Details

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

Stock: D5602
VIN: 1GT4UPEY3SF133316
Mileage: 15
Engine: Turbocharged Diesel V8 6.6L/
City MPG:
Highway MPG:

Highlights

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

Overview

**Unleash Your Inner Adventurer with the 2025 GMC Sierra 2500HD AT4: Power Precision and Unmatched Capability in Thunderstorm Grey**

Introducing the 2025 GMC Sierra 2500HD AT4 a truck designed for those who demand excellence in every drive. With its commanding presence in Thunderstorm Grey this Crew Cab Pickup is more than just a vehicle; it's a statement of strength and sophistication.

Under the hood the Duramax 6.6L Turbo-Diesel V8 engine delivers an astounding 470 horsepower and 975 lb-ft of torque ensuring you have the power to conquer any terrain. Paired with the Allison 10-Speed Automatic Transmission this truck offers seamless gear shifts and enhanced fuel efficiency making every journey smoother and more efficient.

The AT4 trim is built for the adventurer featuring the Gooseneck/5th Wheel Prep Package for those heavy-duty towing needs. Whether you're hauling equipment or embarking on a cross-country trip the integrated hitch platform and bed-mounted 7-pin trailer harness provide the reliability and ease you need.

Inside the Jet Black/Kalahari interior exudes luxury and comfort. The AT4 Preferred Package includes a Universal Home Remote rear sliding power window and roof marker lamps adding convenience and style to your driving experience.

For those who seek a blend of rugged capability and refined elegance the 2025 GMC Sierra 2500HD AT4 is your ultimate driving companion.

Dean Cooley GM has been serving the Parkland area since 1995 and we are proud to have contributed to the area's automotive needs for almost three decades. Specializing in Chevrolet Buick and GMC vehicles along with certified pre-owned options we take pride in matching you with the perfect vehicle to suit your needs. Our in-house financial experts are dedicated to simplifying the financing and leasing process offering personalized solutions. At the heart of our operation lies our service department complete with a cutting-edge collision and glass center. Here we service all makes and models with meticulous precision and care. We also have a comprehensive parts department stocked with essential parts accessories and tires – all conveniently located under one roof. Visit us today at 1600 Main Street South in Dauphin and experience a new standard in the automotive industry. Dealer permit #1693.

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Installed Options

Thunderstorm grey $495

Options

Thunderstorm grey
THUNDERSTORM GREY
GVWR 11 350 LBS. (5148 KG)
HIGH IDLE SWITCH
TIRES LT275/65R20 E 126/123 BF GOODRICH OFF-ROAD T/A KO3
SUNROOF POWER
REAR AXLE 3.42 RATIO
Lane Departure Warning
Navigation System
Keyless Start
Auxiliary Audio Input
Smart Device Integration
Power Door Locks
Variable Speed Intermittent Wipers
Tire Pressure Monitor
Power Windows
Rear Head Air Bag
Daytime Running Lights
Requires Subscription
Cross-Traffic Alert
Front Collision Warning
Heated Steering Wheel
Intermittent Wipers
Automatic Highbeams
Daytime Running Lights
Passenger Adjustable Lumbar
Bucket Seats
Adjustable Steering Wheel
Bed Liner
Front Side Air Bag
Tow Hitch
Four Wheel Drive
Stability Control
Adaptive Cruise Control
Mirror Memory
Telematics
Passenger Air Bag
Front Collision Warning
Keyless Entry
ABS
Aerial View Display System
Auto-Dimming Rearview Mirror
Climate Control
Auxiliary Audio Input
Pass-Through Rear Seat
Floor Mats
Lane Departure Warning
Seat Memory
Running Boards/Side Steps
Bluetooth Connection
Requires Subscription
Keyless Start
Tires - Front All-Terrain
Smart Device Integration
Steering Wheel Audio Controls
Power Passenger Seat
Telematics
Bluetooth Connection
Power Mirror(s)
Power Folding Mirrors
MP3 Capability
MP3 Capability

Jet black with kalahari accents, perforated front leather seat trim
TRANSMISSION ALLISON 10-SPEED AUTOMATIC
JET BLACK WITH KALAHARI ACCENTS PERFORATED FRONT LEATHER SEAT TRIM
ENGINE DURAMAX 6.6L TURBO-DIESEL V8 B20-DIESEL COMPATIBLE (470 hp [350.5 kW] @ 2800 rpm 975 lb-ft of torque [1322 Nm] @ 1600 rpm) (Includes (K05) engine block heater.)
GOOSENECK / 5TH WHEEL PREP PACKAGE -- HITCH PLATFORM TO ACCEPT GOOSENECK OR 5TH WHEEL HITCH. Includes hitch platform with tray to accept ball stamped bed holes with removable caps installed and bed mounted 7-pin trailer harness (similar to UY2 harness).
AT4 PREFERRED EQUIPMENT GROUP includes standard equipment
AT4 PREFERRED PACKAGE includes (UG1) Universal Home Remote (A48) rear sliding power window and (U01) Roof Marker Lamps
Driver Adjustable Lumbar
Privacy Glass
Traction Control
Driver Air Bag
Rear Defrost
Heated Front Seat(s)
Daytime Running Lights
Fog Lamps
Auxiliary Audio Input
Cruise Control
Locking/Limited Slip Differential
Integrated Tailgate Step
Multi-Zone A/C
Floor Mats
Security System
Heated Rear Seat(s)
Power Windows
Driver Restriction Features
Power Windows
WiFi Hotspot
Rain Sensing Wipers
Power Door Locks
Satellite Radio
Conventional Spare Tire
AM/FM Stereo
Requires Subscription
Front Collision Mitigation
Power Driver Seat
Rear Parking Aid
Automatic Highbeams
Tires - Rear All-Terrain
Front Collision Mitigation
4-Wheel Disc Brakes
Remote Engine Start
Requires Subscription
Rear Bench Seat
Front Collision Warning
Front Collision Mitigation
Leather Seats
Bluetooth Connection
Back-Up Camera
Front Head Air Bag
Cooled Front Seat(s)
Back-Up Camera
Aluminum Wheels
Premium Sound System
Tow Hooks
Heated Front Seat(s)
Power Steering
Blind Spot Monitor
Passenger Air Bag Sensor
Integrated Turn Signal Mirrors
Heated Mirrors
MP3 Capability

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, 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. (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

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
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

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 One Standard (OnStar One Business Standard for Fleet) (Included for up to 8 years. Terms and limitations apply.)
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
Wheels, 20" (50.8 cm) High Gloss black aluminum wheels 8 spokes

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
Wheelhouse liners, rear
Wipers, front rain-sensing

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