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This 2026 GMC Sierra 2500HD AT4 Crew Cab 4WD is a purpose-built heavy-duty truck that blends premium refinement with serious off-road and towing capability. Finished in striking Coastal Dune with a distinctive Jet Black and Kalahari interior, this AT4 makes a bold statement while delivering the durability expected from a 2500HD.
Under the hood is the legendary 6.6L Duramax V8 Turbo Diesel, paired with a 10-speed automatic transmission, delivering immense torque for confident towing, hauling, and long-distance work. The factory gooseneck/5th-wheel prep package makes this truck fully ready for heavy trailers, while the AT4’s off-road-tuned hardware ensures stability and control in demanding conditions.
The AT4 trim brings a rugged yet upscale feel, highlighted by off-road suspension tuning, aggressive AT4 styling cues, and a commanding stance. This truck is equipped with power-retractable assist steps with LED lighting for easy entry, a power sunroof to open up the cabin, and LED roof marker lamps that reinforce its heavy-duty presence. Practical upgrades include a tri-fold hard tonneau cover, spray-in bed protection, moulded splash guards, and wheel locks.
Inside, the cabin is both functional and refined, featuring premium AT4-exclusive upholstery, heated front seats, a power sliding rear window, universal home remote, and removable all-weather floor liners with carpet inserts for year-round usability. Modern connectivity and convenience are enhanced with SiriusXM capability, intuitive infotainment, and thoughtful storage throughout the crew cab.
This 2026 Sierra 2500HD AT4 is the ideal choice for drivers who need uncompromising diesel power and towing confidence, but still want comfort, technology, and off-road attitude in a premium heavy-duty package.
Bed View Camera with Two Trailer Camera Provisions Includes camera in the CHMSL to show a view of the cargo bed, display located in infotainment screen.
2 Charge-Only Rear USB Ports
Wheels: 20" High Gloss Black 8 Spokes Aluminum (50.8 cm).
OnStar Services Capable See onstar.ca for details and limitations. Services vary by model. Service plan required.
Gloss Black Header Grille and Grille Insert Bars Includes black chrome accents.
Wireless Phone Projection For Apple CarPlay and Android Auto.
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.
Trailer Cam Provisions and Trailer Viewing Software
Ventilated Driver and Front Passenger Seats
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.
Safety Alert Seat
3.73 Rear Axle Ratio
Heated 2nd Row Outboard Seats
Spray-on Pickup Bedliner with GMC Logo Does not include spray-on liner on tailgate due to black composite inner panel.
2-Speed Active Transfer Case Electronic Autotrac with push button control.
Sierra HD Pro Safety Automatic Emergency Braking 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. Following Distance Indicator Forward Collision Alert Front Pedestrian Braking IntelliBeam Automatic High Beam on/Off Lane Departure Warning
Electric Rear-Window Defogger
LED Cargo Area Lighting Located in cargo bed activated with switch on centre switch bank or key fob.
Front Rain-Sensing Wipers
120-Volt Bed Mounted Power Outlet 400 watts shared with (KI4) instrument panel mounted power outlet.
Rear Premium Floor Liners with Removable Carpet Insert
120-Volt Instrument Panel Power Outlet 400 watts shared with (KC9) bed mounted power outlet.
Heated Driver and Front Outboard Passenger Seats
2 Charge/Data USB Ports Inside Centre Console
Bose Premium 7-Speaker Sound System Includes Richbass woofer.
Power Front Passenger Windows with Express Up/Down
Push Button Start
Manual Tilt-Wheel/Telescoping Steering Column
Trailer Side Blind Zone Alert
Front Bucket Seats 10-Way Power Driver Seat Adjuster with Lumbar 10-Way Power Passenger Seat Adjuster with Lumbar Driver Memory Recalls driver presets for power driver seat and outside mirrors.
Wireless Charging
2 USB Ports Located on 1st row console.
Transmission: 10-Speed Automatic
Unauthorized Entry Theft-Deterrent System
Steering Wheel Audio Controls
Deep-Tinted Glass
Ultrasonic Front and Rear Park Assist
Floor-Mounted Centre Console Includes cup holders, cell phone storage, power cord management and hanging file folder capability.
Rear Wheelhouse Liners
Tires: LT275/65R20 AT BW LT275/70R18 AT BW Spare Tire
Keyless Open and Start Includes remote keyless entry.
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.
Rear Cross Traffic Alert
Front Premium Floor Liners with Removable Carpet Insert
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 con
* 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.