The first-ever Sierra HD Denali Ultimate leads a refreshed lineup that includes an updated interior, elevated technologies and more pulling power

Led by the first-ever Sierra Heavy Duty Denali Ultimate, the 2024 model year takes the Sierra Heavy Duty lineup to new heights with premium luxury and comfort, turbocharged pulling power and elevated technology-offering GMC’s most advanced trailering assistance technology.

In addition to the debut of the Denali Ultimate trim, the 2024 Sierra HD will build upon GMC’s premium off-road offerings, introducing the off-road optimized Sierra HD AT4X trim later in the model year.

“The new and enhanced 2024 Sierra HD builds on an already winning foundation,” said Daniella D’Souza, Director of Buick & GMC Canada. “This truck elevates the HD segment with the introductions of the Denali Ultimate trim and will soon add the seriously off-road capable AT4X trim, further strengthening the GMC truck portfolio.”

Heavy Duty Highlights

Enhanced power with the combination of the available 6.6L Duramax Turbo-Diesel V-8 coupled and 10-speed Allison transmission delivering 470 horsepower and 975 lb. ft. of torque providing 25% more low-end torque vs. the current model for a greater feeling of power on demand.

Max towing across the lineup:

• Up to 21,900 pounds on Sierra Pro 2500HD Crew Cab
• Up to 22,500 pounds on Sierra Pro 2500HD—a 4,000-pound increase over the current model
• Up to 36,000 pounds on Sierra Pro 3500HD
• We offer the most available trailering assistance technologies in the HD class through GMC’s ProGrade trailering system, offering up to 14 available camera views

We offer updated technologies including an available new, largest-in-class 13.4-inch-diagonal tablet-style infotainment touchscreen.

The 2024 Sierra HD lineup includes 2500HD and 3500HD models, in Regular Cab, Extended Cab and Crew Cab configurations—with dual-rear-wheel models available on 3500HD. Available trims include Pro, SLE, SLT, AT4, Denali and Denali Ultimate, with the AT4X trim coming later in the model year.

More power and greater refinement for the Duramax Turbo Diesel

The available enhanced 6.6L Duramax Turbo-Diesel, paired with the 10-speed Allison transmission, now delivers 470 hp (at 2800 rpm) and 975 ft-lbs (at 1600 rpm), offering more power across the entire operating speed range. Specifically, low-end torque production increases up to 25 percent, compared to the current model, for improved towing performance.

10-speed Allison transmission enhances gas-engine trailering capability

The Allision 10-speed automatic transmission is now paired with the Sierra HD’s standard 6.6L gas engine. It replaces the previous six-speed automatic, offering smaller “steps” between the gears, which enables the 6.6L gas engine to behold closer to its peak power (401 horsepower and 464 lb.-ft. of torque) for longer periods.

That translates into a more confident feeling of on-demand power, regardless of whether the truck is towing a trailer—but when it is, trailering performance and capability are enhanced thanks in part to the 10-speed configuration, along with the capability of channelling almost every single pound-foot of torque to the tires in every gear.

Elevated and purposeful technology—trailering assistance technologies

The 2024 Sierra HD will also offer our most available trailering assistance technologies in GMC’s HD class through the available, ProGrade Trailering System. The ProGrade Trailering System includes a suite of available intelligent trailering assistance technologies designed to help streamline the hitching and towing process, with integrated tools that help enhance customers’ feelings of safety, confidence and visibility including these new enhancements:

Available Enhanced, Transparent Trailer View For Gooseneck and Fifth Wheel Trailering: Allows the driver to virtually “see through” the trailer. Using the camera mounted on the rear of the truck and an accessory camera on the back of the trailer, it pieces together a view of the area behind the truck and trailer as if the trailer was not there, helping to improve visibility. An enhanced version of this technology for the model year 2024 enables compatibility with the gooseneck and fifth-wheel trailers.

Available Trailer Side Blind Zone Alert: Extends side blind zone alerts to include the blind zone areas around the trailer.

New GCW Alert: This all-new feature warns the driver if the vehicle and trailer weight exceed the vehicle’s Gross Combined Weight Rating.
New, Available Adaptive Cruise Control with Trailering: Allows the Sierra HD’s available Adaptive Cruise Control to be used while trailering and to account for additional drag and increased braking distances when towing a trailer.

High-tech digital displays

The centrepiece of Sierra’s high-tech interior cabin is the new, available 13.4-inch diagonal tablet-style touchscreen. Situated in landscape orientation, the touchscreen offers a user-friendly, customizable experience. An available multicolour, 15-inch-diagonal head-up display and a new available 12.3-inch-diagonal digital instrument cluster are also added to in 2024 model year. Together, this creates over 40 inches of immersive digital displays helping to provide an engaging, customizable, and comprehensive driving experience.

The all-new available touchscreen infotainment center can be configured to a user’s preference, including the ability to operate multiple apps simultaneously in a “split-screen” view (e.g., a Navigation app running on the left side of the screen and a Music app on the right). Sierra HD’s infotainment system will also integrate Google built-in (on all trims except Pro), which when paired with a data plan for full functionality, will allow customers to connect virtually every aspect of their daily lives within their vehicle. The system is compatible with both Wireless Apple CarPlay and Wireless Android Auto.

Premium safety features

The 2024 model year will offer the standard Sierra HD Pro Safety suite of safety and driver assistance technologies, including:

• Forward Collision Alert
• Lane Departure Warning
• Automatic Emergency Braking
• Front Pedestrian Braking (new for 2024)
• IntelliBeam, Auto High Beams
• Following Distance Indicator

Also available on the 2024 Sierra HD is the Pro Safety Plus Package which includes new driver assistance features Rear Cross Traffic Braking and the Trailer Side Blind Zone Alert.

Coming Soon

The refreshed 2024 GMC Sierra HD arrives at dealerships in the first quarter of 2023, with the AT4X coming later in 2023. Pricing will be announced closer to the start of production.