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This 2026 GMC Sierra 2500 AT4 Crew Cab 4WD is a purpose-built heavy-duty truck that blends serious off-road capability with premium refinement. Finished in Onyx Black with a Jet Black and Kalahari interior, the AT4 stands out with its aggressive stance, rugged hardware, and upscale cabin designed for drivers who demand more from their HD truck.
Under the hood is the proven 6.6L Duramax turbo-diesel V8, paired with a 10-speed automatic transmission, delivering exceptional torque, confident towing capability, and long-distance efficiency. The AT4-specific suspension, off-road tuning, and high-clearance steps provide added confidence whether navigating rough terrain, job sites, or winter conditions. This truck is also equipped with snow plow prep and gooseneck / 5th wheel prep, making it exceptionally well-suited for serious work and trailering.
Inside, the AT4 Premium Plus Package elevates the driving experience with a multicolor 15-inch head-up display, rear camera mirror, power sunroof, power sliding rear window, universal home remote, and LED roof marker lamps. The cabin delivers both comfort and durability, with premium materials, thoughtful storage, and intuitive technology designed for long days behind the wheel.
With its commanding Duramax powertrain, off-road-ready AT4 hardware, advanced trailering capability, and premium interior features, this 2026 Sierra 2500 AT4 is an ideal choice for drivers who need uncompromising heavy-duty performance without sacrificing comfort or style.
ProGrade Trailering System Hitch Guidance with Hitch View Includes image adjustment and pan/zoom/tilt. in-Vehicle Trailering System App 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 monitoring sensors are installed.
Ultrasonic Front and Rear Park Assist
Bose Premium 7-Speaker Sound System Includes Richbass woofer.
Radio: AM/FM Stereo with Premium GMC Infotainment System Includes 13.4" diagonal multicolour touch-screen, Google built in apps such as navigation and voice assistance, multi-touch display, Bluetooth streaming audio for music and most phones; featuring wireless Android Auto and Apple CarPlay capability for compatible phones.
Steering Wheel Audio Controls
Remote Vehicle Starter System
Front Rain-Sensing Wipers
Rear Premium Floor Liners with Removable Carpet Insert
Tires: LT275/65R20 AT BW LT275/70R18 AT BW Spare Tire
120-Volt Bed Mounted Power Outlet 400 watts shared with (KI4) instrument panel mounted power outlet.
2 Charge-Only Rear USB Ports
Spray-on Pickup Bedliner with GMC Logo Does not include spray-on liner on tailgate due to black composite inner panel.
OnStar Services Capable See onstar.ca for details and limitations. Services vary by model. Service plan required.
Safety Alert Seat
120-Volt Instrument Panel Power Outlet 400 watts shared with (KC9) bed mounted power outlet.
Wireless Phone Projection For Apple CarPlay and Android Auto.
Rear Wheelhouse Liners
Ventilated Driver and Front Passenger Seats
Transmission: 10-Speed Automatic
Unauthorized Entry Theft-Deterrent System
LED Cargo Area Lighting Located in cargo bed activated with switch on centre switch bank or key fob.
3.73 Rear Axle Ratio
2 Charge/Data USB Ports Inside Centre Console
Deep-Tinted Glass
Wireless Charging
Gloss Black Header Grille and Grille Insert Bars Includes black chrome accents.
Rear Cross Traffic Alert
Trailer Cam Provisions and Trailer Viewing Software
2 USB Ports Located on 1st row console.
Front Premium Floor Liners with Removable Carpet Insert
Trailer Side Blind Zone Alert
Manual Tilt-Wheel/Telescoping Steering Column
Floor-Mounted Centre Console Includes cup holders, cell phone storage, power cord management and hanging file folder capability.
Push Button Start
Perforated Leather-Appointed Front Seat Trim
X31 Off-Road Package Includes twin-tube Rancho shocks.Hill Descent Control Off-Road Suspension Includes twin-tube shocks. Skid Plates Protect the oil pan, front axle and transfer case.
Keyless Open and Start Includes remote keyless entry.
Electric Rear-Window Defogger
Wheels: 20" High Gloss Black 8 Spokes Aluminum (50.8 cm).
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.
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 wil
* Every reasonable effort is made to ensure the accuracy of the information listed above. Vehicle pricing, incentives, options (including standard equipment), and technical specifications listed is for the 2026GMCSierra 2500HD AT4 4x4 Crew Cab 6.75 ft. box may not match the exact vehicle displayed. Please confirm with a sales representative the accuracy of this information.
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Stackable vs Non-Stackable: Stackable incentives are discounts that can be combined with cash, finance and/or lease rates should you qualify for them. Please contact a sales representative for more information.