Worst 2020 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 2020 GMC Sierra 3500.
| Component | Complaints | Crashes | Fires | Avg Mileage | Volume |
|---|---|---|---|---|---|
| Transmission / Drivetrain | 19 | 3 | — | 66,500 mi | |
| Electrical Faults | 8 | — | 1 | — | |
| Brakes | 7 | 1 | — | — | |
| Engine Problems | 6 | — | 1 | 19,000 mi | |
| Fuel System | 5 | — | — | — | |
| Body Structure | 4 | — | 1 | — | |
| Tire Defects | 3 | — | — | — | |
| Airbags | 1 | 1 | — | — | |
| Electrical System:12v/24v/48v Battery | 1 | — | — | — | |
| Engine And Engine Cooling:Exhaust System:Emission Control:Urea Injection System (Def) | 1 | — | — | — | |
| Headlight/Taillight Failures | 1 | — | — | — | |
| Forward Collision Avoidance: Automatic Emergency Braking | 1 | — | — | — | |
| Diesel Fuel System | 1 | — | — | — | |
| Lane Departure: Warning | 1 | — | — | — | |
| Latches / Locks | 1 | — | — | — | |
| Steering Defects | 1 | — | — | — | |
| Structural Problems | 1 | — | — | — | |
| Tires:Tread/Belt | 1 | — | — | — | |
| Visibility | 1 | — | — | — | |
| Wipers & Visibility | 1 | — | — | — | |
| Wheel Issues | 1 | — | — | — |
Search Owner Complaints
Read what owners actually reported to NHTSA for the 2020 GMC Sierra 3500. Type a keyword (e.g. “transmission”, “stalling”, “brakes”) to filter.
Recalls for 2020 GMC Sierra 3500
8 NHTSA recall campaigns affecting ~2,218,349 vehicles.
General Motors, LLC is recalling certain 2020 Chevrolet Silverado 2500, 3500, GMC Sierra 2500, 3500, and 2020-2022 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles that may have been repaired incorrectly under recall 24V797. The transmission control valve may fail and cause the rear wheels to lock up.
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 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.
General Motors, LLC. (GM) is recalling certain 2020 Buick Enclave, Cadillac XT5 and XT6, Chevrolet Blazer, Silverado 1500, 2500 and 3500 and Traverse and GMC Acadia and Sierra 1500, 2500 and 3500 vehicles. The diffuser component of the Roof-Rail Air Bag (RRAB) inflator may not have been properly crimped to the inflator and could separate from the inflator during air bag deployment.
General Motors LLC (GM) is recalling certain 2020 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 vehicles previously recalled under 20V-142. Some of the vehicles in 20V-324 were not part of Recall 20V-142 but received defect parts during another service (typically during collision repair). The hood-latch striker wires on replacement hoods installed for Safety Recall 20V-142 may not have been heat-treated properly, possibly causing them to fracture.
General Motors LLC (GM) is recalling certain 2020 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 vehicles. The hood-latch striker wires may not have been heat-treated properly, possibly causing them to fracture.
General Motors LLC (GM) is recalling certain 2019-2020 Chevrolet Silverado 1500 and GMC Sierra 1500, and 2020 Silverado 2500, Silverado 3500, Sierra 2500, and Sierra 3500 vehicles equipped with carpet floor covering. When the front seat belt pretensioners deploy, hot gas may vent through an opening in the pretensioner bracket, possibly igniting the carpet.
Other GMC Sierra 3500 Years
2020 GMC Sierra 3500 — FAQ
Answers based on real NHTSA complaint and recall data for this specific model year.
Is the 2020 GMC Sierra 3500 reliable?
What are common problems with the 2020 GMC Sierra 3500?
At what mileage do problems start on the 2020 GMC Sierra 3500?
How safe is the 2020 GMC Sierra 3500?
Does the 2020 GMC Sierra 3500 have any recalls?
Should I buy a 2020 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 2020 GMC Sierra 3500
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