Home/ GMC/ Sierra 3500/ 2021

2021 GMC Sierra 3500

Safety Score
97
Safe
Recalls
0
Complaints
18
NCAP Stars

Recalls (0)

No recalls found for the 2021 GMC Sierra 3500.

Owner Complaints (showing up to 50)

Date Component Crash Injuries Summary
2025-11-21 POWER TRAIN No 0 During takeoff the transmission acted as if it was in neutral while I was crossing traffic luckily, the semi truck that…
2025-09-01 ELECTRICAL SYSTEM No 0 The contact owns a 2021 GMC Sierra 3500. The contact stated that while his wife had the vehicle idling with the rear de…
2025-07-14 BACK OVER PREVENTION No 0 The contact owns a 2021 GMC Sierra 3500. The contact stated that while reversing, the back over prevention camera scree…
2025-02-03 UNKNOWN OR OTHER No 0 Vehicle is put into park after driving. Shift to Park warning comes on while vehicle is in park. Vehicle will not shu…
2024-11-10 POWER TRAIN No 0 The contact's son owns a 2021 GMC Sierra 3500 Commercial Vehicle. The contact stated while her son was driving at an un…
2024-09-30 UNKNOWN OR OTHER No 0 There is a known issue with these trucks with the infotainment screen blacking out, which renders the backup cameras in…
2024-08-09 POWER TRAIN No 0 While driving 55mph on a 2 lane road, pulling a 5th wheel camper, the truck transmission downshifted by itself to a low…
2024-07-29 POWER TRAIN No 0 Transmission had to be replaced from the dealership. Hard shifting dealership said truck was 23 days out of warranty. I…
2024-06-01 ELECTRICAL SYSTEM No 0 When carrying the electronic key in my pocket the vehicle will lock/unlock presumably due to the remote contacting othe…
2024-05-16 ENGINE No 0 Multiple instances of diesel engine emissions system parts and software failure. While driving, towing or not, the DIC …
2024-04-19 SERVICE BRAKES No 0 When starting the vehicle, I got a message to service the parking brake (this is the second time I’ve had this warning …
2022-02-24 FUEL/PROPULSION SYSTEM No 0 Part Number: 85138746 - DEF tank assembly, heater, pump, reservoir. I was told there were issues with the heater and p…
2022-02-24 ENGINE No 0 •The diesel exhaust fluid heater is a faulty component in the system, there is a back order on the part with no ETA • M…
2022-01-03 STRUCTURE:BODY No 0 Tailgate falls open while traveling down the road
2021-12-10 ENGINE No 0 The throttle body gets stuck wide open after the eninge gets up to operating temperature, it will give some warning wit…
2021-10-26 SERVICE BRAKES No 0 The vehicle recently had a recall repaired at the dealership. I subsequently took delivery on it as a BRAND NEW UNIT, a…
2021-06-10 SERVICE BRAKES No 0 Trailer brake wiring connection continually disconnectsthen reconnects some time later. Some periods of up to 10 minute…
2021-02-14 POWER TRAIN No 0 Problem: Unable to shift transmission from D to another position like R, P, N due to snow/slush being on shifter. I tra…