2021 GMC Sierra 2500HD

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2021 GMC Sierra 2500HD Review: Reliable To A Fault

There is no denying the love USA has for its pickup trucks, especially considering they top the sales charts year after year. Thus, it makes sense that some of the best models are locally grown, with the 2021 GMC Sierra 2500HD being a great example. It goes up against the likes of the Ram 2500, Ford F-250, and Chevrolet Silverado 2500, and manages to hold its own despite the fierce competition. GMC has bestowed a choice between two engines to its heavy-duty pickup: a gasoline V8 that develops 401 horsepower and 464 lb-ft of torque, and a turbo diesel that pumps out 445 hp and 910 lb-ft. Properly equipped, it boasts a towing capacity of 18,510 lbs, which is respectable, but a bit behind the class leaders. It's a good-looking vehicle with great credentials, but the interior is lackluster, and the tech features need an update.

Read in this review:

8.2
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2021 GMC Sierra 2500HD Changes: ๐Ÿš™Whatโ€™s the difference vs 2020 GMC Sierra 2500HD?

The 2021 Sierra 2500HD adds a bunch of new features, packages, and exterior colors. Firstly, the X31 Off-Road and Protection package is now available on SLE and SLT trims, while the 1SA Safety Package is now available on the Sierra trim. The 6.6-liter V8 gas engine is now E85 FlexFuel capable, and wireless Apple CarPlay and Android Auto phone integrations are available. The interior of the SLT and Denali is available with removable premium floor mats, a feature that's standard on the AT4. Advanced camera trailering technologies, including jack-knife alert and bed view with zoom, are available, and extra cost colors such as Ebony Twilight, Hunter Metallic, and Cayenne Red Tintcoat join the lineup. The GMC MultiPro tailgate is now standard on the SLE. Other new packages include the SLT Premium, Texas Edition SLT Premium, AT4 Premium Plus, and Denali Black Diamond Edition.

Pros and Cons

  • One of the better-looking trucks
  • Highly capable engine options
  • Decent tow rating with loads of accompanying tech
  • Feels at home on and off the road
  • High reliability and safety rating
  • Shoddy interior quality and design
  • Infotainment suite is lacking
  • Can't tow as much as rivals

Best Deals on Sierra 2500HD

2021 GMC Sierra 2500HD Trims and Prices

See trim levels and configurations:

Trim Engine Transmission Drivetrain Price (MSRP)
Base
6.6L V8 Gas
6-Speed Automatic
Rear-Wheel Drive
Four-Wheel Drive
$36,200
SLE
6.6L V8 Gas
6-Speed Automatic
Rear-Wheel Drive
Four-Wheel Drive
$41,600
SLT
6.6L V8 Gas
6-Speed Automatic
Rear-Wheel Drive
Four-Wheel Drive
$51,600
AT4
6.6L V8 Gas
6-Speed Automatic
Four-Wheel Drive
$59,100
Denali
6.6L V8 Gas
6-Speed Automatic
Four-Wheel Drive
$65,500

Sierra 2500HD Exterior

2021 GMC Sierra 2500HD Front View CarBuzz
2021 GMC Sierra 2500HD Rear View CarBuzz
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Dimensions

  • Length 235.5 in
  • Wheelbase 141.6 in
  • Height 79.9 in
  • Max Width 81.8 in

Exterior Colors

Sierra 2500HD Performance

2021 GMC Sierra 2500HD Frontal Aspect 1 CarBuzz
2021 GMC Sierra 2500HD Aft View CarBuzz
2021 GMC Sierra 2500HD Rim CarBuzz

Engine and Transmission

While you may not get as many options when it comes to powertrains, the Sierra 2500HD pickup doesn't really need more than these two. The standard 6.6-liter 8-cylinder develops a hearty 401 horsepower and 464 lb-ft of torque, which is managed by a heavy-duty 6-speed automatic transmission and directed to the rear or all four wheels. This is the perfect option if you have light work to do and want a capable truck for getting around town. Max towing is limited to 17,370 lbs with a gooseneck hitch.

If you really wanna get things moving, there is also a 6.6-liter turbo diesel V8 engine. This beast delivers 445 hp and 910 lb-ft to the rear-wheel or four-wheel drivetrain through an intuitive 10-speed automatic transmission. The low-down torque really helps you pull off when trailering a heavy load, since this setup can handle up to 18,510 lbs. You won't want for power with either choice, but the diesel is hard to resist. It is also slightly more fuel-efficient, although it's still not good news.

  • Engines
    6.6L Turbo V8 Diesel, 6.6L V8 Gas
  • Transmissions
    10-Speed Automatic, 6-Speed Automatic
  • Drivetrains
    4X4, RWD

Sierra 2500HD Gas Mileage

  • Fuel Tank Capacity
    36.0 Gallons
* 2021 GMC Sierra 2500HD 2WD Regular Cab 142"

Sierra 2500HD Interior

2021 GMC Sierra 2500HD Dashboard CarBuzz
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Seating and Interior Space

  • Seating capacity
    3-seater
  • Front Leg Room 44.5 in
  • Front Head Room 43.1 in

Sierra 2500HD Trunk and Cargo Space

2021 GMC Sierra 2500HD Front Seats CarBuzz
2021 GMC Sierra 2500HD Rearmost Seats CarBuzz
2021 GMC Sierra 2500HD Cargo Capacity CarBuzz

Sierra 2500HD Safety and Reliability

Warranty

  • Warranty Note:
    Preliminary 2021 Warranty \ 
  • Basic:
    3 Years \ 36,000 Miles
  • Drivetrain:
    5 Years \ 60,000 Miles
  • Drivetrain Note:
    HD Duramax Diesel: 5 Years \ 100,000 Miles; Qualified Fleet Purchases: 5 Years
  • Rust-Through:
    6 Years \ 100,000 Miles
  • Corrosion:
    3 Years \ 36,000 Miles
  • Roadside Assistance:
    5 Years \ 60,000 Miles
  • Roadside Assistance Note:
    HD Duramax Diesel: 5 Years \ 100,000 Miles; Qualified Fleet Purchases: 5 Years
  • Maintenance Note:
    1 Year \ 1 Visit

Verdict: ๐ŸIs the 2021 GMC Sierra 2500HD a good Truck?

The 2021 GMC Sierra 2500HD is a real straight shooter; it doesn't pretend to be more than it is, which is a no-nonsense, reliable, dependable pickup truck that sits firmly in the middle of the segment in terms of performance and capabilities. It won't wow you, especially when it comes to the interior, which is basic and hardy, but nothing to write home about. This leans into the whole rugged, workmanlike nature of the Sierra 2500HD pickup and may work in its favor for some shoppers.

There is no safety review of the 2021 GMC Sierra 2500HD, but large, heavy-duty trucks are built to withstand just about anything life can throw at them. However, like the rest of the tech, the safety suite is not as comprehensive and up to date as what you'll find in rivals. The GMC also can't tow as much as class-leaders, even with its strongest engine. Overall, it's a solid pick for the price, with its pros perfectly balancing out its cons.

๐Ÿš—What GMC Sierra 2500HD Model Should I Buy?

The top-tier model in the lineup, the Denali, is simply too expensive, even if it does do much to offset the low-quality cabin issues that plague the truck. Instead, we'd recommend focusing on the strengths of the fifth-gen Sierra and opt for the mid-spec SLE model. It gets enough nice-to-haves to make it feel a little less underwhelming in the cabin, and has access to the turbodiesel, which allows it to max out towing capacity. The 2-door regular cab will help you maintain that rating, but if you want to take the family along for the occasional off-road jaunt in your pickup, the 4-door double cab may suit you better. A base 2WD SLE with the diesel V8 will set the price of the 2021 GMC Sierra 2500HD pickup to $51,490 before destination if you opt for the regular cab with the long bed.

GMC Sierra 2500HD Popular Comparisons

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2021 GMC Sierra 2500HD Video Review

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