2021 GMC Sierra 3500HD Review

Price Range: $53,990 - $71,000

GMC Sierra 2500HD AT4 Crew Cab Pickup Exterior

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2021 GMC Sierra 3500HD Review

by the Edmunds Experts

What's new

Available wireless connectivity for Apple CarPlay and Android Auto
More features available in the lower trim levels
Part of the fourth Sierra 3500HD generation introduced for 2020

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Reliability Ratings by RepairPal

3/5Average

#14 out of 19 among Fullsize Trucks

RepairPal Reliability Ratings are based on the actual cost, frequency, and severity of unscheduled repairs and maintenance on make/model data for select 2008-2022 vehicles. The reliability of a specific vehicle may vary depending on its maintenance and driving history, model year, trim, and features.

Cost

^{The average total annual cost for unscheduled repairs and maintenance across all model years of the GMC Sierra 3500HD from 2008-2022.}

$1,061/yr

vs. $752/yr
for Average Fullsize Truck

Frequency

^{The average number of times this model is brought into the shop for unscheduled repairs and maintenance in a single year. RepairPal calculates this metric by tracking millions of unique vehicles over multiple years to determine an average number of visits per year (omitting small routine visits, e.g., oil changes).}

0.83x/yr

vs. 0.98x/yr
for Average Fullsize Truck

Severity

^{The probability that a repair will be a major issue, meaning the repair costs 3x the average annual repair cost for all models. This threshold will be higher for vehicles that have higher labor rates and parts costs (such as a premium brand).}

24.7%

vs. 19.9%
for Average Fullsize Truck

powered by RepairPal ^{Based on RepairPal reliability data as of 8/23/2023. Ratings are provided by RepairPal and Edmunds is not responsible for their accuracy.}

GMC Sierra 3500HD Reviews

Owner Reviews

4.6

12 reviews

5(84%)

4(0%)

3(8%)

2(8%)

1(0%)

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Most Helpful Owner Reviews

WHAT A TRUCK

Bill S., 04/06/2020

2020 GMC Sierra 3500HD Denali 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)

I purchased this Denali two weeks ago. I absolutely love this truck. The ride is so smooth and power band is incredible. What a huge difference between my 2008 GMC 2500HD Duramax, its like night and day... I love all the high tech features with the 2020's from the cameras to the front and rear LED lighting. Oh yea forgot about that first of its kind tailgate. Now that's a very …

Heavy Duty tuxedo surpassed expecations

Corey, 08/30/2020

2020 GMC Sierra 3500HD Denali 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)

In my 3rd year of owning the new 2020 GMC 3500 HD Denali after replacing my 2012 F250. Choose the GMC because I did not care for the new Ford styling. I still can not believe this is a HD 3500. While commuting around town, I think I am in my wife's German SUV because the ride and amenities are excellent. Visibility and Camera system are great and the interior seats comfortable and …

Incredible

Ron, 03/13/2020

2020 GMC Sierra 3500HD Denali 4dr Crew Cab 4WD LB DRW (6.6L 8cyl 6A)

After waiting for several months and production delays I was finally able to get my hands on a 2020 3500 Denali DRW and I have to say that this truck was well worth the wait. It drives smoother than any truck I've ever owned and the safety features are incredible. I have absolutely no complaints and with it being a Denali there really isn't any more stuff I will need to add. (other than …

Trailer issues

Mario, 09/13/2021

2020 GMC Sierra 3500HD Denali 4dr Crew Cab 4WD LB DRW (6.6L 8cyl 6A)

Extremely disappointed with my 2020 Denali 3500hd. I own 6 trailers and only 1 works with the "new" trailer integration system. I get trailer not connected display, brake lockup on connecting, flickering lights. Trailers work perfect on other rigs. GM dealership basically said to pound sand and update my trailers to work with their system.

We have a limited number of reviews for the 2021 GMC Sierra 3500HD, so we've included reviews for other years of the Sierra 3500HD since its last redesign.

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2021 Sierra 3500HD Highlights

Type:

Crew Cab

Trim:

Base

Base MSRP Excludes Destination Fee	$41,500
Engine Type	Gas
Seating	6 seats
Drivetrain	rear wheel drive
Max Towing Capacity	20,000 lbs.
Warranty	3 years / 36,000 miles

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Safety

Our experts like the Sierra 3500HD models:

Automatic Emergency Braking: Applies hard braking in the case of a potential front collision or enhances braking initiated by the driver.
Side Blind Zone Alert: Provides alerts on the side mirror when the system detects a moving vehicle in a potential blind spot.
Rear Cross-Traffic Alert: Alerts you to cross traffic on either side when you're backing out of a parking space or driveway.

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2021 GMC Sierra 3500HD Review

Price & Payment

2021 GMC Sierra 3500HD Review

What's new

Reliability Ratings by RepairPal

Cost

Frequency

Severity

GMC Sierra 3500HD Reviews

Owner Reviews

Most Helpful Owner Reviews

Trending topics

WHAT A TRUCK

Heavy Duty tuxedo surpassed expecations

Incredible

Trailer issues

2021 Sierra 3500HD Highlights

Safety

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