GMC Sierra 2500HDs for sale in Ajax, ON

2026 GMC Sierra 2500 HD Denali

Luxury Meets Heavy-Duty Power

The 2026 GMC Sierra 2500 HD Denali defines what it means to combine uncompromising strength with premium refinement. Engineered for those who demand more from a heavy-duty truck, it delivers immense capability, cutting-edge technology, and handcrafted luxury — all wrapped in unmistakable Denali design.

Power That Commands Respect

Beneath the hood lies the legendary 6.6L Duramax Turbo-Diesel V8 engine (L5P) producing 470 horsepower and an incredible 975 lb-ft of torque. This powerhouse pairs with an advanced 10-speed automatic transmission (MGM) to deliver seamless torque delivery, whether you’re towing a fifth-wheel trailer or navigating urban streets.

With Exhaust Brake (K40), 220-amp alternator (KW5), and High Idle Control (UF3), the Sierra Denali is engineered to perform — even in the most demanding conditions. The Gooseneck/5th-Wheel Prep Package (Z6A) and 3.42 rear axle ratio (GU6) make it a towing champion, while the Heavy-Duty Front Spring/Camper Package (F60) enhances stability and ride control when fully loaded.

Add in an engine block heater (K05) and winter grille cover (BHP), and this truck is built to conquer every Canadian season.

Bold Design. Signature Denali Presence.

Finished in Onyx Black (GBA), the Sierra Denali commands attention with its massive chrome grille, signature C-shaped LED lighting, and 20-inch Ultra-Bright Machined Aluminum Wheels (Q7F) with chrome inserts and black painted pockets.

Power-retractable assist steps with LED perimeter lighting (BRS) provide both function and finesse, while the available Black Badging Package (RFE) — featuring Black GMC emblems (SFZ) and Black Sierra nameplates (RIK) — adds a custom, stealth-inspired look.

All-Terrain tires (QF9) deliver confident grip across road and trail, while premium touches like chrome mirror caps, Denali badging, and illuminated accents reinforce its position as the most luxurious truck in its class.

First-Class Comfort and Craftsmanship

Inside, the Jet Black Forge perforated leather seating (H2X) wraps the cabin in sophistication. Heated and ventilated front bucket seats (A50) with a full centre console (D07) provide unmatched comfort and control. Premium floor liners with removable carpet inserts (BKF/BKE) protect the cabin while maintaining a polished appearance.

Enjoy the open air with the power sunroof (CF5) and utilize smart storage solutions with the rear underseat lockable storage bin (VBJ). Every inch of this interior is refined, quiet, and built to handle long hauls or short commutes in equal style.

Technology That Redefines Heavy-Duty

The Denali Reserve Package (PEC) equips this model with the Technology Package (CWM), featuring:

• 15" Multicolour Head-Up Display (UV6) projecting key performance data onto the windshield

• Rear Camera Mirror (DRZ) with full camera display

• 13.4" GMC Premium Infotainment System (IOK) with built-in Google Maps, Google Assistant, and voice-activated navigation

• Wireless Apple CarPlay® and Android Auto™ compatibility

Enjoy immersive sound from the Bose® Premium Audio System, and stay seamlessly connected with Bluetooth®, OnStar®, and Wi-Fi® hotspot capability.

Integrated In-Vehicle Trailering App (UET), Trailer Tire Pressure Monitor Sensors (PTT), and Hitch Guidance with Hitch View make towing smarter, safer, and more precise than ever before.

Capability & Utility

The Sierra Denali HD is built to handle every challenge with ease:

• 11,750 lb GVWR (JGP)

• Gooseneck/5th-Wheel Prep Package (Z6A)

• Exhaust Brake and Tow/Haul Mode

• 220-Amp Alternator and Heavy-Duty Cooling

• Integrated Trailer Brake Controller and Trailering Provisions

• Bed-Mounted 7-Pin Harness for Trailer Connectivity

• Premium Cargo Bed Lighting and CornerStep Rear Bumper

Whether hauling construction equipment or a luxury camper, the Denali HD blends effortless power with professional-grade confidence.

Key Highlights

• 6.6L Duramax Turbo-Diesel V8 – 470 hp / 975 lb-ft torque

• 10-Speed Automatic Transmission

• Onyx Black Exterior with Black Badging Package

• 20" Ultra-Bright Machined Aluminum Wheels

• Jet Black Forge Leather Interior

• Denali Reserve Package with Technology Package

• 15" Head-Up Display & Rear Camera Mirror

• Bose® Premium Audio System

• Gooseneck/5th-Wheel Prep Package

• Power-Retractable Assist Steps with LED Lighting

• Sunroof & Premium Floor Liners

• Trailer Tire Pressure Monitoring System

Built for Canada

With block heater, battery protection, high-output alternator, and cold-climate engineering, the 2026 Sierra Denali 2500 HD is designed to perform flawlessly across Ontario’s toughest conditions — from construction sites to cottage country.

Now Available at Boyer Chevrolet Buick GMC Ajax 📍 425 Bayly Street West, Ajax, Ontario 📞 905-427-2500

2026 GMC Sierra 2500 HD Denali Ultimate – Glacier White Tricoat

Pure luxury meets heavy-duty power in the 2026 GMC Sierra 2500 HD Denali Ultimate. Finished in the striking Glacier White Tricoat, this flagship model represents the absolute highest expression of craftsmanship, technology, and strength that GMC offers. From its commanding stance to its meticulously appointed interior, Denali Ultimate stands in a class of its own.

Power comes from the legendary 6.6L Duramax Turbo-Diesel V8, delivering an incredible 470 hp and 975 lb-ft of torque paired with the proven 10-Speed Allison Automatic Transmission. Whether towing a fifth-wheel, hauling equipment, or commanding highway miles, this truck provides unmatched durability, torque delivery, and control.

Inside, the Denali Ultimate surrounds you with full-grain Alpine Umber leather, massaging seats, open-pore wood, premium stitching, and exclusive Denali Ultimate badging. A massive 13.4" GMC Premium Infotainment System with Google Built-In keeps you connected with wireless Apple CarPlay/Android Auto, customizable profiles, and enhanced navigation.

This model is equipped for serious capability with dual alternators, Snow Plow & Camper Package, Gooseneck/5th Wheel Prep Package, HD skid plates, and high-capacity cooling. Luxury meets practicality with a RealTruck hard-folding tonneau cover, all-weather liners, and advanced trailering technologies.

The 2026 Sierra Denali Ultimate is the ultimate combination of strength, refinement, and cutting-edge technology.

Key Features Include:

• 6.6L Duramax Turbo-Diesel V8 (470 hp / 975 lb-ft)

• 10-Speed Allison Automatic Transmission

• 11,350 lb GVWR

• 3.42 Rear Axle Ratio

• 20" Ultra-Bright Machined Aluminum Wheels

• LT275/65R20 All-Terrain Tires

• Alpine Umber Full-Grain Leather Interior

• 13.4" Premium GMC Infotainment w/ Google Built-In

• Snow Plow Prep / Camper Package

• Dual Alternators (220A & 170A)

• High Idle Switch

• Gooseneck / 5th Wheel Prep Package

• Skid Plates (Transfer Case & Oil Pan)

• Hard Folding RealTruck Advantage Tonneau Cover (LPO)

• All-Weather Floor Liners (LPO)

• Front License Plate Kit

• 3 Years SiriusXM Included

📞 Call to Action

Experience true heavy-duty luxury in person. Call us today at 905-427-2500 or visit Boyer Chevrolet Buick GMC Ajax, 425 Bayly Street West, Ajax, Ontario to see this 2026 Sierra Denali Ultimate for yourself.

2026 GMC Sierra 2500HD Denali Crew Cab Duramax Diesel – Onyx Black

Power meets prestige in the 2026 GMC Sierra 2500HD Denali Crew Cab, a heavy-duty truck engineered for drivers who demand uncompromising strength, advanced technology, and unmistakable Denali luxury. Finished in Onyx Black and sitting on striking 20" ultra-bright machined wheels with chrome inserts, this Sierra delivers a commanding presence whether on the job site or pulling up to dinner downtown.

Legendary Duramax Diesel Power

At the heart of this Sierra Denali is the renowned Duramax 6.6L Turbo-Diesel V8, producing an incredible 470 horsepower and 975 lb-ft of torque. Paired with a 10-speed automatic transmission, this heavy-duty powertrain delivers exceptional towing capability, smooth power delivery, and impressive durability for work or recreation.

The 3.42 rear axle ratio, integrated exhaust brake, and Gooseneck / 5th Wheel Prep Package make this truck a serious towing machine, ideal for hauling trailers, campers, boats, or equipment across Ontario and beyond.

Denali-Level Luxury

Step inside and experience the premium craftsmanship that defines the Denali name. The Jet Black Forge perforated leather interior surrounds you in refined comfort, while the spacious Crew Cab provides exceptional room for passengers and gear.

This Sierra also features the Denali Reserve Package, adding even more luxury and technology to an already impressive truck.

Highlights include:

• Power sunroof • Power-retractable assist steps with LED perimeter lighting • Multicolour 15" Head-Up Display • Rear Camera Mirror with full camera display • Premium materials and Denali interior detailing

The result is a heavy-duty truck that feels just as comfortable on long highway drives as it does towing a trailer.

Advanced Technology & Connectivity

The 13.4" GMC Premium Infotainment System with Google built-in serves as the command centre for navigation, voice commands, and connectivity.

You’ll enjoy:

• Wireless Apple CarPlay & Android Auto • Bluetooth streaming audio • Large multi-touch display • Integrated navigation and voice assistance • Customizable driver profiles

Everything is designed to keep you informed, connected, and in control.

Built for Work & Canadian Conditions

This Sierra Denali is equipped with several features designed for serious work and winter durability, including:

• Engine block heater • Winter grille cover • 220-amp alternator • Gooseneck / 5th wheel prep package • All-weather floor liners • Front and rear splash guards

Whether you're towing equipment or heading north with a trailer, this truck is ready.

Why Buy Your GMC Sierra Denali at Boyer Chevrolet Buick GMC Ajax?

At Boyer Chevrolet Buick GMC Ajax, located at 425 Bayly Street West, we proudly maintain a 4.7-star Google rating with over 1,500 customer reviews. Our team is committed to providing a transparent, professional, and enjoyable dealership experience.

When you choose Boyer Ajax, you receive:

• Competitive lease and finance options • A trusted GM dealership serving Durham Region • A full service and parts department for long-term ownership support • A team dedicated to building relationships, not just transactions

Experience the Sierra Denali Today

If you're considering a Ford Super Duty Platinum, Ram 2500 Limited, or other luxury heavy-duty trucks, the 2026 GMC Sierra 2500HD Denali deserves your attention.

📞 Call 905-427-2500 📍 Visit Boyer Chevrolet Buick GMC Ajax 📅 Book your test drive today

Heavy-duty strength. Denali luxury. Duramax performance.

Let’s get you behind the wheel. 🚛

2026 GMC Sierra 2500HD Denali Crew Cab – Duramax Diesel 🖤🛻

This isn’t just a truck… it’s a statement written in torque. The 2026 GMC Sierra 2500HD Denali Crew Cab blends heavy-duty capability with Denali-level luxury, wrapped in a commanding Onyx Black finish.

It’s built to tow like a beast and arrive like a boss.

Duramax Power – Built for Serious Work

At the core of this Sierra HD is one of the most respected diesel engines in the game:

• 6.6L Duramax Turbo-Diesel V8 • 470 horsepower / 975 lb-ft of torque • 10-speed automatic transmission

Paired with a 3.42 rear axle and 11,350 lb GVWR, this truck is engineered for:

• Heavy towing and hauling • Smooth power delivery under load • Long-haul durability

And with the integrated exhaust brake, you get added control when towing downhill or managing heavy loads.

Ready to Tow – Built-In Capability

This Sierra is set up right from the factory for real work:

• Gooseneck / 5th Wheel Prep Package • In-bed 7-pin wiring harness • Factory-installed hitch platform

Whether it’s a job site, trailer, or recreational towing, this truck is ready on day one.

Built for Canadian Conditions

Designed with real-world durability in mind:

• Engine block heater • Winter grille cover • 220-amp alternator

From cold starts to heavy electrical demand, it’s ready for Ontario winters.

Denali Design – Premium Presence

The Denali trim delivers unmistakable presence:

• Onyx Black exterior • 20" ultra-bright machined wheels with chrome accents • Bold Denali grille and premium detailing

It’s rugged capability wrapped in upscale design.

Premium Denali Interior

Step inside and you’ll find refinement everywhere:

• Forge perforated leather seating (Jet Black) • Heated and ventilated seating (Denali standard) • Spacious Crew Cab with premium materials throughout

This is where work meets comfort.

Power Sunroof – Open It Up

Bring light into the cabin with the power sunroof:

• Expansive feel for driver and passengers • Adds to the premium driving experience

Technology Package – Elevated Driving

Packed with advanced features to enhance visibility and control:

• 15" Multicolour Head-Up Display • Rear Camera Mirror with full display • Premium driver-focused technology

Everything you need, right in your line of sight.

GMC Infotainment – Big Screen, Big Capability

Front and centre is the 13.4" GMC Infotainment System with Google built-in:

• Integrated navigation and voice assistance • Wireless Apple CarPlay & Android Auto • Bluetooth streaming and customizable profiles

It’s powerful, intuitive, and built for modern drivers.

Added Value

This Sierra includes:

• 3 Years of SiriusXM • Front license plate mounting package

Why Buy Your Sierra HD Denali at Boyer Chevrolet Buick GMC Ajax?

At Boyer Chevrolet Buick GMC Ajax, located at 425 Bayly Street West, we proudly maintain a 4.7-star Google rating with over 1,500 reviews.

When you choose Boyer Ajax, you get:

• Truck specialists who understand HD capability • Competitive finance and lease options • A trusted dealership serving Ajax, Whitby, Oshawa & Durham Region • Full support from factory-trained technicians

Heavy Duty Meets High End

If you're comparing trucks like the Ford F-250 Lariat/Platinum or Ram 2500 Laramie/Limited, the 2026 GMC Sierra 2500HD Denali delivers unmatched torque with premium refinement.

📞 Call 905-427-2500 📍 Visit Boyer Chevrolet Buick GMC Ajax 📅 Book your test drive today

Serious power. Premium presence. Ready to work.

2026 GMC Sierra 2500 HD Denali – Diesel Luxury with Real Heavyweight Capability

Some trucks are built to talk tough. This one simply goes to work. The 2026 GMC Sierra 2500 HD Denali in Onyx Black blends premium Denali refinement with commercial-grade strength, powered by the legendary Duramax 6.6L Turbo-Diesel V8. Whether you’re towing, hauling, trailering, or arriving in style, this truck does it all without breaking stride.

Duramax Diesel Power That Means Business

At the core sits one of the most respected heavy-duty powertrains on the road:

• 6.6L Duramax Turbo-Diesel V8 • 470 horsepower • 975 lb-ft of torque • B20-diesel compatible • Includes engine block heater

This is torque with a capital T. It doesn’t just pull trailers, it relocates landscapes.

Allison-Inspired 10-Speed Automatic Confidence

• 10-speed automatic transmission • Smooth power delivery under load • Strong towing manners • Designed for heavy-duty work cycles

Whether empty or loaded, it stays composed and efficient.

Onyx Black Denali Presence

Finished in Onyx Black, this Sierra looks every bit as commanding as it performs.

• Bold Denali grille styling • Premium chrome and bright accents • Power-retractable assist steps with LED lighting • Black badging package for a custom stealth finish

It arrives like a tailored thunderstorm.

Denali Interior Craftsmanship

Inside, it’s equal parts command centre and first-class lounge:

• Forge perforated leather seating in Jet Black • Premium materials throughout • Quiet, spacious heavy-duty crew cabin • Rear underseat lockable storage bin

Work boots are welcome. So are dress shoes.

Denali Reserve Package

This truck adds elevated comfort and premium tech with the Denali Reserve Package, including:

• Power sunroof • Technology Package upgrades

Because heavy duty doesn’t have to feel industrial.

Technology That Pulls Its Weight

With the included Technology Package, expect advanced visibility and convenience features that make trailering and daily driving easier.

Think sharper sightlines, smarter displays, and fewer blind guesses when maneuvering something this capable.

Built for Serious Towing

This Sierra is loaded for customers who actually tow:

• Gooseneck / 5th Wheel Prep Package • In-bed hitch platform provisions • 7-pin bed-mounted trailer harness • Dealer-installed Hitch Package with gooseneck ball and chain tie-down kit

Horse trailers, equipment trailers, campers, jobsite loads… bring them along.

Snow Plow / Camper Ready

The Snow Plow Prep / Camper Package adds:

• 220-amp alternator • Increased front GAWR • Skid plates • Roof emergency light provisions • Upfitter-friendly pass-through access

That means this truck is ready for business fleets, winter operations, or serious RV life.

Protection & Practicality

Included dealer-installed upgrades:

• All-weather floor liners • Front and rear molded splash guards • Rear underseat composite storage with lockable lid

Because a working truck should stay sharp.

Why Buy from Boyer Chevrolet Buick GMC Ajax?

At Boyer Chevrolet Buick GMC Ajax, located at 425 Bayly Street West, you’ll work with a team that understands HD trucks, towing setups, and commercial needs.

You get:

• Truck and towing specialists • Competitive lease and finance options • Support for business and personal use buyers • Trusted service after the sale • A dealership with a strong local reputation

📞 905-427-2500

Final Word

If you’re comparing the Ford F-250 Platinum, Ram 2500 Limited, or other HD luxury trucks, the 2026 Sierra 2500 HD Denali Duramax stands tall with premium comfort, diesel torque, and real-world capability.

This isn’t just a truck. It’s a mobile command post with a hitch.