2018 Hyundai Sonata problems and complaints
Owners have filed 374 complaints with NHTSA about the 2018 Hyundai Sonata. The most-reported areas: Engine (212), Electrical System (60), Unknown Or Other (58).
Key takeaways
- 374 owner complaints on file with NHTSA.
- 18 involve a crash, 13 a fire, 20 reported injuries.
- Complaints are unverified owner reports; recalls are confirmed defects.
| Component | Complaints | Share |
|---|---|---|
| Engine | 212 | 57% |
| Electrical System | 60 | 16% |
| Unknown Or Other | 58 | 16% |
| Power Train | 40 | 11% |
| Fuel/Propulsion System | 31 | 8% |
| Exterior Lighting | 22 | 6% |
| Vehicle Speed Control | 19 | 5% |
| Structure | 17 | 5% |
| Service Brakes | 17 | 5% |
| Engine And Engine Cooling | 14 | 4% |
| Steering | 9 | 2% |
| Latches/Locks/Linkages | 8 | 2% |
One complaint can name several components, so shares add up to more than 100%.
| Version | Overall | Front | Side | Rollover |
|---|---|---|---|---|
| 2018 Hyundai Sonata 4 DR FWD | 5/5 | 5/5 | 5/5 | 4/5 |
Latest complaints, as filed
Owner-written and unverified by NHTSA.
Structure,engine - filed 2026-10-05
What component or system failed or malfunctioned, and is it available for inspection upon request? The paint is peeling off the car, when I went to the dealership they said this is a known problem for 2015-2018, but they can't fix it there is no recall. It is causing rust. The valve cover gasket leaks oil and caused sp...
Engine - filed 2026-09-21
Hyundai dealership confirms I am in need of a new engine due to large oil consumption which is a known issue on 2018 Hyundai Sonata engines. Hyundai will not approve repairs because I am the second owner and vehicle is out of the 5 year warranty period. I only have 52K miles on my vehicle.
Engine - filed 2026-09-11
One engine valve has lost pressure and is not repairable
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More for the 2018 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.