Wednesday, June 23, 2021
News 2020 Sierra HD is GMC's Latest Big Truck

2020 Sierra HD is GMC’s Latest Big Truck

GMC is adding its name to the new heavy duty full-size pickup hat with the latest generation of the Sierra HD.

The 2020 Sierra HD unveiled last night joins the recent crop of heavy duty pickups that include the 2020 Chevrolet Silverado HD and the Ram HD unveiled at the last Detroit Auto Show.

As you would expect, the new GMC Sierra HD shares most of its components with the Silverado HD unveiled last December. GMC kept things more traditional with its front grill unlike its Chevy brother, but the Sierra HD is still a massive truck.

It’s bigger in every way than the current Sierra HD and features new cargo bed side steps on every version as well as GMC’s Multipro Tailgate which is either optional or standard depending on the trim.

The bed has also been lowered by about an inch for easier access.

2020 Sierra HD
2020 GMC Sierra 2500 HD Denali

The 2020 GMC Sierra HD will be offered in a new Sierra AT4 variant with both 2500 and 3500 configurations as well as a Denali version. That was to be expected as about half of GMC Sierra HD owners go with the Denali trim.

The Sierra HD Denali features premium leather-appointed seating, authentic open-pore wood trim and dark-finish aluminum decor along with a distinctive pattern for the leather seats.

Power will comme from a 6.6-liter Duramax Diesel V8 with 910 pound-feet of torque which should be good to tow about 30,000 pounds. Official towing capacity specs aren’t confirmed, but for now we are still off the Ram Heavy Duty’s 1,000 pound-feet of torque and 35,000-pound towing capacity.

On the other hand, the new Sierra HD gets a 10-speed automatic, a segment first.

2020 Sierra HD
2020 GMC Sierra HD | Photo: GMC

Advanced ProGrade Trailering Technology

If you buy a 2020 Sierra HD, it’s because you’re looking to tow and tow often. The new ProGrade Trailering Technology first offered on the 2019 Sierra 1500 will help with that.

There are 15 total cameras included in the PTT which provide a complete view of what’s happening behind your Sierra HD as your trying to attach the trailer and after you drive off.

There’s even an industry first transparent trailer view which as the name implies makes your trailer “invisible” in order to assist with parking manœuvres or whenever you need to see directly behind you.

GMC Prograde trailering system
GMC Prograde trailering system

“Trailering is the most important consideration for Sierra Heavy Duty customers, and the new features and technologies in the 2020 Sierra HD make it easier than ever to hitch a trailer and tow it confidently,” said Jaclyn McQuaid, vehicle chief engineer, Heavy Duty Trucks. “We’ve developed this new truck to offer the greatest trailering experience ever offered by GMC.”

The ProGrade Trailering System also includes a Trailering App that enables the owner to test the trailer light and electrical system, a trailer tire pressure and temperature monitoring system, and departure checklist and maintenance reminders.


Other Towing Aid Features in the 2020 GMC Sierra HD

  • Auto Electric Park Brake to automatically apply the parking brake to help maintain truck position when hitching.
  • All-new Park Grade Hold Assist enhances hill hold by using braking effort at each wheel for an extended period of time.
  • All-new larger, door-mounted trailering mirrors with a four-bar link providing power extend and retract for the driver and passenger sides.
  • Integrated trailer brake controller that works with the trailer profile in the Trailering App to recall a specified trailer’s most recent gain setting.
  • Tow/Haul mode that remains engaged on the next key-on cycle, for up to four hours; includes a reminder the feature is engaged.
  • Hill Start Assist and Hill Descent Control.
  • Trailer Sway Control.
  • Auto Grade Braking and Diesel Exhaust Braking.
  • Digital Variable Steering Assist that dynamically optimizes power steering according to driving scenarios, including trailering, and enables features like road pull compensation.
  • Trailering Info Label placed on the driver’s door jamb that clearly calls out the truck’s specific trailering information, including curb weight, GVWR, GCWR, maximum payload, maximum tongue weight and rear GAWR.

2020 GMC Sierra AT4 HD

Like the Sierra 1500, the 2020 Sierra HD will get a more rugged AT4 version. AT4 is GMC’s new-ish off-road designation and models that carry the nameplate get distinctive design features meant to make the truck look tougher.

It’s not all show, however. the Sierra AT4 HD will get an off-road suspension, Rancho shocks, skid plates for improved underbody protection on tough terrain and an Eaton locking rear differential.

Michelin all-terrain tires wrap themselves around 18-inch or 20-inch wheels. There’s also a 15-inch diagonal head-up display and an inclinometer.

The 2020 GMC Sierra HD is scheduled to arrive in late summer. Pricing is yet to be confirmed.

2020 GMC Sierra HD Pictures Gallery

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Charles Jolicoeur
Charles Jolicoeur
Charles Jolicoeur was studying to be a CPA when he decided to drop everything and launch a car website in 2012. Don't ask. The journey has been an interesting one, but today he has co-founded and manages 8 websites including EcoloAuto.com and MotorIllustrated.com as General Manager of NetMedia360. He also sits on the board of the Automotive Journalists Association of Canada. Send me an email

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