This 2020 Onyx Black GMC Sierra 2500HD SLT 4WD is well equipped and includes these features and benefits:
Clean CARFAX.
Fairfield's Auto Group, located in beautiful Keene, NH, and serving the New Hampshire, Vermont, Massachusetts, and New England region. Our experienced sales staff is eager to share its knowledge and enthusiasm with you. They'll work with you to find the right vehicle at a price you can afford. Come on in and take a test drive! Please call (603) 352-7700.
Pre-Owned 2020 GMCSierra 2500HD SLT
- Diesel
- Exterior Color
- Onyx Black
- Interior Color
- Jet Black
- Odometer
- 18,768 miles
- Body/Seating
- Truck Double Cab/5 seats
- Transmission
- 10-Speed Automatic
- Drivetrain
- 4x4
- Engine
- 8
- VIN
- 1GT29NEY5LF202764
- Stock Number
- G26266A
Highlighted Features
- Navigation system
- Lane departure
- Leather upholstery
- Automatic temperature control
- Premium audio system
- Wireless phone connectivity
- Parking sensors
- Exterior parking camera front
- Exterior parking camera left
- Exterior parking camera right
- Exterior parking camera rear
- Front dual zone A/C
Included Packages & Accessories
- Front License Plate Kit
- Hitch Package
- Rear Underseat Storage
- Trailer Tire Pressure Monitor Sensors
- Chrome Recovery Hooks
- GVWR: 10,000 lbs
- Wheels: 18" 6-Spoke Machined Aluminum
- Pickup Box
- 6" Rectangular Chrome Tubular Assist Steps
- LED Smoked Amber Roof Marker Lamps
- Bose Premium 7 Speaker Sound System
- Wireless Charging
- IntelliBeam Automatic High Beam On/Off
- Following Distance Indicator
- 8" Multicolor Driver Information Center
- Lane Change Alert w/Side Blind Zone Alert
- Skid Plates
- Transmission: Allison 10-Speed Automatic
- Radio: Premium GMC Infotainment Sys w/Navigation
- Preferred Equipment Group 4SA
- Radio: AM/FM w/Premium GMC Infotainment System
- 6-Speaker Audio System Feature
- SiriusXM w/360L
- HD Radio
- Compass Located In Instrument Cluster
- 4.2" Diagonal Color Display Driver Info Center
- 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
- 2nd Row Dual USB Charge-Only Ports
- Front 40/20/40 Split-Bench Seats w/Lockable Storage
- 10-Way Power Driver Seat Adjuster w/Lumbar
- 10-Way Power Passenger Seat Adjuster w/Lumbar
- Driver Memory
- Heated Driver & Front Outboard Passenger Seats
- Steering Wheel Audio Controls
- Manual Tilt-Wheel/Telescoping Steering Column
- Electrical Lock Control Steering Column
- Unauthorized Entry Theft-Deterrent System
- Deep-Tinted Glass
- Chrome Surround Grille w/High Gloss Black Mesh
- Power Windows w/Driver Express Up/Down
- Power Front Passenger Windows w/Express Up/Down
- Power Rear Windows w/Express Down
- LED Cargo Area Lighting
- Rear Wheelhouse Liners
- 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: 10,550 lbs
- 2-Speed Active Transfer Case
- Safety Alert Seat
- Ultrasonic Front & Rear Park Assist
- Floor-Mounted Center Console
- Black Front & Rear Molded Splash Guards
- Snow Plow Prep/Camper Package
- 220 Amps Alternator
- Heated & Ventilated Front Bucket Seats
- Hill Descent Control
- SLT Convenience Package
- Front Bucket Seats
- Power Sliding Rear Window w/Defogger
- Universal Home Remote
- 2 USB Ports
- Driver Alert Package I
- Rear Cross Traffic Alert
- Perimeter Lighting
- Gooseneck/5th Wheel Prep Package
- Winter Grille Cover
- Engine Block Heater
- GMC Protection Package
- 1st & 2nd Row All-Weather Floor Liner
- Bed View Camera
- X31 Off-Road Package
- Off-Road Suspension
- Rear Camera Mirror
- 3.42 Axle Ratio
- Engine: Duramax 6.6L Turbo-Diesel V8
- Capped Fuel Fill
- Dual Heavy-Duty 70 Amp Battery
- Exhaust Brake
- GVWR: 11,200 lbs
- Technology Package
- HD Surround Vision w/2 Trailer View Camera Provisions
- Multicolor 15" Diagonal Head-Up Display
- Automatic Emergency Braking
- Driver Alert Package II
- Forward Collision Alert
- Lane Departure Warning
- Tires: LT275/70R18E AT BW
- Spare LT275/70R18 AT BW Tire
- Spray-On Pickup Box Bed Liner w/GMC Logo
- SLT Preferred Package
- Gooseneck/5th Wheel Package
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
- Navigation system
- 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
- Premium audio system: Premium GMC Infotainment System
- Primary LCD size: 8.0"
- Smart device integration: Apple CarPlay/Android Auto
- Speaker type: Bose
- Speakers: 7
- Steering wheel mounted audio controls
- Wireless phone connectivity: Bluetooth
- Front center armrest: w/storage
- Front seats: bucket
- Heated front 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 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 economy fuel type: gasoline
- 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
- Torque: 910 lb.-ft. @ 1,600RPM
- Transmission: 10 speed automatic
- Variable valve control
- Ground clearance (min): 259mm (10.2")
- Auto-dimming door mirrors
- Bedliner
- 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
- Skid plates
- Trailer hitch receiver
- Trailer sway control
- Turn signal indicator mirrors
- Compression ratio: 16.00 to 1
- Curb weight: 3,455kg (7,616lbs)
- 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: 2,031mm (80.0")
- Exterior length: 6,107mm (240.5")
- 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")
- GVWR: 4,536kg (10,000lbs)
- Payload: 1,608kg (3,546lbs)
- Rear headroom: 1,013mm (39.9")
- Rear hiproom: 1,530mm (60.2")
- Rear legroom: 895mm (35.2")
- Rear shoulder room: 1,648mm (64.9")
- Towing capacity: 6,577kg (14,500lbs)
- Turning radius: 7.5m (24.8')
- Wheelbase: 3,795mm (149.4")
- 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: HD Surround Vision yes
- 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: UltraSonic 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
Standard Features
- Capped Fuel Fill
- 220 Amps Alternator
- Dual Heavy-Duty 70 Amp Battery
- Winter Grille Cover
- Exhaust Brake
- Engine Block Heater
- 3.42 Axle Ratio
- Transmission: Allison 10-Speed Automatic
- GVWR: 11,200 lbs
- HD Surround Vision w/2 Trailer View Camera Provisions
- Rear Camera Mirror
- Bed View Camera
- Multicolor 15" Diagonal Head-Up Display
- 8" Multicolor Driver Information Center
- Front Bucket Seats
- Floor-Mounted Center Console
- Heated & Ventilated Front Bucket Seats
- Power Sliding Rear Window w/Defogger
- Universal Home Remote
- 2 USB Ports
- LED Smoked Amber Roof Marker Lamps
- Gooseneck/5th Wheel Prep Package
- Spray-On Pickup Box Bed Liner w/GMC Logo
- Bed View Camera
- Radio: Premium GMC Infotainment Sys w/Navigation
- Bose Premium 7 Speaker Sound System
- Wireless Charging
- Ultrasonic Front & Rear Park Assist
- Lane Change Alert w/Side Blind Zone Alert
- Rear Cross Traffic Alert
- Perimeter Lighting
- Forward Collision Alert
- Lane Departure Warning
- Automatic Emergency Braking
- IntelliBeam Automatic High Beam On/Off
- Following Distance Indicator
- Safety Alert Seat
- 1st & 2nd Row All-Weather Floor Liner
- Black Front & Rear Molded Splash Guards
- Hill Descent Control
- Skid Plates
- Off-Road Suspension
- 220 Amps Alternator
- Skid Plates
- 4G LTE Wi-Fi Hotspot Capable
- GMC Connected Access Capable
- Spare LT275/70R18 AT BW Tire
- Heated Driver & Front Outboard Passenger Seats
- 10-Way Power Driver Seat Adjuster w/Lumbar
- 10-Way Power Driver Seat Adjuster w/Lumbar
- 10-Way Power Passenger Seat Adjuster w/Lumbar
- Driver Memory
- Heated Driver & Front Outboard Passenger Seats
- 6-Speaker Audio System Feature
- SiriusXM w/360L
- HD Radio
- Radio: AM/FM w/Premium GMC Infotainment System
- Compass Located In Instrument Cluster
- 4.2" Diagonal Color Display Driver Info Center
- Electric Rear-Window Defogger
- Power Door Locks
- Remote Vehicle Starter System
- Keyless Open & Start
- OnStar & GMC Connected Services Capable
- 12-Volt Rear Auxiliary Power Outlet
- 120-Volt Instrument Panel Power Outlet
- 120-Volt Bed Mounted Power Outlet
- 2nd Row Dual USB Charge-Only Ports
- Front 40/20/40 Split-Bench Seats w/Lockable Storage
- Steering Wheel Audio Controls
- Manual Tilt-Wheel/Telescoping Steering Column
- Electrical Lock Control Steering Column
- Unauthorized Entry Theft-Deterrent System
- Deep-Tinted Glass
- Chrome Surround Grille w/High Gloss Black Mesh
- Power Windows w/Driver Express Up/Down
- Power Front Passenger Windows w/Express Up/Down
- Power Rear Windows w/Express Down
- LED Cargo Area Lighting
- Rear Wheelhouse Liners
- Integrated Trailer Brake Controller
- ProGrade Trailering System
- Engine: 6.6L V8 w/Direct Injection & VVT
- 2-Speed Active Transfer Case
- Heavy-Duty 80 Amp Battery
- GVWR: 10,550 lbs
- Hitch Guidance w/Hitch View
- In-Vehicle Trailering System App
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 - 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!
