Model year guide
2021 GMC sierra 2500hd
Recalls, most-reported problems, crash-test ratings, fuel economy and what a 2021 GMC sierra 2500hd is worth — from official NHTSA and EPA data. 5 on record.
2021 GMC sierra 2500hd at a glance
Safety recallsNone
Included: that car's specs and build sheet, model-year recall campaigns and a fair price.
2021 GMC sierra 2500hd recalls 0
No NHTSA safety-recall campaigns are on record for the 2021 GMC sierra 2500hd.
Source: U.S. NHTSA, checked 4 Nov 2026. A campaign covers the model year; to see whether a particular car still needs the repair, check its VIN on NHTSA.gov or ask a franchised dealer.
Dimensions & weight
Length
235.4–266.1 in
Width
81.9 in
Height
79.9 in
Wheelbase
141.7–172.0 in
Curb weight
5,924–6,731 lb
Front track
67.3 in
Rear track
68.1 in
Manufacturer-reported figures for the 2021 GMC sierra 2500hd — ranges cover the 10 body / drivetrain versions on record. Source: Transport Canada vehicle specifications via NHTSA.
2021 GMC sierra 2500hd trims & engines on record
Trims
Denali · Fleet/Base · AT4
Engines
6.6L 8-cyl