2020 GMC Sierra 3500HD Overview, Reviews, Ratings & Specs

2024 2023 2022 2021 2020 2019 2018
Crash Test
Not Tested
Source NHTSA
MPG (up to)
City / HWY
Source FuelEconomy.gov
Horsepower
401 -445
Seats
5 -6
Front passenger 3/4 w/ wheels turned.

Positive Owner Reviews

accountCircle Cody S
2020 GMC sierra 3500hd review.
Absolutely no problems at all, pulls trailers like nothing, very comfy to drive and has a ton of features to play with, I love the auto tinting mirrors and the camera in the rearview mirror. Only thing I dislike is the multi pro tailgate, but all and all the truck is all around a fantastic machine.
accountCircle Ron Sykes
Stability and stopping power
Iabsolutely love this truck. Its a 2020 3500 DRW Denali and probably the best truck I've owned and ive had all makes. I really don't have any complaints other than it's a bit difficult to find parking for. GMC hit it out of the park.
accountCircle Alyssa M
GMC is where it is at! Never buying another vehicle.
My vehicle has no problems. It drives smooth. No complaints. I would recommended buying this vehicle! Whether long or short trips. You have a relaxing ride, it makes you feel like your not even on the road. It is spacious and nice for big families. You cannot beat how great it is for the price. Practically a steal.
accountCircle Amanda H
GMC 2020. Very nice great in snow.
It has 17 backup cams which help if you pull anything behind you. It has cup holders in the back have kids. Many charging ports so that helps on road trips. Seats are very comfortable. There is storage in the seats which help allot I store many things on there.
accountCircle Adrian M
Perfect for my activities aka hunting, fishing,etc...
Amazing quality all together, perfect for traveling, fishing,hunting, any kinds of activities, amazing seats and interior design,doesn't run out of gas quickly, amazing air conditioning, and space inside. Love it overall and is definitely recommended to help people who work much.

Negative Owner Reviews

accountCircle Tim Nelson
Two Major Problems
2020 GMC 3500 Denali dually has two big oops from the start. Slide in Campers won't work as is because the bed height has been lowered by an inch. My camper has been on 2 dodges, 1 GMC & Ford... All 1 ton vehicles. My new Denali needs a 2 inch spacer under the slide in camper to keep the front overhang from hitting the top of the cab. Also if you drop the tailgate with a hitch left in the tailgate hits the hitch. Don't think the design engineers know anything practical about the use of a truck like this.
accountCircle John
Steering shake
Steering wheel shakes if you put any pressure side to side.Have had it back 3 times to 2 different dealers and still haven't fixed the problem.

GMC Sierra 3500HD Models

Models also known as Trim Levels, are used to identify a vehicle's level of equipment or special features.

car
Base
401-445 HP 5-6 Seats
car
SLE
401-445 HP 5-6 Seats
car
SLT
401-445 HP 5-6 Seats
car
AT4
401-445 HP 5 Seats
car
Denali
401-445 HP 5 Seats
Photos may not match model

2020 GMC Sierra 3500HD Owner Reviews

4.00
7 Reviews
close Write Review
5 stars 71%
4 stars 0%
3 stars 0%
2 stars 14%
1 star 14%
accountCircle Amanda H on December 12, 2020
GMC 2020. Very nice great in snow.
It has 17 backup cams which help if you pull anything behind you. It has cup holders in the back have kids. Many charging ports so that helps on road trips. Seats are very comfortable. There is storage in the seats which help allot I store many things on there.
accountCircle Tim Nelson on October 15, 2020
Two Major Problems
2020 GMC 3500 Denali dually has two big oops from the start. Slide in Campers won't work as is because the bed height has been lowered by an inch. My camper has been on 2 dodges, 1 GMC & Ford... All 1 ton vehicles. My new Denali needs a 2 inch spacer under the slide in camper to keep the front overhang from hitting the top of the cab. Also if you drop the tailgate with a hitch left in the tailgate hits the hitch. Don't think the design engineers know anything practical about the use of a truck like this.
View All Reviews (7) chevronRightAlternative

Ranks #11 Full Size Pickup Trucks by Owners

The 2020 GMC Sierra 3500HD has an average owner rating of 3.17 out of 5 which ranks it #11 of 13 other Full Size Pickup Trucks.

1
car
2020 Ford Super Duty F-350
4.8
2
car
2020 Chevrolet Silverado 2500HD
4.78
11
car
2020 GMC Sierra 3500HD
4

Safety & Reliability

NHTSA Logo
NHTSA Crash Test
(Not Rated)
*National Highway Traffic Safety Administration
IIHS Logo
IIHS Crash Test
(Not Tested)
*Insurance Institute for Highway Safety