2021 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
3 -6
Front passenger 3/4 w/ wheels turned.

Positive Owner Reviews

accountCircle Kipp
Computer issues
I love the look and ride of my 2021 AT4 3500 but has been in the shop 3 times already going in for the 4th time tomorrow and only has 2000 miles on it throws all kinds of trouble codes and been doing the same thing over and over they can’t seem to find the issue yet
accountCircle Kipp C
Computer issues
Love the look and ride of my 2020 AT4 but going into the shop for the 4th time now with only 2000 miles on it it throws several trouble codes and reduces power but they can’t seem to find the problem with it

Negative Owner Reviews

accountCircle Kipp
Computer issues
I love the look and ride of my 2021 AT4 3500 but has been in the shop 3 times already going in for the 4th time tomorrow and only has 2000 miles on it throws all kinds of trouble codes and been doing the same thing over and over they can’t seem to find the issue yet
accountCircle Kipp C
Computer issues
Love the look and ride of my 2020 AT4 but going into the shop for the 4th time now with only 2000 miles on it it throws several trouble codes and reduces power but they can’t seem to find the problem with it

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 3 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

2021 GMC Sierra 3500HD Owner Reviews

3.00
2 Reviews
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5 stars 0%
4 stars 0%
3 stars 100%
2 stars 0%
1 star 0%
accountCircle Kipp on December 30, 2020
Computer issues
I love the look and ride of my 2021 AT4 3500 but has been in the shop 3 times already going in for the 4th time tomorrow and only has 2000 miles on it throws all kinds of trouble codes and been doing the same thing over and over they can’t seem to find the issue yet
accountCircle Kipp C on December 30, 2020
Computer issues
Love the look and ride of my 2020 AT4 but going into the shop for the 4th time now with only 2000 miles on it it throws several trouble codes and reduces power but they can’t seem to find the problem with it
View All Reviews (2) chevronRightAlternative

Ranks #5 Full Size Pickup Trucks by Owners

The 2021 GMC Sierra 3500HD has an average owner rating of 2.59 out of 5 which ranks it #5 of 7 other Full Size Pickup Trucks.

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2021 Chevrolet Silverado 2500HD
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2021 GMC Sierra 3500HD
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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