The 2024 GMC Sierra 2500HD Denali Ultimate isnt just a heavy-duty truckits a statement of capability wrapped in absolute luxury. Finished in deep Onyx Black with the rich Alpine Umber interior, this Denali Ultimate looks every bit as serious as the work its built to handle. Its the kind of truck that turns heads pulling into the jobsite and feels just as at home cruising down I-95 or towing through back roads with confidence.
Under the hood, the 6.6L Duramax turbo-diesel delivers the kind of effortless power that seasoned truck owners appreciate. Matched to a 10-speed automatic and a four-wheel-drive system built for real-world conditions, this Sierra is made for hauling, towing, and tackling Maine weather without hesitation. The Max Trailering Package, gooseneck and fifth-wheel prep, advanced trailering tech, and in-vehicle trailering app make this a true workhorsesmart, stable, and ready for serious loads.
Step inside and its clear this isnt your average HD pickup. The Denali Ultimate cabin surrounds you with premium materials, massaging leather seats, heated and cooled comfort, a heated steering wheel, and a heads-up display that keeps key info right where you need it. Long hauls feel shorter, cold mornings feel easier, and every drive feels refined. This truck works hardbut it treats you even better.
Technology and safety are fully dialed in, from the surround-view camera system and adaptive cruise control to lane departure alerts, front collision mitigation, and rear parking assistance. Whether youre backing up a trailer at the camp, navigating a crowded lot, or heading out before sunrise, this Sierra has your back.
This is the truck for someone who demands moremore strength, more intelligence, and more comfort. The 2024 GMC Sierra 2500HD Denali Ultimate is built for those who work hard, tow heavy, and refuse to compromise on luxury along the way.
Used 2024 GMC Sierra 2500 HD Denali Ultimate (Premium) Truck Crew Cab Photo 1 of 32
































































































Used 2024 GMCSierra 2500 HD Denali Ultimate (Premium)
- Diesel
- Exterior Color
- Onyx Black
- Interior Color
- Alpine Umber
- Odometer
- 37,248 miles
- Body/Seating
- Truck Crew Cab/5 seats
- Transmission
- 10-Speed Automatic
- Drivetrain
- 4x4
- Engine
- V-8 cyl
- VIN
- 1GT49XEY9RF284706
- Stock Number
- 377784A
GMC
Sierra 2500 HD
Highlighted Features
- Lane departure
- Leather upholstery
- Automatic temperature control
- Emergency communication system
- 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
- 12 Speakers
- AM/FM radio: SiriusXM with 360L
- Premium audio system: Premium GMC Infotainment System
- Radio: AM/FM w/Premium GMC Infotainment System
- SiriusXM w/360L
- Air Conditioning
- Automatic temperature control
- Front dual zone A/C
- Rear window defroster
- Heads-Up Display
- Memory seat
- Power driver seat
- Power steering
- Power windows
- 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
- Emergency communication system: OnStar and GMC connected services capable
- Front anti-roll bar
- Front wheel independent suspension
- Keyless Open & Start
- Low tire pressure warning
- Occupant sensing airbag
- Overhead airbag
- Power moonroof
- Pickup Box
- Brake assist
- Electronic Stability Control
- Lane Departure Warning System
- Auto High-beam Headlights
- Delay-off headlights
- Front fog lights
- Fully automatic headlights
- Panic alarm
- Security system
- Speed control
- 220-Amp Alternator
- Block heater
- Dual 220-Amps Primary/170-Amps Aux Alternators
- Dual Heavy-Duty 70 Amp Battery
- High Idle Switch
- Auto-dimming door mirrors
- Bumpers: body-color
- Front License Plate Kit
- GMC MultiPro Tailgate Step Lights (LPO)
- Heated door mirrors
- IntelliBeam Automatic High Beam On/Off
- Power door mirrors
- Rear step bumper
- Spray-On Bedliner w/Denali Logo
- Turn signal indicator mirrors
- Apple CarPlay/Android Auto
- Auto-dimming Rear-View mirror
- Automatic Emergency Braking
- Bed View Camera w/2 Trailer Camera Provisions
- Buckle to Drive
- Compass
- Driver door bin
- Driver vanity mirror
- Following Distance Indicator
- Forward Collision Alert
- Front Pedestrian Braking
- Front Prem Floor Liners w/Removable Carpet Insert
- Front reading lights
- Garage door transmitter
- Genuine wood dashboard insert
- Genuine wood door panel insert
- Heated steering wheel
- Illuminated entry
- Inside Rearview Auto-Dimming Rear Camera Mirror
- Leather steering wheel
- OnStar & GMC Connected Services Capable
- Outside temperature display
- Overhead console
- Passenger vanity mirror
- Rear Prem Floor Liners w/Removable Carpet Insert
- Rear reading lights
- Rear seat center armrest
- Tachometer
- Telescoping steering wheel
- Tilt steering wheel
- Trailer Cam Provisions & Trailer Viewing Software
- Trip computer
- Ultrasonic Front & Rear Park Assist
- Voltmeter
- 16-Way Power Driver Seat Adjuster w/Lumbar
- 16-Way Power Passenger Seat Adjuster w/Lumbar
- Front Center Armrest
- Full Grain Leather Seat Trim
- Heated Driver & Front Outboard Passenger Seats
- Heated front seats
- Heated rear seats
- Power passenger seat
- Split folding rear seat
- Ventilated Driver & Front Passenger Seats
- Ventilated front seats
- Cargo Tie-Down Rings (Set of 4) (LPO)
- Passenger door bin
- Hitch Guidance w/Hitch View
- In-Vehicle Trailering System App
- Alloy wheels
- Wheels: 20" Ultra-Bright Machined Aluminum
- Power Front Passenger Windows w/Express Up/Down
- Power Sliding Rear Window w/Defogger
- Rain sensing wipers
- Variably intermittent wipers
- 3.42 Axle Ratio
- Gooseneck/5th Wheel Prep Package
- Max Trailering Package
- Preferred Equipment Group 5SB
- Technology Package
- X31 Off-Road Package
- Bose Premium Series 12-Speaker System
- Steering Wheel Audio Controls
- Electric Rear-Window Defogger
- 120-Volt Bed Mounted Power Outlet
- 120-Volt Instrument Panel Power Outlet
- Driver Memory
- Push Button Start
- Remote Vehicle Starter System
- Universal Home Remote
- Manual Tilt-Wheel/Telescoping Steering Column
- Off-Road Suspension
- Power Sunroof
- Hill Descent Control
- Unauthorized Entry Theft-Deterrent System
- 2-Speed Active Transfer Case
- LED Cargo Area Lighting
- LED Smoked Amber Roof Marker Lamps
- Rear Wheelhouse Liners
- Signature Denali Grille in Vadar Chrome
- 2 Charge-Only Rear USB Ports
- 2 Charge/Data USB Ports Inside Center Console
- 2 USB Ports
- Floor-Mounted Center Console
- GMC Connected Access Capable
- HD Surround Vision
- Multicolor 15" Diagonal Head-Up Display
- Rear Cross Traffic Alert
- Trailer Side Blind Zone Alert
- Wireless Charging
- Wireless Phone Projection
- Front Bucket Seats
- Heated 2nd Row Outboard Seats
- Safety Alert Seat
- Integrated Trailer Brake Controller
- Trailer Tire Pressure Monitor Sensors
- Deep-Tinted Glass
- Front Rain-Sensing Wipers
Included Packages & Options
- Max Trailering Package$1,540
- Gooseneck/5th Wheel Prep Package
Included Options
- High Idle Switch$200
Detailed Specifications
- 1-touch down
- 1-touch up
- Adaptive Cruise Control
- Air conditioning
- Auto-dimming rearview mirror
- Automatic temperature control
- Driver door bin
- Driver vanity mirror
- Emergency communication system: OnStar and GMC connected services capable
- Front beverage holders
- Front dual zone A/C
- Garage door transmitter
- Heated steering wheel
- Illuminated entry
- Memory seat
- Moonroof sunshade: manual
- 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
- Surround View Monitor: HD Surround Vision w/Hitch View yes
- Telescoping steering wheel
- Tilt steering wheel
- Transparent trailer view
- 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: 13.4"
- Smart device integration: Apple CarPlay/Android Auto
- Speaker type: Bose Performance Series
- Speakers: 12
- Steering wheel mounted audio controls
- Turn-by-turn navigation directions: OnStar Turn-by-Turn Navigation
- Wireless Phone Charger: front
- Wireless phone connectivity: Bluetooth
- Front center armrest
- Front seats: bucket
- Genuine wood dashboard insert
- Genuine wood door panel insert
- Heated front seats
- Heated rear seats
- Leather steering wheel
- Leather upholstery
- Massaging driver lumbar support
- Massaging passenger lumbar support
- Max seating capacity: 5
- 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
- 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: diesel
- Transmission: 10 speed automatic
- Ground clearance (min): 257mm (10.1")
- Auto-dimming door mirrors
- Bedliner
- Bumpers: body-color
- Door mirrors: chrome
- Heated door mirrors
- Hitch Class: IV
- Left rear passenger door: conventional
- Power door mirrors
- Rear cargo: tailgate
- Rear step bumper
- Right rear passenger: conventional
- Skid plates
- Trailer hitch
- Trailer sway control
- Turn signal indicator mirrors
- Engine displacement: 6.6 L
- Exterior body width: 2,079mm (81.8")
- Exterior height: 2,027mm (79.8")
- Exterior length: 6,369mm (250.8")
- 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: 1,019mm (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: 4,039mm (159.0")
- Appearance: digital/analog
- Auto high-beam headlights
- Blind spot: Trailer Side Blind Zone Alert warning
- Compass
- Configurable
- Delay-off headlights
- Exterior parking camera cargo
- Exterior parking camera front
- Exterior parking camera left
- Exterior parking camera rear: HD Rear Vision Camera w/Hitch View 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
- Rain sensing wipers
- 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
- Front pedestrian detection: prevention
- 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
- Gooseneck/5th Wheel Prep Package
- Technology Package
- Safety Alert Seat
- Rear Cross Traffic Alert
- Trailer Side Blind Zone Alert
- Wireless Phone Projection
- Bose Premium Series 12-Speaker System
- Floor-Mounted Center Console
- Electric Rear-Window Defogger
- Push Button Start
- Remote Vehicle Starter System
- GMC Connected Access Capable
- 120-Volt Instrument Panel Power Outlet
- 120-Volt Bed Mounted Power Outlet
- 2 Charge-Only Rear USB Ports
- 2 USB Ports
- 2 Charge/Data USB Ports Inside Center Console
- HD Surround Vision
- Heated 2nd Row Outboard Seats
- Deep-Tinted Glass
- Signature Denali Grille in Vadar Chrome
- Steering Wheel Audio Controls
- Manual Tilt-Wheel/Telescoping Steering Column
- LED Smoked Amber Roof Marker Lamps
- Power Sunroof
- LED Cargo Area Lighting
- Unauthorized Entry Theft-Deterrent System
- Universal Home Remote
- Wireless Charging
- Rear Wheelhouse Liners
- Front Rain-Sensing Wipers
- X31 Off-Road Package
- Integrated Trailer Brake Controller
- Trailer Tire Pressure Monitor Sensors
- 2-Speed Active Transfer Case
- Driver Memory
- Hill Descent Control
- Off-Road Suspension
- Multicolor 15" Diagonal Head-Up Display
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 2020–2026 models. | Privacy
- List Price
- $75,988
- You Save!
- -$1,100
- Darling's Price
- $74,888
- We're here to help: (207) 992-1535
- We're here to help: (207) 992-1535