The 2026 GMC Sierra 2500HD AT4X Crew Cab Standard Box 4WD represents the highest level of heavy-duty capability, combining professional-grade strength with premium refinement and advanced off-road engineering. Designed for drivers who demand extreme towing power, rugged trail performance, and first-class comfort, the AT4X delivers confidence in every environment, from the worksite to the wilderness. 

Performance & Capability  

Engine: 6.6L Duramax Turbo-Diesel V8 delivering massive torque, impressive pulling power, and dependable performance for demanding towing and hauling situations  

Transmission: Allison 10-Speed Automatic transmission provides smooth gear changes, optimized power delivery, and enhanced control when towing heavy loads 

Drivetrain: Autotrac Two-Speed 4-Wheel Drive system provides selectable traction control for changing road conditions, off-road trails, snow, mud, and uneven terrain  

AT4X Off-Road Suspension: Specialized suspension tuning designed to improve articulation, stability, and control while navigating challenging landscapes  

Electronic Locking Rear Differential: Delivers additional traction by distributing power to both rear wheels when conditions become difficult  

Hill Descent Control: Helps maintain a controlled speed during steep downhill descents for confident off-road driving  

Heavy-Duty Engineering: Equipped with engine exhaust braking, heavy-duty air filtration, engine oil cooling, transmission cooling, and a high-output alternator to support demanding workloads  

Axle Ratio: 3.42 rear axle ratio optimized for strong acceleration, towing capability, and confident highway performance  

Trailering Technology: Integrated trailer brake controller, Hitch Guidance with Hitch View, Trailer Camera Provisions, Gooseneck/5th Wheel Prep Package, and GMC Trailering App help simplify hookup, monitoring, and towing management  

 

Winter & Weather Comfort  

Heated & Ventilated Front Seats: Provide customized comfort by keeping occupants warm in cold weather and cool during warmer conditions  

Heated Rear Seats & Heated Steering Wheel: Adds premium comfort for passengers and improves cold-weather convenience  

Remote Vehicle Start: Allows the cabin to be pre-conditioned before entering the vehicle  

Dual-Zone Automatic Climate Control: Maintains separate temperature settings for driver and front passenger comfort  

Engine Block Heater: Helps improve cold-weather starting performance in harsh winter conditions  

Rain-Sensing Wipers: Automatically adjust wiping speed based on rainfall intensity  

Premium Floor Protection: All-weather floor liners help protect the interior from snow, mud, water, and debris  

 

Interior Comfort & Convenience  

Premium Front Bucket Seats: Power-adjustable seating provides personalized comfort for long drives and demanding workdays  

Driver Memory Settings: Saves preferred seat and mirror positions for multiple drivers  

Massage Front Seats: Adds relaxation and reduces fatigue during extended trips  

Power Sliding Rear Window: Provides additional airflow and convenience with the touch of a button  

Rear Seat Storage Package: Creates practical storage solutions for tools, gear, and everyday essentials  

Wireless Charging Pad & USB Connectivity: Keeps compatible devices powered without unnecessary cables  

120V Power Outlets: Provides household-style power inside the cabin and in the truck bed for tools, accessories, and equipment  

Power Sunroof: Adds an open-air feeling and enhances the premium cabin atmosphere  

Rear Camera Mirror: Improves rear visibility by providing a wider view compared to a traditional mirror  

 

Technology & Connectivity  

13.4 GMC Premium Infotainment System: Features a large touchscreen interface with Google Built-In services for navigation, apps, and vehicle controls  

Wireless Apple CarPlay & Android Auto: Seamlessly connects smartphones for hands-free access to calls, music, messages, and navigation  

12 Digital Driver Display: Provides customizable vehicle information, driving data, and important alerts directly in front of the driver  

Head-Up Display: Projects key driving information onto the windshield to help keep the drivers focus on the road  

Bose Premium Audio System: Delivers a rich listening experience throughout the cabin  

Wi-Fi Hotspot Capability: Helps keep passengers connected while traveling  

 

Safety & Driver Assistance  

GMC Pro Safety Suite: Provides advanced driver assistance features designed to increase awareness and confidence behind the wheel  

Adaptive Cruise Control: Helps maintain a set following distance during highway driving  

Forward Collision Alert & Automatic Emergency Braking: Helps detect potential frontal collisions and can assist in reducing impact severity  

Trailer Side Blind Zone Alert: Extends blind-zone monitoring when towing a trailer  

HD Surround Vision: Provides multiple camera views to improve parking, maneuvering, and trailering visibility  

Bed View Camera: Allows drivers to monitor cargo and hitch areas with improved visibility  

Driver Safety Alert Seat: Provides directional seat vibrations to warn the driver of potential hazards  

 

Exterior Styling & Utility  

Exterior Colour: Coastal Dune a bold, premium finish that complements the AT4Xs rugged design and off-road character  

18 Aluminum Wheels with Mud-Terrain Tires: Built for durability and traction on dirt, gravel, snow, and challenging terrain  

LED Lighting Package: Includes LED headlamps, fog lamps, cargo lighting, and roof marker lamps for excellent visibility day or night  

Power-Retractable Assist Steps: Provide easy cabin access while adding rugged styling with integrated LED lighting  

GMC MultiPro Tailgate: Offers multiple configurations for loading, hauling, accessing cargo, and improving worksite functionality  

Spray-On Bedliner: Protects the cargo box from scratches, impacts, and daily use  

Trailering Mirrors: Heated, power-adjustable mirrors with auto-dimming and integrated task lighting for improved towing visibility  

Red Front Recovery Hooks: Provide a durable recovery point for off-road situations  

AT4X Styling Elements: Aggressive design details, rugged accents, and premium finishes create a commanding road presence  

 

The 2026 GMC Sierra 2500HD AT4X is built for those who expect more from a heavy-duty truck. With extreme Duramax diesel capability, advanced trail technology, luxurious comfort, and bold AT4X styling, it delivers the confidence to tow, explore, and take on any challenge with uncompromising performance. 

 



AMVIC Licensed Dealer

*Every reasonable effort is made to ensure the accuracy of the information shown. The Standard Equipment listed is provided at the time of the manufacture and may not match the exact vehicle displayed. Please confirm with a sales representative the accuracy of this information.

Safety EquipmentAirbags, 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 airbagFront and Rear Park Assist, ultrasonicRear Cross Traffic AlertTeen 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 driverStabiliTrak, stability control system with Proactive Roll Avoidance and traction control, includes electronic trailer sway control and hill start assistDaytime Running Lamps, LED signature lightingHitch Guidance dynamic single line to aid in truck trailer alignment for hitchingRear Seat Belt IndicatorTire Pressure Monitoring System, auto learn includes Tire Fill Alert (does not apply to spare tire)Safety Alert SeatTrailer Side Blind Zone AlertHitch Guidance with Hitch View with image adjustment, Pan/Zoom/TiltFront Pedestrian Braking (Included and only available with (PDI) Sierra HD Pro Safety.)Automatic Emergency Braking (Included and only available with (PDI) Sierra HD Pro Safety.)LED Signature DRL'sHD Surround Vision provides the driver with an overhead view of the scene around the vehicle on a centre stack display. Includes front camera washer.Bed View Camera, camera in the CHMSL to show a view of the cargo bed display located in infotainment screen, includes Two Trailer Camera ProvisionsTrailer Camera Provisions and trailer viewing softwareForward Collision Alert (Included and only available with (PDI) Sierra HD Pro Safety.)Following Distance Indicator (Included and only available with (PDI) Sierra HD Pro Safety.)Lane Departure Warning (Included and only available with (PDI) Sierra HD Pro Safety.)Seat Belt Adjustable Guide Loops, front row onlyBuckle 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.)Trailering Information Label provides max trailer ratings for tongue weight, conventional, gooseneck and 5th wheel traileringOnStar Services capable (See onstar.ca for details and limitations. Services vary by model. Service plan required.)Trailer Tire Pressure Monitor Sensors includes set of 4 sensors. Sensor functionality requires (UET) In-Vehicle Trailering App to be ordered with the vehicle and installed by the factory. Sensors will be shipped loose with the truck and will need to be installed on trailer by customer. System is capable of monitoring up to 6 wheels. Additional or replacement sensors are available through GM AccessoriesOnStar 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.)Interior EquipmentSeating, heated driver and front outboard passengerSeats, ventilated driver and front passengerSeats, heated second row outboard seatsCentre Console, floor-mounted with cup holders, cell phone storage, power cord management, hanging file folder capabilityFloor covering, colour-keyed carpetingSteering wheel, leather-wrappedSteering wheel, heatedSteering wheel audio controlsCompass, located in instrument clusterWindow, power front, passenger express up/downWindows, power rear, express downDoor locks, powerRemote vehicle starter systemUniversal Home RemoteTheft-deterrent system, unauthorized entryPower outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)Power outlet, bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet)Defogger, rear-window electricAssist handles front A-pillar mounted for driver and passenger, rear B-pillar mountedAir conditioning, dual-zone automatic climate controlExterior Temperature Display, located in radio displaySteering column, manual Tilt-Wheel and telescopingRear Seat ReminderAdaptive Cruise ControlWireless ChargingUSB Ports, 2 (first row) located on consoleAir vents, rearDriver Information Centre, enhanced, 12.3" diagonal reconfigurable multicolour digital displayWindows, power front, drivers express up/downDriver memory recalls driver "presets" for power driver seat and outside mirrorsWindow, power, rear sliding with rear defoggerUSB Ports, 2, Charge/Data ports located inside centre consoleSeats, front bucket with centre consoleSeat, 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)Premium Floor Liners with removable carpet insert, frontPremium Floor Liners with removable carpet insert, rearGMC Premium information Display- 13.4" diagonal Multicolour touch screenKeyless Open and Start includes remote keyless entryUSB ports, (2) charge-only, rearRear Camera Mirror inside rearview auto-dimming with full camera displaySeat adjuster, driver 16-way power including lumbar and massageSeat adjuster, passenger 16-way power including lumbar and massageMulticolour 15" Diagonal Head-Up DisplaySeat trim, Full Grain LeatherExterior EquipmentTire carrier lock keyed cylinder lock that utilizes same key as ignition and doorCargo tie downs (12), fixed, rated at 500 lbs (226.8 kg) per cornerLamps, cargo area cab mounted integrated with centre high mount stop lamp, with switch in bank on left side of steering wheelGlass, deep-tintedTailgate and bed rail protection caps, topMouldings, beltline, BlackMirror caps, high gloss BlackWheelhouse liners, rearWipers, front rain-sensingFog lamps, LEDBed Step, Black integrated on forward portion of bed on driver and passenger sideHeadlamps, Animated LED projectors LED turn signals and Daytime Running LampsIntelliBeam, 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 fobTaillamps, Animated LED Signature Tail, Stop, turn and Reverse lampsMirrors, 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]) lightingTailgate, 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 detailsTailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area lightSunroof, powerWheels, 18" (45.7 cm) machined aluminum wheel with High Gloss black accentsTires, LT305/70R18-126/123R, 35" M/TTire, spare, LT305/70R18-126/123R, 35" M/TWheel, Spare 18" (50.8 cm)Assist steps, power retractable, Black includes LED lighting (Not available with any other assist steps.)CornerStep, rear bumper (Not available with (ULV) AT4X AEV Edition.)Grille (Gloss Black header and grille insert bars with Dark Nickel inserts.)Lamps, Smoked Amber roof marker, (LED)Door handles, body-colour (With (ULV) AT4X AEV Edition door handles will be Gloss black.)Bedliner, Spray-on, Pickup bedliner with GMC logo (does not include spray-on liner on tailgate due to Black composite inner panel)Bumper, front, body-colour lower (Bumper color will be High Gloss Black.)Bumper, rear body-colour with bumper CornerSteps (Bumper color will be High Gloss Black.)Entertainment EquipmentBluetooth for phone connectivity to vehicle infotainment systemWi-Fi Hotspot capable (Terms and limitations apply. See onstar.ca or dealer for details.)Wireless phone projection for Apple CarPlay and Android AutoAudio 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 phonesBose Premium Series with 12-speaker system with Centerpoint Richbass woofer and AudioPilotLPO, MultiPro Tailgate Audio System by KickerSiriusXM Trial SubscriptionSiriusXM 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.)Mechanical EquipmentEngine, 6.6L V8 with Direct Injection and Variable Valve Timing, gasoline (401 hp [299 kW] @ 5200 rpm, 464 lb-ft of torque [629 N-m] @ 4000 rpm)Air filtration monitoringFour wheel driveCooling, external engine oil coolerCooling, auxiliary external transmission oil coolerBattery, 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.)Alternator, 170 amps (Requires (L8T) 6.6L V8 gas engine.)Trailer brake controller, integratedFrame, fully-boxed, hydroformed front section and a fully-boxed stamped rear sectionSteering, Digital Variable Steering Assist this system automatically adjusts steering based on speed, road conditions, and other inputs to reduce driver effort and fatigueBrakes, 4-wheel antilock, 4-wheel disc with DURALIFE rotorsBrake lining wear indicatorRear axle, 3.73 ratio (Requires (L8T) 6.6L V8 gas engine.)Pickup bed includes bed assist stepPush Button StartAir filter, heavy-dutyHill Descent ControlTransfer case, two-speed active, electronic Autotrac with push button controlIn-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.)Capless Fuel Fill (Requires (L8T) 6.6L gas V8 engine.)Differential, driver-selectable full-locking rear, e-lockingRecovery hooks, Red (Deleted with (ULV) AT4X AEV Edition.)Skid Plates, front aluminumSkid Plates, Transfer case, steelSuspension, Off-Road Includes, 1.5" suspension lift: front suspension lift composed of: Control Arms, Ball Joints, Knuckles, DSSV Dampers, rear suspension lift composed of spacer block and DSSV Dampers and Half shafts w/ revised joints, 3-stage Leaf springs from 3500Transmission, 10-Speed automaticGVWR, 11,025 lbs. (5001 kg) (Included and only available with TK20743 model and (L8T) 6.6L V8 gas engine with 18", 20" or 22" wheels.)Other EquipmentTrailering Package includes trailer hitch, 7-pin and 4-pin connectors and (CTT) Hitch GuidanceSierra HD Pro Safety includes (UEU) Forward Collision Alert, (UE4) Following Distance Indicator, (UKJ) Front Pedestrian Braking, (TQ5) IntelliBeam, (UFL) Lane Departure Warning, (T8Z) Buckle to Drive and (UHY) Automatic Emergency BrakingProGrade Trailering System includes (PZ8) Hitch Guidance with Hitch View and (UET) In-vehicle Trailering App