2020 GMC Sierra 2500HD Review

Sierra 2500HD

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2020 GMC Sierra 2500HD Overview

At the crossroads of luxury and workhorse trucks sits the 2020 GMC Sierra 2500 Heavy Duty. It receives several updates for 2020. The GMC Sierra 2500HD competes with other heavy-duty offerings such as the Ram 2500 Heavy Duty and Ford F-250 Super Duty.

The new Sierra HD evolves from its predecessor with large, crisp headlights and a massive chrome grille. The massive grille features louvers within it that can stay open to feed the powerful engines or can slide close to make the Sierra HD more aerodynamic and conserve fuel.

The Sierra 2500HD offers the choice of either a gas-powered V8 or a diesel V8. The gas 6.6-liter V6 makes 401 horsepower and 464 pound-feet of torque and pairs with through a 6-speed automatic transmission. The 6.6-liter Duramax Diesel V8 engine makes 445 horsepower and 910 pound-feet of torque. This massive output is managed by a new 10-speed Allison transmission, routing power to the rear wheels, or available four-wheel drive (4WD) with low range. When properly equipped, the 2020 GMC Sierra 2500HD can tow 18,500 pounds.

The 2020 Sierra 2500HD has a longer wheelbase, taller hood, and taller overall height than its predecessor. It also has an increased bed volume with 12 bed tie-downs. For 2020, the corner rear bumper bed steps have been enlarged and joined by additional steps ahead of the rear wheel wells.

The Sierra 2500HD trim lineup will include the SLT, AT4, and range-topping Denali. Standard or optional features include an updated ProGrade Trailering system with 15 cameras, an available 15-inch head-up display (HUD), and a segment-first rear-camera mirror. The Sierra also comes with an updated infotainment system with Apple CarPlay and Android Auto.

The tailgate, dubbed the MultiPro tailgate, is another innovation of GMC. Available on all trims, and standard on the SLT, AT4, and Denali trims, the MultiPro tailgate has six functions to handle all the needs of a worksite or weekend warrior. These functions can make it easier to load oversized items or create a perfect working surface for standing while working with a laptop.

The first examples of the 2020 GMC Sierra 2500HD will hit dealer lots in the summer of 2019.


From open-wheel racecars to specialty off-road vehicles, George Kennedy has driven it all. A career automotive journalist, George has been a contributor, editor, and/or producer at some of the most respected publications and outlets, including Consumer Reports, the Boston Globe, Boston Magazine, Autoblog.com, Hemmings Classic Wheels, BoldRide.com, the Providence Journal, and WheelsTV.

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