Worst 2021 GMC Sierra 3500 Problems
Top 3 most-reported issues with average mileage at failure.
Transmission / Drivetrain
Electrical Faults
Brakes
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All Problems by Category
Every NHTSA complaint category for the 2021 GMC Sierra 3500.
| Component | Complaints | Crashes | Fires | Avg Mileage | Volume |
|---|---|---|---|---|---|
| Transmission / Drivetrain | 7 | — | — | 133,000 mi | |
| Electrical Faults | 4 | — | — | — | |
| Brakes | 4 | — | — | — | |
| Engine Problems | 3 | — | — | — | |
| Fuel System | 2 | — | — | — | |
| Backup Camera | 1 | — | — | — | |
| Body Structure | 1 | — | — | — | |
| Tires:Tread/Belt | 1 | — | — | — | |
| Visibility:Defroster/Defogger/Hvac System | 1 | — | — | — |
Search Owner Complaints
Read what owners actually reported to NHTSA for the 2021 GMC Sierra 3500. Type a keyword (e.g. “transmission”, “stalling”, “brakes”) to filter.
Recalls for 2021 GMC Sierra 3500
5 NHTSA recall campaigns affecting ~1,661,656 vehicles.
General Motors, LLC (GM) is recalling certain 2020-2022 Chevrolet Silverado 1500, 2500, 3500, GMC Sierra 1500, 2500, 3500, 2021 Cadillac Escalade, Escalade ESV, Chevrolet Tahoe, Suburban, GMC Yukon, and Yukon XL vehicles equipped with diesel engines. The transmission control valve may fail and cause the rear wheels to lock-up.
General Motors, LLC (GM) is recalling certain 2020-2024 Chevrolet Silverado 2500, 3500, GMC Sierra 2500 and 3500 vehicles equipped with power-unlatching tailgates. The tailgate's electronic gate-release switch may short circuit due to water intrusion, which can result in the tailgate inadvertently unlatching while the vehicle is in park.
General Motors, LLC (GM) is recalling certain 2021-2022 Chevrolet Silverado 2500, Silverado 3500, GMC Sierra 2500, and Sierra 3500 vehicles with electronic brake control modules (EBCM) replaced during vehicle assembly. The bolts that attach the brake pressure modulator valve (BPMV) assembly may not be properly tightened, which could fail to seal the two sub-assemblies and allow water intrusion.
General Motors, LLC (GM) is recalling certain 2020 Chevrolet Bolt EV and 2021 GMC Canyon and Sierra 1500, 2500 and 3500, Yukon, Yukon XL, Cadillac Escalade and Escalade ESV and Chevrolet Blazer, Camaro, Colorado, Equinox, Silverado 1500, 2500 and 3500, Suburban and Tahoe vehicles. Incorrect bolts may have been used at one or more fastening locations to secure the seat belts to the vehicle. If an incorrect bolt was used, the seat belt may not be properly attached to the vehicle.
General Motors, LLC (GM) is recalling certain 2019-2021 Chevrolet Silverado 1500 and GMC Sierra 1500, 2021 Chevrolet Suburban and Tahoe and GMC Yukon XL and 2020-2021 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 vehicles. The seat belt brackets may not be secured to the seat frame in the front-row center seating position.
Other GMC Sierra 3500 Years
2021 GMC Sierra 3500 — FAQ
Answers based on real NHTSA complaint and recall data for this specific model year.
Is the 2021 GMC Sierra 3500 reliable?
What are common problems with the 2021 GMC Sierra 3500?
At what mileage do problems start on the 2021 GMC Sierra 3500?
Does the 2021 GMC Sierra 3500 have any recalls?
Should I buy a 2021 GMC Sierra 3500?
Source: NHTSA (National Highway Traffic Safety Administration) complaint and recall databases, aggregated by VinItel.
Wider context: See the full GMC Sierra 3500 reliability report with year-by-year comparison and generation analysis.
Check Your Specific 2021 GMC Sierra 3500
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