2021 Mercedes-Benz C-Class problems and complaints
Owners have filed 16 complaints with NHTSA about the 2021 Mercedes-Benz C-Class. The most-reported areas: Engine (9), Power Train (2), Air Bags (2).
Key takeaways
- 16 owner complaints on file with NHTSA.
- 0 involve a crash, 0 a fire, 0 reported injuries.
- Complaints are unverified owner reports; recalls are confirmed defects.
| Component | Complaints | Share |
|---|---|---|
| Engine | 9 | 56% |
| Power Train | 2 | 13% |
| Air Bags | 2 | 13% |
| Fuel/Propulsion System | 2 | 13% |
| Fuel System | 1 | 6% |
| Gasoline | 1 | 6% |
| Visibility | 1 | 6% |
| Suspension | 1 | 6% |
| Back Over Prevention | 1 | 6% |
| Electrical System | 1 | 6% |
One complaint can name several components, so shares add up to more than 100%.
Parts for the 2021 Mercedes-Benz C-Class
GarageDex's verified specs for this car. Each Buy button searches Amazon for that exact part.
- Battery
- Engine oil
- Cabin air filter
- Wiper blades
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| Version | Overall | Front | Side | Rollover |
|---|---|---|---|---|
| 2021 Mercedes-Benz C-Class 2 DR RWD | Not rated | Not rated | Not rated | Not rated |
| 2021 Mercedes-Benz C-Class 4 DR RWD | 5/5 | 4/5 | 5/5 | 4/5 |
| 2021 Mercedes-Benz C-Class 2 DR 4WD | Not rated | Not rated | Not rated | Not rated |
| 2021 Mercedes-Benz C-Class 4 DR 4WD | 5/5 | 4/5 | 5/5 | 4/5 |
Latest complaints, as filed
Owner-written and unverified by NHTSA.
Engine - filed 2026-10-30
I am reporting a potentially serious safety problem involving sudden loss of engine power and an unresponsive accelerator. On August 30, 2026, while I was driving on the highway with my child in the vehicle, the engine suddenly stopped producing power. Pressing the accelerator did not restore normal acceleration. The v...
Engine - filed 2026-08-07
The contact owns a 2021 Mercedes-Benz C 300. The contact stated that while depressing the accelerator pedal, there was a loud knocking sound coming from the engine compartment while accelerating. There were no warning lights illuminated. The vehicle was taken to the dealer to be diagnosed, and it was determined that th...
Fuel System, Gasoline - filed 2026-05-19
The contact owns a 2021 Mercedes Benz C. The contact stated that while driving on the highway, the vehicle began to lose power, riding rough. The check engine light illuminated. The vehicle was towed to the dealer where it was diagnosed with a fuel injection failure. The vehicle read diagnostic code P1CEF85. The m...
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More for the 2021 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.