repaired · 2025 Q4
Body: roof and pillars
Risk. A detached roof panel can become a road hazard, increasing the risk of a crash.
2020 Mercedes-Benz C300Problems, recalls & complaints
NHTSA has logged 34 owner complaints about the 2020 Mercedes-Benz C300, most often about the engine. It is covered by 9 safety recalls, and for recall 23V-854 the manufacturer reports only 41% of affected cars repaired.
Source: NHTSA complaints, recalls, investigations and manufacturer recall reports, through November 3, 2026. Updated daily. Photo: Vauxford, CC BY-SA 4.0.
Complaints by system
Where the 2020 Mercedes-Benz C300 has problems
34 complaints grouped by the system owners reported.
8Engine
4Structure1 crash/fire/injury
4Power train
3Visibility
3Electrical system1 crash/fire/injury
3Forward collision avoidance1 crash/fire/injury
3Fuel/propulsion system
2Latches/locks/linkages
2Back over prevention
117 other systems2 crash/fire/injury
| System | Complaints | Crash, fire or injury |
|---|---|---|
| Engine | 8 | 0 |
| Structure | 4 | 1 |
| Power train | 4 | 0 |
| Visibility | 3 | 0 |
| Electrical system | 3 | 1 |
| Forward collision avoidance | 3 | 1 |
| Fuel/propulsion system | 3 | 0 |
| Latches/locks/linkages | 2 | 0 |
| Back over prevention | 2 | 2 |
| 7 other systems | 11 | 2 |
Source: NHTSA Office of Defects Investigation. Complaints are submitted by the public and are not verified by NHTSA.
9 recalls
2020 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 Q4
Exterior lighting: headlights
Risk. Incorrectly adjusted headlights may reduce visibility, increasing the risk of a crash.
Show 5 more recalls
repaired · 2023 Q3
Body: roof and pillars
Risk. The adhesive bonding of the front panel might deteriorate, possibly causing the front panel to detach from the vehicle and become a road hazard, increasing the…
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…
repaired · 2022 Q3
Gasoline: turbo/supercharger
Risk. An oil leak in the presence of an ignition source such as hot engine or exhaust components can increase the risk of a fire.
repaired · 2022 Q1
Communication
Risk. An inaccurate vehicle location may delay emergency responders, increasing the risk of injury.
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
2020 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
1 investigation
NHTSA defect investigations
Federal investigations that included the 2020 Mercedes-Benz C300, and the recalls they led to.
- Front Roof Panel DetachmentLed to recall 21V-197
In owners' words
What C300 owners report
Recent engine complaints filed with NHTSA, shortened. Personal details are removed.
Vehicle has ongoing and recurring electrical and engine-related defects that affect safe operation. The primary systems involved are the electrical system, engine ignition system, and powertrain. The vehicle is available for inspection upon request. Prior service records show issues beginning in…
The contact owns a 2020 Mercedes-Benz C300. The contact stated that while at a stop, the vehicle failed to accelerate as intended. There was no warning light illuminated. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure and…
I am reporting a catastrophic repeat engine failure on my 2020 Mercedes-Benz C300. On October 9, 2025, with 26,589 miles, the vehicle suffered a Cylinder 2 failure (exhaust valves), causing a dangerous loss of power in traffic. I paid $4,100.43 for a $10,000 plus cylinder head replacement at an…
Own a 2020 C300?
Decode your VIN to see the recalls for your exact car, then confirm open recalls with NHTSA.