The GMC Sierra 2500 and 3500 pickup trucks are ideal for heavy-duty jobs. These workhorses are constructed with durability, power, and luxury in mind, providing the ideal combination for getting the job done in comfort and style. Gus Brown Buick GMC in Whitby, Ontario, has the 2025 Sierra HD and other models in the GMC and Buick lineups. Our staff is eager to assist you with all of your Buick and GMC sales, service, and parts needs. Contact us to get started.
Exterior
Rugged Exterior
The 2025 Sierra HD lineup all include smart and functional exterior features to enhance your experience. Such features include the convenient side-bed steps, Trailering Mirrors, Dual-Path Air Induction, and Advanced LED lighting for both the front and rear of the pickup.
Denali Style
With the redesigned sculptured grille, exclusive wheels, and chrome exterior accents, the Sierra HD Denali is the definition of a luxury truck. With functional features like spray-in bedliner, and 5” Chrome Assist Steps, you’ll be able to accomplish any task in refined luxury.
Multi-Pro Tailgate
The Multi-Pro Tailgate of the Sierra HD includes 6 different functions to enhance your experience with this capable pickup. Expand your cargo capacity with Load Stop, turn the tailgate to a function space with Work Surface, and many more ways to expand your truck bed.
Interior
Durable Style
Outfitted to provide the highest level of comfort and utility, the interior of the Sierra HD is gorgeously crafted and includes numerous amenities to help make your ride as convenient as it is comfortable. Experience an available leather-wrapped heated steering wheel, heated/ventilated front leather-appointed seats, and dual-zone climate control to regulate temperature.
Panoramic Moonroof
Open the available panoramic moonroof with the touch of a button, and explore the beautiful surroundings while allowing natural light into the cabin.
Superior Storage Options
Smartly store everything you need for your work, leisure and more thanks to the storage solutions featured in the 2025 GMC Sierra HD. Storage features include available Rear-Seat Storage, Rear-Fold Split Bench Seats, and an adaptable Centre Console.
Performance
Heavy Duty Capability
Get the most performance out of your Sierra HD truck with features that are exclusive to top trim levels like the Denali Ultimate and AT4X. With impressive features like Independent Front Suspension to increase ride comfort, and a 28” Variable Speed Cooling Fan to help with airflow, your Sierra is ready for the toughest tasks.
Stop & Go Tech
The numerous Stop & Go features of the Sierra HD help assist you both on the road, and while your truck is parked. These features include 2-Speed AutoTrac Transfer Case, Traction Select System, Digital Variable Steering Assist, and Auto Electric Parking Brake Assist.
Powerful Engine Choices
| Class | Sierra 2500 HD | Sierra 3500 HD |
| Engine Options | 6.6L V8, 6.6L Duramax Turbo-Diesel w/ Turbocharger | 6.6L V8, 6.6L Duramax Turbo-Diesel w/ Turbocharger |
| Transmission | 6-speed automatic (heavy duty), Allison 10-speed automatic | 6-speed automatic (heavy duty), Allison 10-speed automatic |
| Max Horsepower | 470 hp | 470 hp |
| Max Torque (lb-ft) | 975 lb-ft | 975 lb-ft |
| Max Conventional Towing | 9,072 kg (20,000 lbs) | 9,072 kg
(20,000 lbs) |
| Max Gooseneck Towing | 10,206 kg
(22,500 lbs) |
16,329 kg
(36,000 lbs) |
| Max Payload | 1,895 kg
(4,178 lbs) |
3,307 kg
(7,290 lbs) |
Safety
Forward Collision Warning
Available Forward Collision Alert can warn you if it detects a potential front-end collision with a vehicle you’re following so you can quickly take action. It can also provide a tailgating alert if you’re following a vehicle too closely.
Lane Departure Warning
Available Lane Departure Warning can alert you if you might be unintentionally drifting out of detected lane lines so you can quickly take action. It will not alert you if you’re using your turn signal or it detects you may be intentionally steering.
Rear Park Assist
The available Rear Park Assist can provide distance alerts to nearby detected objects behind the vehicle to help you park and avoid them when in Reverse at low speeds.
Technology
ProGrade Trailering System
Tow trailers with confidence and ease thanks to the Sierra HD’s available ProGrade Trailering System. These intelligent trailering technologies make hitching and towing go as smoothly as possible. Features include In-vehicle trailering app, myGMC mobile app, Smart trailer integration, and available Jack-knife alert.
15” Head-Up Display
Explore the multicolour 15” diagonal Head-Up Display for the first time ever in the heavy-duty pickup class. Essential vehicle information is projected right onto the windshield, directly in your line of vision, helping you keep your eyes on the road.
High Definition Camera Views
Keep tabs on your truck, trailer and all of your surroundings with up to 15 different available camera views on the 2025 GMC Sierra HD. From the HD Surround Vision system, Rear Camera Mirror, Bed View Camera, and so much more.
2025 Sierra Heavy Duty Trims
Pro
Starting at $68,032*Highlighted features:
- Wireless Apple CarPlay/Android Auto
- Best-in-Class HD Cargo Box Volume
SLE
Starting at $73,032*Highlighted features:
- Traction Select System w/ Tow/Haul Mode
- 17” Machined Aluminum Wheels
SLT
Starting at $89,127*Highlighted features:
- MultiPro Tailgate
- ProGrade Trailering System
AT4
Starting at $99,632*Highlighted features:
- Jet Black Interior
- 20” Gloss-Black Aluminum Wheels
Denali
Starting at $104,127*Highlighted features:
- 20” Ultra-Bright Machined Wheels
- Authentic Open-Pore Wood
AT4X
Starting at $116,427*Highlighted features:
- Obsidian Rush Interior
- Factory-Installed 1.5” Suspension
Denali Ultimate
Starting at $129,227*Highlighted features:
- Signature Vader Chrome Grille
- Exclusive Alpine Umber Interior
Explore the 2025 Sierra HD, and the rest of our incredible Buick and GMC lineup here at Gus Brown Buick GMC Ltd. here in Whitby, Ontario. We offer a great variety of sedans, SUVs, and pickup trucks to serve a variety of our customers needs, as well as the necessary support staff here in our service department to maintain your Buick or GMC vehicle. Book your test drive with us today, and come see why the Gus Brown family has earned the reputation as one of Canada’s best dealership groups over the past decade.