repaired · 2025 Q2
Delivery: fuel pump
Risk. A loss of drive power can increase the risk of a crash.
2021 Mercedes-Benz C300Problems, recalls & complaints
NHTSA has logged 15 owner complaints about the 2021 Mercedes-Benz C300, most often about the engine. It is covered by 7 safety recalls, and for recall 22V-232 the manufacturer reports only 89% of affected cars repaired.
Source: NHTSA complaints, recalls, investigations and manufacturer recall reports, through October 30, 2026. Updated daily. Photo: SsmIntrigue, CC BY-SA 4.0.
Complaints by system
Where the 2021 Mercedes-Benz C300 has problems
15 complaints grouped by the system owners reported.
9Engine
2Fuel/propulsion system
1Electrical system
1Fuel system, gasoline
1Power train
1Air bags
1Visibility
1Back over prevention
| System | Complaints | Crash, fire or injury |
|---|---|---|
| Engine | 9 | 0 |
| Fuel/propulsion system | 2 | 0 |
| Electrical system | 1 | 0 |
| Fuel system, gasoline | 1 | 0 |
| Power train | 1 | 0 |
| Air bags | 1 | 0 |
| Visibility | 1 | 0 |
| Back over prevention | 1 | 0 |
Source: NHTSA Office of Defects Investigation. Complaints are submitted by the public and are not verified by NHTSA.
7 recalls
2021 Mercedes-Benz C300 recalls and how many were fixed
Each ring shows the share of affected cars repaired, from the manufacturer’s latest quarterly report to NHTSA. Recall repairs are free at authorized dealers.
repaired · 2026 Q2
Communication: auto crash notification
Risk. A disabled eCall system would prevent a vehicle occupant from contacting the emergency services call center in an emergency, potentially delaying emergency…
repaired · 2024 Q2
Back over prevention: display function
Risk. An inoperable rearview camera display reduces the driver's rear view, increasing the risk of a crash.
repaired · 2023 Q2
Mid/rear assembly: head restraint
Risk. Incorrectly mounted headrests could move or detach from the seat during a crash, increasing the risk of injury.
Show 3 more recalls
repaired · 2023 Q1
Sensor: occupant classification
Risk. Air bags and seat belts that do not perform properly in a crash can increase the risk of injury.
repaired · 2023 Q4
Communication: auto crash notification
Risk. Failure of the eCall system may result in emergency responders being dispatched to the wrong location, increasing the risk of injury following a crash.
repaired · 2022 Q4
Front: retractor
Risk. If the seat belt does not fully retract, the occupant may find the operation of the seat belt inconvenient and not wear it, increasing the risk of injury in…
Recalls apply to specific cars. To see whether a recall is still open on yours, enter the 17-character VIN at nhtsa.gov/recalls or with Mercedes-Benz.
Best & worst years
2021 vs. every other C300 year
Bars show complaints per model year. Colors show the CarFlaw verdict: complaints weighted for crashes, fires and injuries, adjusted for years on the road and compared with the C300 median. How we score
'08'09'10'11'12'13'14'15'16'17'18'19'20'21'22'23'24'25'26
- Avoid
- Caution
- Solid
- Best
- Not rated
In owners' words
What C300 owners report
Recent engine complaints filed with NHTSA, shortened. Personal details are removed.
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…
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…
The contact owns a 2021 Mercedes-Benz C300. The contact stated that while driving at an undisclosed speed, the vehicle stalled and failed to exceed 30 MPH, with the check engine warning light illuminated. The vehicle did not require a restart. The contact also stated that while stopped at a traffic…
Own a 2021 C300?
Decode your VIN to see the recalls for your exact car, then confirm open recalls with NHTSA.