2021 Hyundai Sonata owner complaints
Most named: engine
34 of 134 complaints
- Crashes
- 7
- Fires
- 0
- Injuries
- 13
- Deaths
- 0
Owner complaints to the US safety agency (NHTSA), 2021 models.
Components named most often
A complaint can name more than one component.
| Component | Complaints | Share of complaints |
|---|---|---|
| Engine | 34 | 25% |
| Other or not specified | 32 | 24% |
| Transmission and drivetrain | 25 | 19% |
| Fuel system | 21 | 16% |
| Electrical system | 17 | 13% |
| Fuel system, gasoline | 13 | 10% |
Complaints by model year
Rivals, 2021
| Rival | Complaints |
|---|---|
| Honda Accord | 234 |
| Kia K5 | 167 |
| Hyundai Elantra | 131 |
| Nissan Altima | 70 |
| Honda Insight | 25 |
| Mazda MAZDA6 | 17 |
What this cannot tell you
Counts, not rates. Sales volume differs by model.
Complaints are owner reports, not confirmed defects.
Source: NHTSA complaints data (api.nhtsa.gov), public domain. Collected 2026-10-05.
- Two or more sources agree
- One source
- Model-level or estimate
- Sources differ