The All-New 2020 GMC Sierra HD



The all-new 2020 GMC Sierra 2500 and 3500 Heavy Duty are the strongest and most capable HD trucks ever. They were built to take on the hardest jobs you can throw at them with new powertrain options, new available technologies and more functional Durabed than previous Sierra HD's.


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gmc sierra hd enginesAll-new 6.6L V8 gas engine

  • 401 hp / 464 lb-ft of torque
  • Valve Train: overhead-valve, two valves per cylinder, variable valve timing
  • 6-speed automatic, heavy-duty automatic transmission

Available 6.6L V8 Duramax turbo-diesel engine

  • 445 hp / 910 lb-ft of torque
  • Valve Train: overhead-valve, four valves per cylinder
  • Diesel Exhaust Brake System
  • Allison® 10-speed automatic transmission


gmc sierra hd multipro tailgate

 Offers six distinct functions designed to improve loading, unloading and accessing the cargo box.

  • Primary gate - power release
  • Primary gate load stop - floor cargo
  • Easy access - inner gate folds down
  • Full-width step - inner gate folds into a large step
  • Inner gate load stop - second-tier cargo
  • Inner gate work surface


gmc sierra hd camera viewsWith up to 15 cameras, there no where around the GMC Sierra HD that you can't see. The Sierra Heavy Duty offers more camera views than any other competitor, all working to improve your towing job from start to finish.  They can make it easier to get hitched up, provide confidence while you’re on the road, and even help you maneuver into tight spots when you’re ready to park.

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gmc sierra trailering mirrorsNew larger and more functional door-mounted trailering mirrors are standard on the 2500 and 3500 heavy-duty trucks. The mirrors extend and retract using a fourbar-link system that makes for smoother operation, whether done with power or manually.

New for 2020 is the forward-facing spot lamp on each mirror that shines light at about a 45-degree angle, providing illumination on the job site or camp site. If equipped, cargo mirror lamps face rearward to provide more light on the sides of the vehicle, if needed.

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gmc sierra hd designThe all-new 2020 Sierra Heavy Duty trucks will not be mistaken for the all-new 2019 Sierra LD. One of the primary objectives of the new pickup programs, in response to customer feedback, is a more striking differentiation between GMC light-duty and heavy-duty trucks.


gmc sierra trailering systemLike the light-duty sibling, the 2500 and 3500 heavy-duty trucks are available with the Advanced Trailering System. The in-vehicle trailering app can make the process of hitching a conventional, gooseneck, or 5th wheel trailer a breeze. The app includes:

  • Customizable trailer profiles
  • pre-departure checklist
  • Trailer maintenance reminders
  • Trailer security alerts
  • Trailer mileage
  • Tow/haul reminder
  • Trailer electrical diagnosis
  • Tire pressure monitoring alert
  • Trailer brake gain recall

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2020 chevrolet silverado hdThe all-new BedStep that allows you to reach inside the forward half of the cargo box is a simple concept but a clever addition to the HD trucks.


gmc sierra hd cargobox volume

 Best-in-class Heavy Duty cargo bed volume:

  • Roll-formed high-strength steel bed
  • Durable spray-on bedliner
  • 12 cargo tie-downs (500-lb. rating per corner)
  • Best-in-class heavy-duty cargo bed volume
  • Short Bed: 1,971 L (69.6 cu. ft.)
  • Long Bed: 2,364 L (83.5 cu. ft.)



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Recirculating Ball Steering with smart flow power steering system on Sierra and SLE.Digital Variable Steering Assist on SLT, AT4 and Denali, this system automatically adjusts steering based on speed, road conditions, and other inputs to reduce driver effort and fatigue.




Available 220 amp and 170 amp dual alternators on both engine options to make it easy to power the accessories you need for commercial applications.


LED reflector (high intensity on SLT/AT4/Denali) headlamps with LED turn signals and LED signature Daytime Running Lamps are standard. LED headlamps, are effective and efficient, require less energy output and are housed in a more narrow space than ever before.



When driving below 8 km/h, this feature provides distance-to-object alerts to help you park and avoid nearby detected objects directly ahead of or behind the truck during low-speed maneuvering.

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New for the GMC Sierra HD, an available camera integrated into the center high-mounted tail lamp provides owners with a view into their cargo box.

It allows for you to check on items in the box at any time to ensure that your cargo is secure for added peace of mind. The display will timeout after 8 seconds when driving.



Duralife brake rotors feature a hardened surface to reduce corrosion and provide quieter braking with less vibration. The brake system features a corrosion-fighting process called Ferric Nitro-Carburizing (FNC) which can double rotor life expectancy and reduce or minimize rust over non-FNC coated rotors.


Heavy-duty 720 cold-cranking amps battery : 80 Amp-hr

Available Heavy-duty dual batteries with 1460 cold-cranking amps : 70 Amp-hr Maintenance-free with rundown protection and retained accessory power.



The system can help you prevent lane change crashes by providing side-mirror alerts when a moving vehicle is detected rapidly approaching a side blind zone or is in a blind zone.

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In both corners of the rear bumper, large footwells, lined with an anti-slip texture and sized for large work boots, make access to the cargo box easier than ever.


The Durabed of the All-New 2020 Sierra HD is the most functional bed in its class. Made with high-strength steel, the bed features 12 standard tie-downs and larger CornerStep rear bumper, and offers available features like LED cargo area lighting, a built-in 120-volt AC outlet and an all-new side BedStep between the cab and the rear wheel.

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Starting with all 2500HD Crew Cab models featuring an impressive maximum available towing capacity of up to 18,500 lb. (8,392 kg) for conventional and fifth-wheel gooseneck trailers.

The maximum gooseneck towing capability increases by up to 52% to a segment-leading available 35,500 lb. (16,103 kg) on 3500 HD.



Visible in the rear passenger side of the truck box you will find an available box power outlet with 400-watt power inverter.


The Multi-colour 15” Diagonal Head-Up Display shows key information that sits low on the windshield, allowing the driver to stay informed while still seeing clearly ahead.

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If equipped, this automatic dimming mirror provides a wide angle camera view of the area behind the vehicle. Streaming option available if some things are loaded in the cargo bed blocking the rear window. Pull the tab to turn on the display. Push the tab to turn it off. When off the mirror is automatic dimming.

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Sierra HD models offer the technology you need to stay connected everywhere, from the jobsite to the campsite. With simple, easy-to-use touchscreens, standard Bluetooth®, USB, and Apple CarPlay® & Android Auto™ connectivity, and available built-in 4G LTE Wi-Fi® hotspot (data plan required), OnStar, and Navigation, Sierra HD offers great connectivity in every trim level.

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A 20.2L lighted compartment below the armrest with the ability to store hanging file folders.

Small exposed compartments on each side of the floor console.

An open storage bin in the center console and below the centerstack display. Upper and lower glove box.


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