2026 GMC Sierra 2500HD for sale. Serving Winnipeg and rural Manitoba with Buick and GMC sales and service. 1GT1UPEY4TF431572 - Jim Gauthier Buick GMC.

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [0]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [1]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [2]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [3]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [4]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [5]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [6]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [7]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [8]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [9]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [10]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [11]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [12]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [13]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [14]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [15]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [16]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [17]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [18]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [19]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [20]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [21]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [22]

2026 GMC Sierra 2500HD AT4 | Diesel 4WD Crew Cab 159″ AT4 Turbocharged Diesel V8 6.6L/ [23]

Details

Exterior Color: Onyx Black
Interior Color: Jet Black with Kalahari accents
Body Style: Pickup
Transmission: 10-Speed Automatic

Stock: T261283
VIN: 1GT1UPEY4TF431572
Mileage: 7
Engine: Turbocharged Diesel V8 6.6L/
City MPG:
Highway MPG:

Highlights

4 wheel Drive
4 wheel Drive
Anti Lock Braking System
Anti Lock Braking System
Power Seat(s)
Power Seat(s)
Heated Seats
Heated Seats
Steering Wheel Controls
Steering Wheel Controls
Remote Start
Remote Start
Cruise Control
Cruise Control
Backup Camera / Assist
Backup Camera / Assist
Cross-Traffic Alert
Cross-Traffic Alert
Blind Spot Monitor
Blind Spot Monitor
Multi-Zone A/C
Multi-Zone A/C
Keyless Entry
Keyless Entry
Navigation
Navigation
Premium Sound
Premium Sound
Satellite Radio
Satellite Radio
Rain Sensing Wipers
Rain Sensing Wipers
Bluetooth
Bluetooth
Bed Liner
Bed Liner
Back-Up Camera
Back-Up Camera
Keyless Start
Keyless Start
Cooled Seat(s)
Cooled Seat(s)
Power Folding Mirrors
Power Folding Mirrors
Lane Departure Warning
Lane Departure Warning
Wifi
Wifi
Adaptive Cruise
Adaptive Cruise
Smartphone Integration
Smartphone Integration
Android Auto
Android Auto
Apple Carplay
Apple Carplay

Overview

This brand-new 2026 GMC Sierra 2500HD AT4 is a powerful diesel truck built to handle serious work and long hauls. The 6.6-litre diesel engine delivers the efficiency and torque that heavy-duty truck owners depend on, while the 4x4 drivetrain provides confident traction and control in demanding conditions. The AT4 trim brings a refined approach to truck capability, combining rugged engineering with genuine comfort features that make everyday driving and longer trips more enjoyable. The Sierra 2500HD AT4 is well-equipped with technology that makes ownership easier. Adaptive cruise control helps reduce fatigue on highway drives, while lane departure warning adds a layer of driving awareness. Heated steering wheel keeps your hands comfortable, and the navigation system takes the guesswork out of finding your way. Parking assist rear sensors make backing up simpler, especially when you are working with a full load or navigating tight spaces. Automatic climate control maintains cabin comfort no matter the season. *Key Features* * *Trim & Packages:* AT4 trim with diesel capability and 4x4 drivetrain. AT4 Preferred Package Universal Home Remote, rear sliding power window and Roof Marker Lamps. Technology Package includes Rear Camera Mirror and Multicolour 15-inch Diagonal Head-Up Display. Gooseneck / 5th Wheel Prep Package * *Performance & Capability:* 6.6L diesel engine with automatic transmission for efficient power and towing readiness * *Driver Assistance & Safety:* Adaptive cruise control, lane departure warning, and rear parking sensors for confident operation * *Comfort & Convenience:* Heated steering wheel, navigation system, and automatic climate control * *Entertainment & Media:* Steering wheel audio controls for easy access to music and calls Contact Gauthier Cadillac Buick GMC to arrange a test drive or learn more about this new Sierra 2500HD AT4.

Options

Interior

Adaptive Cruise Control
Air vents, rear
Audio System, 13.4" diagonal Premium GMC Infotainment System with Google built in apps such as navigation and voice assistance includes colour touch-screen, multi-touch display, AM/FM stereo, Bluetooth streaming audio for music and most phones; featuring wireless Android Auto and Apple CarPlay capability for compatible phones
Bose Sound System, premium 7-speaker system with Richbass woofer
Compass, located in instrument cluster
Door locks, power
Driver memory recalls driver "presets" for power driver seat and outside mirrors
Floor covering, colour-keyed carpeting
Keyless Open and Start includes remote keyless entry
Power outlet, bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet)
Premium Floor Liners with removable carpet insert, front
Rear Seat Reminder
Seat adjuster, driver 10-way power including lumbar
Seat trim, Perforated front Leather
Seating, heated driver and front outboard passenger
Seats, heated second row outboard seats
SiriusXM Trial Subscription
Steering column, manual Tilt-Wheel and telescoping
Steering wheel, heated
Theft-deterrent system, unauthorized entry
USB Ports, 2 (first row) located on console
Wi-Fi Hotspot capable (Terms and limitations apply. See onstar.ca or dealer for details.)
Windows, power front, drivers express up/down
Wireless Charging

Air conditioning, dual-zone automatic climate control
Assist handles front A-pillar mounted for driver and passenger, rear B-pillar mounted
Bluetooth for phone connectivity to vehicle infotainment system
Centre Console, floor-mounted with cup holders, cell phone storage, power cord management, hanging file folder capability
Defogger, rear-window electric
Driver Information Centre, enhanced, 12.3" diagonal reconfigurable multicolour digital display
Exterior Temperature Display, located in radio display
GMC Premium information Display- 13.4" diagonal Multicolour touch screen
Mirror, inside rearview auto-dimming
Power outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)
Premium Floor Liners with removable carpet insert, rear
Remote vehicle starter system
Seat adjuster, passenger 10-way power including lumbar
Seat, Up-level Rear with Storage Package 60/40 folding bench for Crew Cab models, includes full-length bench seat, seatback storage on left and right side, centre fold out armrest with 2 cupholders, full cab width under-seat storage, (includes child seat top tether anchor)
Seats, front bucket with centre console
Seats, ventilated driver and front passenger
SiriusXM with 360L Trial Subscription. SiriusXM with 360L transforms your customers' ride with our most extensive and personalized radio experience on the road. (IMPORTANT: The SiriusXM trial subscription is not provided on vehicles that are ordered for Fleet Daily Rental ("FDR") use. Certain features and/or content may not be available unless an active data connection is enabled in the vehicle. Content varies by SiriusXM subscription plan. Features and display may vary by vehicle. All SiriusXM services require a subscription, sold separately by SiriusXM after the trial period. Your SiriusXM service will automatically stop at the end of your trial unless you decide to subscribe. If you decide to continue service after your trial, the subscription plan you choose will continue for an indeterminate term and you will be charged according to your chosen payment method at the then current rates unless and until you cancel. Taxes apply. Please see the SiriusXM Customer Agreement at siriusxm.ca/terms for complete terms and how to cancel, which includes calling SiriusXM at 1-888-539-7474. All rates, content, and programming are subject to change. SiriusXM uses personal information in accordance with SiriusXM Privacy Policy, available at siriusxm.ca/privacy. SiriusXM Canada Inc. "SiriusXM", the SiriusXM logo, channel names and logos are trademarks of Sirius XM Radio Inc. and are used under license.)
Steering wheel audio controls
Steering wheel, wrapped
USB ports, (2) charge-only, rear
USB Ports, 2, Charge/Data ports located inside centre console
Window, power front, passenger express up/down
Windows, power rear, express down
Wireless phone projection for Apple CarPlay and Android Auto

Mechanical

Air filter, heavy-duty
Alternator, 170 amps (Requires (L8T) 6.6L V8 gas engine.)
Battery, heavy-duty 720 cold-cranking amps/80 Amp-hr maintenance-free with rundown protection and retained accessory power (Included and only available with (L8T) 6.6L V8 gas engine.)
Brakes, 4-wheel antilock, 4-wheel disc with DURALIFE rotors
Cooling, auxiliary external transmission oil cooler
Four wheel drive
GVWR, 10,850 lbs. (4921 kg) (Included and only available with TK20743 model and (L8T) 6.6L V8 gas engine with 18", 20" or 22" wheels.)
In-Vehicle Trailering App, System includes checklist, trailer maintenance reminders, trailer security alerts, trailer mileage, tow/haul reminder, trailer electrical diagnostics and Trailer Tire Pressure Monitor System module (Includes trailer tire pressure monitoring alert when (PTT) trailer tire pressure monitor sensors are installed.)
Push Button Start
Recovery hooks, Red
Steering, Digital Variable Steering Assist this system automatically adjusts steering based on speed, road conditions, and other inputs to reduce driver effort and fatigue
Trailer brake controller, integrated

Air filtration monitoring
Auto-locking rear differential
Brake lining wear indicator
Capless Fuel Fill (Requires (L8T) 6.6L gas V8 engine.)
Cooling, external engine oil cooler
Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section
Hill Descent Control
Pickup bed includes bed assist step
Rear axle, 3.73 ratio (Requires (L8T) 6.6L V8 gas engine.)
Skid Plates protect the oil pan, front axle and transfer case
Suspension, Off-Road includes twin-tube shocks
Transfer case, two-speed active, electronic Autotrac with push button control

Safety

Airbags, Dual-stage frontal airbags for driver and front outboard passenger; Seat-mounted side-impact airbags for driver and front outboard passenger; Head-curtain airbags for front and rear outboard seating positions; Includes front outboard Passenger Sensing System for frontal outboard passenger airbag
Bed View Camera, camera in the CHMSL to show a view of the cargo bed display located in infotainment screen, includes Two Trailer Camera Provisions
Daytime Running Lamps, LED signature lighting
Forward Collision Alert (Included and only available with (PDI) Sierra HD Pro Safety.)
Front Pedestrian Braking (Included and only available with (PDI) Sierra HD Pro Safety.)
Hitch Guidance dynamic single line to aid in truck trailer alignment for hitching
Lane Departure Warning (Included and only available with (PDI) Sierra HD Pro Safety.)
OnStar Basics (OnStar Fleet Basics for Fleet) Drive more confidently with up to 8 years of core OnStar services including mobile app commands, connectivity for select apps that provide in-vehicle voice assistance and navigation with real-time traffic, and Automatic Crash Response. (Requires (UE1) OnStar. Term begins on vehicle delivery date. Paid subscription required after expiry. Services are dependent on compatible wireless networks provided by third-party wireless service providers, working vehicle electrical systems, GPS signal and other factors outside GM control. Changes in technology and wireless networks may limit or prevent the operation of certain services. Services, connectivity, and capabilities have additional terms and limitations and are subject to change, and will vary by model, vehicle configuration, software version, conditions, and geographical and technical restrictions. Compatible smartphone required for mobile app commands. Not all vehicles may transmit all crash data; OnStar links to emergency services; Voice and Maps apps are subject to change at any time and may be provided by third parties. Non-refundable and no cash value. See onstar.ca/en/info for terms and details.)
Rear Cross Traffic Alert
Safety Alert Seat
StabiliTrak, stability control system with Proactive Roll Avoidance and traction control, includes electronic trailer sway control and hill start assist
Tire Pressure Monitoring System, auto learn includes Tire Fill Alert (does not apply to spare tire)
Trailer Side Blind Zone Alert

Automatic Emergency Braking (Included and only available with (PDI) Sierra HD Pro Safety.)
Buckle to Drive prevents vehicle from being shifted out of Park until driver seat belt is fastened; times out after 20 seconds and encourages seat belt use (Included and only available with (PDI) Sierra HD Pro Safety.)
Following Distance Indicator (Included and only available with (PDI) Sierra HD Pro Safety.)
Front and Rear Park Assist, ultrasonic
HD Surround Vision provides the driver with an overhead view of the scene around the vehicle on a centre stack display. Includes front camera washer.
Hitch Guidance with Hitch View with image adjustment, Pan/Zoom/Tilt
LED Signature DRL's
OnStar services capable (See onstar.ca for details and limitations. Services vary by model. Service plan required.)
Rear Seat Belt Indicator
Seat Belt Adjustable Guide Loops, front row only
Teen Driver a configurable feature that lets you activate customizable vehicle settings associated with a key fob, to help encourage safe driving behaviour. It can limit certain available vehicle features, and it prevents certain safety systems from being turned off. An in-vehicle report card gives you information on driving habits and helps you to continue to coach your new driver
Trailer Camera Provisions and trailer viewing software
Trailering Information Label provides max trailer ratings for tongue weight, conventional, gooseneck and 5th wheel trailering

Exterior

Bed Step, Black integrated on forward portion of bed on driver and passenger side
Bumper, front, body-colour lower
Cargo tie downs (12), fixed, rated at 500 lbs (226.8 kg) per corner
Door handles, body-colour
Glass, deep-tinted
Headlamps, Animated LED projectors LED turn signals and Daytime Running Lamps
Lamps, cargo area cab mounted integrated with centre high mount stop lamp, with switch in bank on left side of steering wheel
Mirror caps, high gloss Black
Mouldings, beltline, Black
Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light
Taillamps, Animated LED Signature Tail, Stop, turn and Reverse lamps
Tire, spare LT275/70R18 all-terrain, blackwall
Wheelhouse liners, rear
Wipers, front rain-sensing

Bedliner, Spray-on, Pickup bedliner with GMC logo (does not include spray-on liner on tailgate due to Black composite inner panel)
Bumper, rear body-colour with bumper CornerSteps
CornerStep, rear bumper
Fog lamps, LED
Grille (Gloss Black header and grille insert bars with Black Chrome accents.)
IntelliBeam, automatic high beam on/off (Included and only available with (PDI) Sierra HD Pro Safety.)
LED Cargo Area Lighting located in cargo bed activated with switch on centre switch bank or key fob
Mirrors, outside power-adjustable vertical trailering with heated and auto-dimming upper glass, (driver and passenger), lower convex mirrors, turn signal indicators, puddle lamps, (U12) perimeter lighting, auxiliary lighting, power folding/extending (extends 3.31" [84.25mm]) lighting
Tailgate and bed rail protection caps, top
Tailgate, GMC MultiPro Tailgate with six functional load/access features NOTE: Auto release can be disabled if ball hitch is installed. See Owner's manual for details
Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door
Tires, LT275/65R20 all-terrain, blackwall
Wheels, 20" (50.8 cm) High Gloss black aluminum wheels 8 spokes

Package

X31 Off-Road Package includes (JHD) Hill Descent Control, (NZZ) skid plates, Off-Road suspension and Twin-tube Rancho shocks

ProGrade Trailering System includes (PZ8) Hitch Guidance with Hitch View and (UET) In-vehicle Trailering App

Disclaimer

Pricing shown does not include taxes, including sales taxes or luxury taxes (where applicable). Prices represent the selling price minus current incentives and include air conditioning charge, freight, tire levy (where applicable), dealer-installed options, accessories, pre-delivery, administration charges and other retailer charges and exclude taxes, license and insurance. All prices are in Canadian Dollars unless otherwise stated and all financing is OAC. Please contact the dealership for more information.

Every effort is made to ensure the accuracy of the content. In the event of a discrepancy, error and/or omission or vehicle prices, please contact the dealership to confirm all information and pricing.

In the event of a discrepancy, error and/or omission or vehicle prices, please contact the dealership to confirm all information and pricing.

Effective September 1st, 2022, vehicles sold in Canada above $100,000 pre-tax retail price may be subject to a luxury tax of either 20% on the amount above $100,000 or a flat 10% on the full value. This tax is in addition to the Provincial Sales Tax (PST) and the Goods and Services Tax (GST). For official information, refer to the Government of Canada website.

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