2021 GMC Sierra 3500HD Review
Price: $61,995





+203
GMC Sierra 3500HD model years
GMC Sierra 3500HD types
- Crew Cab
- Regular Cab
- Double Cab
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
Reliability Ratings by RepairPal
3 out of 5 stars3/5Average
#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
$1,061/yr
vs. $752/yr
for Average Fullsize Truck
for Average Fullsize Truck
Frequency
0.83x/yr
vs. 0.98x/yr
for Average Fullsize Truck
for Average Fullsize Truck
Severity
24.7%
vs. 19.9%
for Average Fullsize Truck
for Average Fullsize Truck
powered by RepairPal
GMC Sierra 3500HD Owner Reviews
Most Helpful Owner Reviews
Trending topics
WHAT A TRUCK
5 out of 5 starsBill 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 … useful tailgate, I can see Ford, Dodge and Chevrolet using the same basic tailgate in the near future.
I really cant wait to haul my 5th wheel with this truck. Once I make that first trip I will update this review regarding the towing...
A big thank you for Thompsons GMC in Placerville, CA for such a great purchasing experience.
It’s been about a year since I purchased my GMC 3500 Denali and wanted to update my review.
I still love this truck so much. I’ve towed my 5th wheel RV approximately 8000K miles. This truck tows my 5th wheel like a dream. The cooling system is definitely a 100% improvement over my 2008 while towing in the warmer weather.
About the only thing I’d like to see is GM add more information to the heads up display (HUD) like your blind spot indicators.
I’m glad we bought when we did because I hear that dealers are having a tough time receiving new trucks.
Bottom line is this, I’d buy this truck all over again absolutely No Regrets!!!!
Heavy Duty tuxedo surpassed expecations
5 out of 5 starsCorey, 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 … supportive. When I hooked up the 3x axle boat and set out to the lake I was amazed at the poise and power. It made towing enjoyable! I really like my F250, but this truck is awesome.
Incredible
5 out of 5 starsRon, 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 … a fifth wheel hitch) I love the 10 speed transmission and the 6.6 diesel has more than enough HP and torque.
GMC hit it out of the park!
Trailer issues
2 out of 5 starsMario, 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.
2021 Sierra 3500HD Highlights
Crew Cab
Base
Base MSRP Excludes Destination Fee | $41,500 |
---|---|
Engine Type | Gas |
Seating | 6 seats |
rear wheel drive | |
Max Towing Capacity | 20,000 lbs. |
Warranty | 3 years / 36,000 miles |
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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