CarRecallWatchThe 2020 GMC Sierra 3500 has 8 safety recalls on file with NHTSA.
Owners have filed 51 complaints with NHTSA, including 4 crashes, 2 fires, 4 injuries.
The most-reported problem area is Power Train (19 reports).
2020 GMC Sierra 3500 recalls
Rear Wheels Can Lock Up, Raising Crash Risk
Certain pickups from model years 2020 to 2022 may have been repaired incorrectly under an earlier recall (24V797).
Rear Wheels Can Lock Up, Raising Crash Risk
Certain 2020-2021 GM full-size pickups and SUVs equipped with diesel engines may have a transmission control valve that can fail.
Tailgate May Unlatch While Parked, Risking Open Tailgate on the Road
The electronic gate-release switch on the power-unlatching tailgate can short circuit when water gets into it.
Front Center Seat Belt May Not Restrain Occupant in Crash
Some full-size Chevrolet Silverado and GMC Sierra pickups from the 2019 to 2020 model years have a problem with the seat belt brackets for the front center seat.
Curtain Airbag May Not Deploy Properly in a Crash
The diffuser on the roof-rail curtain airbag inflator may not have been crimped securely to the inflator.
Hood May Open While Driving, Raising Crash Risk
On certain 2020 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 trucks, the hood-latch striker wires on replacement hoods may not have been heat-treated properly, so they can fracture.
Hood May Open Unexpectedly While Driving
Some 2020 full-size pickup trucks may have hood-latch striker wires that were not heat-treated properly.
Seat Belt Gas Vent Can Ignite Carpet, Causing Fire
Certain trucks have front seat belt pretensioners that, when they fire during a crash, can release hot gas through an opening in the pretensioner bracket.
Most common 2020 GMC Sierra 3500 problems
Problem areas named in the 51 complaints owners filed with NHTSA.
| Problem area | Reports |
|---|---|
| Power Train | 19 |
| Electrical System | 9 |
| Service Brakes | 7 |
| Unknown Or Other | 6 |
| Engine | 6 |
| Fuel/Propulsion System | 5 |
| Structure | 5 |
| Tires | 4 |
| Steering | 1 |
| Wheels | 1 |
What owners report
My truck has been exhibiting hard downshifting at certain speeds, when the powertrain loads up such as a grade change, and requires a downshift. I have complained about this issue to the dealership as early as 2022, and 33,185 miles. The dealership made me pay for a transmission $388.90 flush which did not resolve the issue. The problem has become progressively worse, to the point where the toll road transponder fell of my windshield during a recent harsh downshifting incident. At the same time there was an existing MIL and derating for a DEF heater and NOx sensor failure, so during a warranty visit I asked that this transmission issue be addressed. On Friday March 13, the dealership ca
Diesel exhaust fluid tank heater malfunctioned and meted tank and connectors.
Known defect with 2019 and now 2020 GMC sierra trucks. Design was updated for 2021+ which has corrected the seal failure defect. GM has issued a service bulletin to dealers about how to repair the problem. Back window is leaking water. Defective seal noted by GM. GM is only covering the cost of repair if. Vehicle is still under 3/36 warranty. If outside your warranty cost from dealer to owner is $2500 to $6000. A known design failure GM recognized and took steps to change the design for future. Vehicles but will not stand behind vehicles that have this defect. Would like the cost to the repair fall back to GM to cover. Bulletin # 18NA383 [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM
the engine seized at 65mph. available for inspection. was left stranded in a limited access area with no cell service. there was no warning, the engine just stopped at highway speed and would not restart. the problem was confirmed by an independent service center. they couldnt identify which component had failed without a costly teardown. occurred at 112,000 miles, past the 100,000 mile powertrain warranty.
The contact owns a 2020 GMC Sierra 3500. The contact stated that while driving at an undisclosed speed, the vehicle inadvertently went into LIMP Mode. There was no warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed that the transmission valve body sensor had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and referred the contact to the NHTSA Hotline for assistance. The approximate failure mileage was 130,000.
2020 GMC Sierra 3500 questions
Does the 2020 GMC Sierra 3500 have any recalls?
Yes. NHTSA lists 8 safety recalls for the 2020 GMC Sierra 3500: Rear Wheels Can Lock Up, Raising Crash Risk; Rear Wheels Can Lock Up, Raising Crash Risk; Tailgate May Unlatch While Parked, Risking Open Tailgate on the Road; Front Center Seat Belt May Not Restrain Occupant in Crash; Curtain Airbag May Not Deploy Properly in a Crash. Recall repairs are normally free at an authorized dealer.
What are the most common problems with the 2020 GMC Sierra 3500?
Based on 51 owner complaints filed with NHTSA, the most-reported problem areas are Power Train (19), Electrical System (9), Service Brakes (7).
How do I check if a recall on my 2020 GMC Sierra 3500 has been fixed?
Enter your 17-character VIN in our VIN recall check. It shows open recalls that have not been repaired on your specific vehicle. Recall repairs are normally free at an authorized dealer.