2025 GMC SIERRA HEAVY DUTY

AT4 & AT4X

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Back-side view of a 2025 GMC Sierra HD AT4 truck driving through the desert.

AT4 STARTING AT:

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AVAILABLE TOW UP TO

9,661 KG (21,300 LBS.)†
BUILD & PRICE
VIEW INVENTORY

KEY FEATURES

EXCLUSIVE ON AT4X

FACTORY-INSTALLED 1.5" SUSPENSION LIFT

EXCLUSIVE ON AT4X

MULTIMATIC DSSV DAMPERS

STANDARD ON AT4

OFF-ROAD SUSPENSION WITH RANCHO® SHOCKS

EXCLUSIVE ON AT4X

35" GOODYEAR® TERRITORY MT TIRES

EXCLUSIVE ON AT4X

OBSIDIAN RUSH INTERIOR WITH FULL-GRAIN LEATHER SEATING

STANDARD ON AT4

13.4" DIAGONAL TOUCHSCREEN IS THE LARGEST IN ITS CLASS†

CURRENT OFFERS

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EXPLORE GMC SIERRA HD AT4 & AT4X TRIMS
2025 Sierra HD 2500 AT4 in Summit White.

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AT4 

STARTING AT:

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AVAILABLE TOW UP TO 9,661 KG (21,300 LBS.)†

KEY FEATURES:
  • Exclusive Jet Black interior with Kalahari accents, and heated and ventilated perforated front leather seating surfaces
  • Exclusive 20" gloss-black aluminum wheels with available BFGoodrich® off-road tires
  • Off-Road Suspension Package with twin-tube Rancho shocks and skid plates
  • Up to 14 available camera views† with HD Surround Vision†
  • Adaptive Cruise Control†

AVAILABLE FEATURES 
  • 15" diagonal Head-Up Display with off-road inclinometer
BUILD & PRICE
2025 Sierra HD 2500 AT4X in Volcanic Red Tintcoat.

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AT4X†

STARTING AT:

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AVAILABLE TOW UP TO 8,391 KG (18,500 LBS.)†

KEY FEATURES:
  • Factory-installed 1.5" suspension lift, Multimatic® DSSV dampers, rear electronic-locking differential, larger steel transfer case skid plate and front aluminum skid plate
  • 35" Goodyear Territory MT tires
  • 16-way heated and ventilated power front seats with massage feature
  • Obsidian Rush interior featuring full-grain leather seating with technical-grain leather accents and authentic Vanta Ash wood

AVAILABLE FEATURES 
  • AT4X AEV Edition featuring stamped steel bumpers, stamped steel skid plates, and 18" Salta gloss-black wheels
  • Duramax® 6.6L Turbo-Diesel V8 engine with Allison® 10-speed automatic transmission
BUILD & PRICE

AT4 COLOURS
BUILD & PRICE LOCATE A DEALER

CAPABILITY

Serious adventure-ready hardware meets premium on-road comfort and world-class towing power.
Front-side view of a 2025 GMC Sierra HD AT4 truck hauling a trailer through a rocky terrain at dusk.
Side view of a 2025 GMC Sierra HD AT4 truck hauling a small trailer through a rocky terrain.

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DURAMAX 6.6L TURBO-DIESEL V8 ENGINE

Sierra Heavy Duty’s available Duramax 6.6L Turbo-Diesel V8 engine features an efficient turbocharger and Allison 10-speed automatic transmission.

VIEW DETAILS

Close-up view of the Rancho Shocks underneath the 2025 GMC Sierra HD AT4 truck.

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AT4 OFF-ROAD READINESS

AT4 features an off-road suspension with twin-tube Rancho shocks, skid plates and Hill Descent Control, which uses antilock braking to help you maintain control.
Close-up view of the trailer hook attached to the 2025 GMC Sierra HD AT4 truck.

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AT4X OFF-ROAD READINESS

The AT4X is prepared for the challenges of the trail with ground clearance of 11.6 inches, an approach angle of 31.6 degrees and a 25.7-degree departure angle.
Close-up view of the Multimatic DSSV Dampers on the 2025 GMC Sierra HD AT4 truck.

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MULTIMATIC DSSV DAMPERS

Available AT4X-exclusive Multimatic DSSV dampers feature three separate spool valves to control damping and three connected chambers for fluid flow.
Close-up view of the Powertrain System underneath the 2025 GMC Sierra HD AT4 truck.

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REAR ELECTRONIC-LOCKING DIFFERENTIAL 

Tackle tough terrain with a rear electronic-locking differential on AT4X, which assures both wheels will spin together regardless of the amount of resistance to help keep traction in the rough backcountry.
Back-side view of a 2025 GMC Sierra HD AT4 hauling a large trailer on the road.

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PROGRADE® TRAILERING TECH

This advanced suite of available intelligent technologies helps streamline the hitching and towing process with integrated tools that help enhance your sense of confidence and visibility.

VIEW DETAILS

EXTERIOR

Boldly designed and ruggedly functional.
Front-side view of a 2025 GMC Sierra HD AT4 truck driving through the mountains.
A 2025 GMC Sierra HD AT4 truck hauling a trailer through the desert during dusk.

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AT4 GRILLE

Stand out with AT4’s bold front-facing exterior design and LED projector headlamps with animated sequences.
Close-up view of the "HD" Badging and tires on the 2025 GMC Sierra HD AT4 truck.

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AT4X EXTERIOR

Available 35" Goodyear Territory MT tires and a factory-installed 1.5" suspension lift on Sierra HD AT4X and AT4X AEV Edition provide serious traction and clearance.
Close-up view of the wheels on the 2025 GMC Sierra HD AT4 truck.

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20" AT4 WHEELS

Sierra HD AT4’s 20" gloss-black aluminum wheels with available BFGoodrich off-road tires are made for rough trails.
Close-up view of the truck bed on the 2025 GMC Sierra HD AT4 truck.

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SPRAY-ON BEDLINER

Help protect the bed and enhance its style with durable cargo bed protection featuring a GMC logo.
Close-up view of the running board on the 2025 GMC Sierra HD AT4 truck.

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POWER-RETRACTABLE ASSIST STEPS 

This available feature includes LED perimeter lighting to help illuminate the way as you enter or exit.

Denali Ultimate Shown.
Close-up view of a lowered MultiPro Tailgate on a 2025 GMC Sierra HD AT4 truck.

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SIX-FUNCTION MULTIPRO™ TAILGATE

The world’s first MultiPro Tailgate combines six convenient functions that help improve loading, unloading and accessing the cargo bed.

VIEW DETAILS

SIERRA HD AT4X AEV EDITION

Tame the untamed in the Sierra HD AT4X AEV Edition. Equipped by off-road recreational driving and overland adventure travel experts American Expedition Vehicles (AEV®), this off-road pickup is engineered for the roughest terrain.
Front-side view of a 2025 GMC Sierra HD AT4 truck parked in front of snow-covered mountains.
Close-up view of the "AEV" badging on the back of a 2025 GMC Sierra HD AT4X AEV truck.

AEV STAMPED-STEEL BUMPERS

AEV heavy-duty, stamped-steel, powder-coated front and rear bumpers offer added protection while summiting boulders and rough terrain.
Close-up of the wheel on a 2025 GMC Sierra HD AT4X AEV truck.

AEV 18" SALTA® WHEELS

AEV racing-inspired Salta wheels with a 16-spoke design add to the AEV Edition’s rugged good looks.

Available accessories shown.
Close-up view of the trailer hook on a 2025 GMC Sierra HD AT4 truck driving on a rugged terrain.

AEV STAMPED-STEEL SKID PLATES

Rugged underbody protection with stamped-steel skid plates helps keep vital components such as the steering gear and the transfer case protected from ruts, rocks, stumps and other challenges of the trail.
Close-up view of the "AEV" stitching on the seat of a 2025 GMC Sierra HD AT4X truck.

AEV EMBROIDERED FRONT HEAD RESTRAINTS

The heavy-duty off-road truck is accented with exclusive AEV embroidered badging on the front head restraints.
BUILD & PRICE
Close-up view of the "AEV" badging on the back of a 2025 GMC Sierra HD AT4X AEV truck.

AEV STAMPED-STEEL BUMPERS

AEV heavy-duty, stamped-steel, powder-coated front and rear bumpers offer added protection while summiting boulders and rough terrain.

Available accessories shown.
Close-up view of the trailer hook on a 2025 GMC Sierra HD AT4 truck driving on a rugged terrain.

AEV STAMPED-STEEL SKID PLATES

Rugged underbody protection with stamped-steel skid plates helps keep vital components such as the steering gear and the transfer case protected from ruts, rocks, stumps and other challenges of the trail.
Close-up of the wheel on a 2025 GMC Sierra HD AT4X AEV truck.

AEV 18" SALTA® WHEELS

AEV racing-inspired Salta wheels with a 16-spoke design add to the AEV Edition’s rugged good looks.
Close-up view of the "AEV" stitching on the seat of a 2025 GMC Sierra HD AT4X truck.

AEV EMBROIDERED FRONT HEAD RESTRAINTS

The heavy-duty off-road truck is accented with exclusive AEV embroidered badging on the front head restraints.
BUILD & PRICE

AT4X VS. AT4X AEV
Front-side view of a 2025 GMC Sierra HD AT4X AEV truck parked on a rocky terrain.

AT4X

GROUND CLEARANCE

11.6"

APPROACH ANGLE

31.6°

BREAKOVER ANGLE

21.2°

DEPARTURE ANGLE

25.7°
Front-side view of a 2025 GMC Sierra HD AT4 truck parked in front of snow-covered cliffs.

AT4X AEV

GROUND CLEARANCE

11.8"

APPROACH ANGLE

29.8°

BREAKOVER ANGLE

22.6°

DEPARTURE ANGLE

25.7°

INTERIOR

Take on the world in comfort and control. 
Wide view of the front interior in a 2025 GMC Sierra HD AT4 Truck parked by the cliffs.
Close-up view of the front interiors in a 2025 GMC Sierra HD AT4 Truck.

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AT4 INTERIOR

AT4’s Jet Black interior with Kalahari accents features heated and ventilated front seats with leather seating surfaces, and a wrapped heated steering wheel.
Close-up view of the front seats in a 2025 GMC Sierra HD AT4 Truck.

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AT4X EXCLUSIVE OBSIDIAN RUSH INTERIOR 

AT4X’s interior features authentic Vanta Ash wood, and seats include bold red and white double-needle stitching for athletic character.
Close-up view of the seat controls on the 2025 GMC Sierra HD AT4 Truck.

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16-WAY POWER FRONT SEATS

Experience serious comfort in Sierra HD AT4X’s best-in-class† 16-way power front seats with massaging feature.
Close-up view of the"AT4X" Branded Kickplate on the 2025 GMC Sierra HD AT4 Truck.

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PREMIUM ALL-WEATHER FLOOR LINERS 

Help protect your interior with available floor liners with removable carpet inserts.

TECHNOLOGY

Keep informed and in command.

AT4X shown.
Wide view of the Dashboard, Infotainment System, and Steering Wheel on the 2025 GMC Sierra HD AT4 Truck.

Available features shown. 
Close-up view of the infotainment system on the 2025 GMC Sierra HD AT4 Truck.

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13.4" DIAGONAL CENTRE TOUCHSCREEN

This tablet-style touchscreen — the largest in its class† — is the customizable, high-tech centrepiece of the cabin.

U.S. model with available Head-Up Display shown. 
Close-up of a person's hand on the steering wheel of the 2025 GMC Sierra HD AT4 Truck.

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12.3" DIAGONAL COLOUR DRIVER INFORMATION CENTRE

Control and customize important vehicle, driving and infotainment content.
Close-up view of the Heads Up Display Feature in use in the 2025 GMC Sierra HD AT4 Truck.

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MULTICOLOUR 15" DIAGONAL HEAD-UP DISPLAY

The available multicolour 15" diagonal Head-Up Display helps keep important information like speed and alerts in clear view.

VIEW DETAILS

Transparent Trailer View being displayed in the infotainment screen of the 2025 GMC Sierra HD AT4 Truck.

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UP TO 14 CAMERA VIEWS†

Get help seeing around your heavy duty off-road truck and compatible trailer with up to 14 available camera views,† including the industry-first available transparent trailer view.†

VIEW DETAILS

Close-up View of the Infotainment System with Android Auto in a 2025 GMC Sierra HD Truck.

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PREMIUM GMC INFOTAINMENT SYSTEM†

With available Google built-in compatibility† (subscription[s] required for full functionality), this system offers a helpful, personalized and seamless way to enhance the entertainment in your truck.
Close-up View of the Infotainment System with Apple Carplay in a 2025 GMC Sierra HD Truck.

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WIRELESS COMPATIBILITY

Connect your compatible smartphone to access a more integrated in-vehicle experience with Apple CarPlay®† or Android Auto™† compatibility.

SAFETY

2025 GMC Sierra HD AT4 Truck hauling a trailer through the desert.

SIERRA HD PRO SAFETY

Every Sierra Heavy Duty off-road work truck includes active safety and driver assistance technologies that help while driving and trailering. Sierra HD Pro Safety includes: 

Forward Collision Alert
Following Distance Indicator
Front Pedestrian Braking    
IntelliBeam

Lane Departure Warning
Automatic Emergency Braking
VIEW MORE SAFETY DETAILS

Safety or driver assistance features are no substitute for the driver’s responsibility to operate the vehicle in a safe manner. Read the vehicle Owner’s Manual for important feature limitations and information.

SPEC HIGHLIGHTS
  • 2500 HD AT4
  • 3500 HD AT4
  • 2500 HD AT4X
2024-sierra-hd-slt-2500-crew-cab-spec-v2.png

The Sierra 2500 HD AT4 pickup truck comes in a 4WD Crew Cab model with a 6' 9" standard bed or an available 8' long bed. 

MAX AVAILABLE CONVENTIONAL TRAILERING

9,071 KG (20,000 lbs.)†

MAX AVAILABLE GCWR

13,607 KG (30,000 lbs.)†

WHEELBASE

159.0"–172.0"

FRONT/REAR TREAD WIDTH
SRW:

68.4"/68.3"

MAX AVAILABLE GOOSENECK/FIFTH-WHEEL TRAILERING RATING

9,611 KG (21,190 lbs.)†

GROUND CLEARANCE

10.1"

CARGO VOLUME

69.5–83.5 cu. ft.†

MAX AVAILABLE PAYLOAD

1,659 KG (3,658 lbs.)†

VIEW DETAILED SPECS
2024-sierra-hd-slt-2500-double-cab-spec-v2.png

The Sierra 3500 Heavy Duty pickup truck comes in a 4WD Crew Cab model with a 6' 9" standard bed or an available 8' long bed. Single Rear Wheel only. 

MAX AVAILABLE CONVENTIONAL TRAILERING

9,071 KG (20,000 lbs.)†

MAX AVAILABLE GCWR

13,607 KG (30,000 lbs.)†

WHEELBASE

159.0"–172.0"

FRONT/REAR TREAD WIDTH
SRW:

68.4"/68.3"

MAX AVAILABLE GOOSENECK/FIFTH-WHEEL TRAILERING RATING

9,661 KG (21,300 lbs.)†

GROUND CLEARANCE

11.1"–11.2"

CARGO VOLUME

69.5–83.5 cu. ft.†

MAX AVAILABLE PAYLOAD

1,871 KG (4,127 lbs.)†
VIEW DETAILED SPECS
2024-sierra-hd-slt-2500-double-cab-spec-v2.png

The Sierra 2500 HD AT4X off-road work truck comes in a 4WD Crew Cab model with a 6' 9" standard bed. Single Rear Wheel only.

MAX AVAILABLE CONVENTIONAL TRAILERING

8,391 KG (18,500 lbs.)†

MAX AVAILABLE GCWR

12,473 KG (27,500 lbs.)†

WHEELBASE

159.0"

FRONT/REAR TREAD WIDTH
SRW:

69.4"/69.3" 

MAX AVAILABLE GOOSENECK/FIFTH-WHEEL TRAILERING RATING

8,164 KG (18,000 lbs.)†

GROUND CLEARANCE

11.6"

CARGO VOLUME

69.5 cu. ft.†

MAX AVAILABLE PAYLOAD

1,498 KG (3,304 lbs.)†
VIEW DETAILED SPECS

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Your safety is very important to us. If you want to determine whether or not there is a recall on your current vehicle or on a vehicle you are considering buying, visit https://www.gmccanada.ca/en/ownercenter/recalls

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