2021 Hyundai Sonata problems and complaints
Owners have filed 132 complaints with NHTSA about the 2021 Hyundai Sonata. The most-reported areas: Engine (34), Unknown Or Other (32), Power Train (24).
Key takeaways
- 132 owner complaints on file with NHTSA.
- 7 involve a crash, 0 a fire, 13 reported injuries.
- Complaints are unverified owner reports; recalls are confirmed defects.
| Component | Complaints | Share |
|---|---|---|
| Engine | 34 | 26% |
| Unknown Or Other | 32 | 24% |
| Power Train | 24 | 18% |
| Fuel/Propulsion System | 20 | 15% |
| Electrical System | 17 | 13% |
| Fuel System | 13 | 10% |
| Gasoline | 13 | 10% |
| Forward Collision Avoidance | 9 | 7% |
| Visibility/Wiper | 8 | 6% |
| Structure | 4 | 3% |
| Air Bags | 4 | 3% |
| Visibility | 4 | 3% |
One complaint can name several components, so shares add up to more than 100%.
| Version | Overall | Front | Side | Rollover |
|---|---|---|---|---|
| 2021 Hyundai Sonata 4 DR FWD | 5/5 | 4/5 | 5/5 | 5/5 |
Latest complaints, as filed
Owner-written and unverified by NHTSA.
Fuel System, Gasoline - filed 2026-09-17
The contact owns a 2021 Hyundai Sonata. The contact received notification of NHTSA Campaign: 25V796000 (Fuel System, Gasoline); however, parts were on back order. The contact stated that while driving at an undisclosed speed, the vehicle jerked with an abnormal gasoline odor inside the vehicle. An unknown warning light...
Power Train - filed 2026-09-15
Transmission replaced twice and all of them continue to fail. Several Hyundai service centers are unable to determine the cause and are only able to update/relearn and replace whenever they are able to replicate the issue. The issue is that at a cold start, the car makes a popping sound, jerks and shakes. The car hesit...
Power Train,unknown Or Other,forward Collision Avoidance - filed 2026-08-26
Massive loss of coolant in closed loop cooling system Heat soak. Fail safe mode
Diagnose it yourself
As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
More for the 2021 Hyundai Sonata
Complaints are reports filed by owners with the National Highway Traffic Safety Administration. NHTSA publishes them without verifying them, and counts rise with how many cars were sold, so compare years of the same model rather than different models. Crash ratings are NHTSA's own 5-Star Safety Ratings results.