lamps$55
Standard 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: Apple CarPlay/Android Auto
- Steering wheel mounted audio controls
- Wireless phone connectivity: Bluetooth
- Heated front seats
- Leather upholstery
- 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
- 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): 284mm (11.2")
- Auto-dimming door mirrors
- Bumpers: chrome
- Door mirrors: chrome
- Heated door mirrors
- Left rear passenger door: conventional
- Power door mirrors
- Rear cargo: tailgate
- Rear step bumper
- Right rear passenger: conventional
- Trailer hitch receiver
- Trailer sway control
- Turn signal indicator mirrors
- Exterior body width: 2,079mm (81.8")
- Exterior height: 2,054mm (80.9")
- Exterior length: 6,349mm (249.9")
- Front headroom: 1,093mm (43.0")
- Front hiproom: 1,554mm (61.2")
- Front legroom: 1,131mm (44.5")
- Front shoulder room: 1,676mm (66.0")
- Rear headroom: 1,019mm (40.1")
- 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

Overall4.2Out of 5
- 5.0
2020 GMC Denali 3500 HD Duramax is a BEAST!
By Merlinsmerc | on Friday, January 22, 2021
Pulling a conventional 10,000 lb trailer over mountain passes is a whole new experience. Staying at the speed limit up long steep grades did not change the engine temperature. I feathered the accelerator up the mountain. The new 10 speed transmission is so smooth you cant feel it changing gears. This is my second GMC Denali Duramax, first being a 2016. I debated trading in for over a year, and am so happy I made the trade. Trailers always exceed by far the tongue weight posted on them, and in my case it came in at 1450 lbs. That exceeded my trucks posted maximum. The 2020 dually posts a 2,000 lb tongue weight, so now I can front load the trailer, and that reduces sway. If you can afford it, and have a heavy trailer, buy the truck!… - 5.0
Love our truck
By Ron | on Friday, December 11, 2020
The truck doesn’t have a sun roof which it was suppose to have… - 2.0
In shop for 13 weeks so far!
By Whip | on Monday, September 09, 2024
My truck has been in the shop for 13 weeks to this point with no end in sight. The Infotainment panel blew out which controls pretty much everything. Nice truck except if something goes wrong then, good luck! I would recommend looking at Fords and Rams and ask the question, how many vehicles do you have in your shop waiting for parts and for how long. I heard of one at my GMC dealership that has been waiting for 8 months! Only thing I get from GM is "we understand your frustration". Apparently they don't, or I would have my truck back long ago.…
Based on 6 consumer ratings for 2020–2025 models. | Privacy
* The advertised price does not include sales tax, vehicle registration fees, other fees required by law, finance charges and any documentation charges. A negotiable administration fee, up to $115, may be added to the price of the vehicle.
* Images, prices, and options shown, including vehicle color, trim, options, pricing and other specifications are subject to availability, incentive offerings, current pricing and credit worthiness.
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