2020 Mercedes-Benz C300 Fuel system Problems
- Complaints
- 3about this part
- Share
- 9%of 33 total for the year
- Median mileage
- 87,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 3 complaints about the fuel system of the 2020 Mercedes-Benz C300, 9% of the 33 complaints for this model year. Where a mileage was given, the median is 87,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The fuel smell is coming from the rubber fuel, they are not cover by my cpo- warranty ( 3000 usd paid package). I found over 100 friends on facebook group has the same problems. Dealler refuse to cover. My kid is fell bad about the smell leaking.”
NHTSA complaint #11390106, filed 2021-01, 87,000 miles“The component that failed was the fuel injector and spark plug. A few months prior to this incident, I was making a left hand turn, when the accelerator completely gave out. I was making the left on a blinking yellow arrow, luckily the on coming car was not coming at me fast or I would've been in an accident due to the accelerator failing. I had to pull over, turn the car off and then back on to reset it. I was told by the dealership service center that they could not find anything and that there have been no complaints or recalls. …”
NHTSA complaint #11490902, filed 2022-10“I purchased this 2020 Mercedes-Benz C300 only two months ago and have driven it less than 3,000 miles. The Carfax report shows consistent maintenance and regular service history by prior owners. While driving, the check engine light came on and the vehicle began shaking and running roughly. Diagnostics by Peachtree Imports (10/03/2025) and later by Mercedes-Benz of Atlanta South confirmed Cylinder #2 failure on the M264 2.0L engine at only 26,589 miles. The dealer’s report states: “Cylinder #2 mixture formation out of spec. Fault occurred due to worn exhaust valve seat. …”
NHTSA complaint #11695702, filed 2025-10Related service bulletins
- 11036999Aug 15, 2026Dear Mercedes-Benz Owner: In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA…
- 11035490Jul 31, 2026This NCU replaces the prior NCU issued on May 15, 2025, and contains additional MY 2023 and MY 2024 vehicles which are highlighted below.
- 11019016May 30, 2025In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA is extending the warranty…
- 11018625May 15, 2025In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA, LLC (“MBUSA”) is…
- 11014402Feb 21, 2025Complaint Customer-perceived problem: • Fuel gauge reading implausible • MIL ON (market-dependent) N118/3 Fault codes in control units FSCM_GEN4/5/6 • For these fault codes, the…
- 11013179Jan 24, 2025Complaint Customer-perceived problem: • Fuel gauge reading implausible • MIL ON (market-dependent) N118/3 Fault codes in control units FSCM_GEN4/5/6 • For these fault codes, the…
- 10205814Aug 11, 2021Fuel filler flap opens slowly/switch flashes/tank is bleeding instrument cluster warning
- 10178712Jul 2, 2020Message in the Instrument Cluster "Refill 1L Oil at the Next Fuel Stop"
- 10178711Jul 1, 2020Message in the Instrument Cluster "Refill 1L Oil at the Next Fuel Stop"
Fuel system: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2023 | 1 | 5% |
| 2022 | 7 | 28% |
| 2021 | 3 | 21% |
| 2020 | 3 | 9% |
| 2019 | 12 | 17% |
| 2018 | 10 | 10% |
| 2017 | 33 | 15% |
| 2016 | 67 | 23% |
| 2015 | 70 | 18% |
| 2014 | 1 | 1% |
| 2013 | 3 | 1% |
| 2012 | 12 | 4% |
| 2011 | 44 | 9% |
| 2010 | 26 | 6% |
| 2009 | 5 | 1% |
| 2008 | 2 | 0% |
Other parts of the 2020 Mercedes-Benz C300
8 complaintsOther or unknown
5 complaintsBody and structure
4 complaintsElectrical system
3 complaintsForward collision avoidance
3 complaintsTransmission and drivetrain
3 complaintsVisibility (wipers, defrost, mirrors)
3 complaintsAir bags
2 complaintsBack-over prevention (rear camera)
2 complaintsLatches, locks and linkages
2 complaintsSteering
2 complaintsTires
2 complaints
← All problems reported for the 2020 Mercedes-Benz C300
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Nov 1, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology