2018 Mercedes-Benz C-Class problems and complaints
Owners have filed 130 complaints with NHTSA about the 2018 Mercedes-Benz C-Class. The most-reported areas: Engine (39), Unknown Or Other (27), Structure (19).
Key takeaways
- 130 owner complaints on file with NHTSA.
- 5 involve a crash, 0 a fire, 2 reported injuries.
- Complaints are unverified owner reports; recalls are confirmed defects.
| Component | Complaints | Share |
|---|---|---|
| Engine | 39 | 30% |
| Unknown Or Other | 27 | 21% |
| Structure | 19 | 15% |
| Steering | 13 | 10% |
| Electrical System | 12 | 9% |
| Fuel/Propulsion System | 9 | 7% |
| Power Train | 6 | 5% |
| Tires | 5 | 4% |
| Communication | 5 | 4% |
| Wheels | 5 | 4% |
| Air Bags | 5 | 4% |
| Forward Collision Avoidance | 4 | 3% |
One complaint can name several components, so shares add up to more than 100%.
| Version | Overall | Front | Side | Rollover |
|---|---|---|---|---|
| 2018 Mercedes-Benz C-Class 4 DR 4WD | 5/5 | 4/5 | 5/5 | 4/5 |
| 2018 Mercedes-Benz C-Class 4 DR RWD | 5/5 | 4/5 | 5/5 | 4/5 |
| 2018 Mercedes-Benz C-Class 2 DR RWD | Not rated | Not rated | Not rated | Not rated |
| 2018 Mercedes-Benz C-Class 2 DR 4WD | Not rated | Not rated | Not rated | Not rated |
Latest complaints, as filed
Owner-written and unverified by NHTSA.
Structure - filed 2026-09-16
Front roof panel came detached at hwy speed
Unknown Or Other - filed 2026-08-28
Sunroof causing dangerous pinch conditions. Roof tracks break and cause pinch areas with partial opening of roof
Structure - filed 2026-08-26
The contact owns a 2018 Mercedes-Benz C-300. The contact stated that while driving 70 MPH South on the interstate towards Miami, the front panel detached without warning. The contact pulled over to inspect the vehicle and became aware that the panel between the windshield and sunroof had detached. The contact stated th...
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More for the 2018 Mercedes-Benz C-Class
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.