Drive our Diesel powered **2021**GMC**Sierra 2500**AT4**Crew Cab**4X4**X31 Off-Road Package**Sunroof** in Ebony Twilight Metallic and get to work on the toughest terrain! Motivated by a TurboCharged 6.6 Liter DuraMax Diesel V8 offering 445hp and 910lb-ft of torque paired to a 10 Speed Allison Automatic transmission for terrific towing and hauling performance. This Four Wheel Drive truck also rides on an off-road suspension for on-demand capability, and it rocks a rugged design with LED lighting, fog lamps, red recovery hooks, skid plates, a spray-on bed liner, alloy wheels, side/rear bed steps, power-folding trailer mirrors, a power sunroof, and a versatile MultiPro tailgate.
Our AT4 cabin maintains your comfort on the move with leather heated/ventilated front and heated rear seats, a heated leather steering wheel, cruise control, power accessories, dual-zone automatic climate control, 12V/120V power outlets, and remote start. Maintain your connections, too, with an 8-inch touchscreen, wireless Android Auto®/Apple CarPlay®, Bluetooth®, WiFi compatibility, and a six-speaker audio system. You'll appreciate features like these on every drive.
GMC helps keep you out of harm's way even when working hard thanks to a robust steel frame plus an HD backup camera, hitch guidance with a hitch-view camera, tire-pressure monitoring, airbags, a rear-seat reminder, and more. So add our Sierra AT4 to your team and take on the world! Save this Page and Call for Availability. We Know You Will Enjoy Your Test Drive Towards Ownership!
Pre-Owned 2021 GMCSierra 2500 HD AT4 4x4
- Exterior Color
- Ebony Twilight
- Interior Color
- Jet Black
- Odometer
- 84,793 miles
- Body/Seating
- Truck Crew Cab/5 seats
- Transmission
- 10-Speed Automatic
- Drivetrain
- 4x4
- Engine
- V-8 cyl
- VIN
- 1GT49PEY6MF128549
- Stock Number
- 7S1031
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
- AT4 Preferred Package
- Driver Alert Package I
- Driver Alert Package II
- Gooseneck/5th Wheel Package
- Gooseneck/5th Wheel Prep Package
- Hitch Package (LPO)
- Preferred Equipment Group 4SB
- Snow Plow Prep/Camper Package
- Technology Package
- X31 Off-Road Package
- 6 Speakers
- 6-Speaker Audio System Feature
- AM/FM radio: SiriusXM with 360L
- Bose Premium 7 Speaker Sound System
- HD Radio
- Premium audio system: Premium GMC Infotainment System
- Radio: AM/FM w/Premium GMC Infotainment System
- Radio: Premium GMC Infotainment Sys w/Navigation
- SiriusXM w/360L
- Steering Wheel Audio Controls
- Air Conditioning
- Automatic temperature control
- Electric Rear-Window Defogger
- Front dual zone A/C
- Rear window defroster
- 12-Volt Rear Auxiliary Power Outlet
- 120-Volt Bed Mounted Power Outlet
- 120-Volt Instrument Panel Power Outlet
- Driver Memory
- Memory seat
- Power driver seat
- Power steering
- Power windows
- Power Windows w/Driver Express Up/Down
- Remote keyless entry
- Remote Vehicle Starter System
- Steering wheel mounted audio controls
- Universal Home Remote
- Manual Tilt-Wheel/Telescoping Steering Column
- Off-Road Suspension
- Speed-sensing steering
- Traction control
- 4-Wheel Disc Brakes
- ABS brakes
- Dual front impact airbags
- Dual front side impact airbags
- Electrical Lock Control Steering Column
- Front anti-roll bar
- Front wheel independent suspension
- Keyless Open & Start
- Low tire pressure warning
- Occupant sensing airbag
- Overhead airbag
- Power Door Locks
- Power Sunroof
- Pickup Box
- Brake assist
- Electronic Stability Control
- Lane Departure Warning System
- Hill Descent Control
- Delay-off headlights
- Front fog lights
- Fully automatic headlights
- Perimeter Lighting
- Panic alarm
- Security system
- Unauthorized Entry Theft-Deterrent System
- Speed control
- 2-Speed Active Transfer Case
- 220 Amps Alternator
- Engine Block Heater
- Exhaust Brake
- Heavy-Duty 80 Amp Battery
- High Idle Switch
- Auto-dimming door mirrors
- Bumpers: body-color
- Front License Plate Kit
- Heated door mirrors
- IntelliBeam Automatic High Beam On/Off
- LED Cargo Area Lighting
- LED Smoked Amber Roof Marker Lamps
- Painted Black Surround Grille
- Power door mirrors
- Rear step bumper
- Rear Wheelhouse Liners
- Red Recovery Hooks
- Spray-On Pickup Box Bed Liner w/AT4 Logo
- Turn signal indicator mirrors
- Winter Grille Cover
- 1st & 2nd Rows All-Weather Floor Liners (LPO)
- 2 USB Ports
- 2 USB Ports (1st Row)
- 2nd Row Dual USB Charge-Only Ports
- 4.2" Diagonal Color Display Driver Info Center
- 4G LTE Wi-Fi Hotspot Capable
- 8" Multicolor Driver Information Center
- Apple CarPlay/Android Auto
- Auto-dimming Rear-View mirror
- Automatic Emergency Braking
- Bed View Camera w/2 Trailer Camera Provisions
- Compass
- Compass Located In Instrument Cluster
- Driver door bin
- Driver vanity mirror
- Floor-Mounted Center Console
- Following Distance Indicator
- Forward Collision Alert
- Front Prem Floor Liners w/Removable Carpet Insert
- Front reading lights
- GMC Connected Access Capable
- HD Rear Vision Camera
- HD Surround Vision
- Heated steering wheel
- Illuminated entry
- Inside Rearview Auto-Dimming Rear Camera Mirror
- Lane Change Alert w/Side Blind Zone Alert
- Multicolor 15" Diagonal Head-Up Display
- OnStar & GMC Connected Services Capable
- Outside temperature display
- Overhead console
- Passenger vanity mirror
- Rear Cross Traffic Alert
- Rear Prem Floor Liners w/Removable Carpet Insert
- Rear reading lights
- Rear seat center armrest
- Tachometer
- Telescoping steering wheel
- Tilt steering wheel
- Trip computer
- Ultrasonic Front & Rear Park Assist
- Voltmeter
- Wireless Charging
- Wireless Phone Projection
- 10-Way Power Driver Seat Adjuster w/Lumbar
- 10-Way Power Passenger Seat Adjuster w/Lumbar
- Front Bucket Seats
- Front Center Armrest
- Heated & Ventilated Front Bucket Seats
- Heated 2nd Row Outboard Seats
- Heated Driver & Front Outboard Passenger Seats
- Heated front seats
- Heated rear seats
- Perforated Leather-Appointed Front Seat Trim
- Power passenger seat
- Safety Alert Seat
- Split folding rear seat
- Ventilated front seats
- Passenger door bin
- Hitch Guidance w/Hitch View
- In-Vehicle Trailering System App
- Integrated Trailer Brake Controller
- 18" Machined Aluminum Wheels
- Alloy wheels
- Deep-Tinted Glass
- Power Front Passenger Windows w/Express Up/Down
- Power Rear Windows w/Express Down
- Power Sliding Rear Window w/Defogger
- Variably intermittent wipers
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
- 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).
** Price(s) include(s) all costs to be paid by a consumer including $399 documentation fee, except for licensing costs, registration fees, and taxes.
