2021 Mercedes-Benz C300 Fuel system Problems
- Complaints
- 3about this part
- Share
- 21%of 14 total for the year
- Median mileage
- 60,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 3 complaints about the fuel system of the 2021 Mercedes-Benz C300, 21% of the 14 complaints for this model year. Where a mileage was given, the median is 60,000 miles. 1 recall campaign on record is filed under a similar system.
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.
“My car had a coolant leak last year a hose broke and I have a 2021. My son’s mercedes sis the same thing on 11/23/2025. I have researched ma y others with this same issue. There should be a recall on that hose or whatever the problem Is.”
NHTSA complaint #11701496, filed 2025-11“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 manufacturer was made aware of the issue. The approximate failure mileage was 60,000.”
NHTSA complaint #11738727, filed 2026-05, 60,000 miles“While driving car on Sunday 10/5, it suddenly failed to respond to gas pedal pressure. The car stopped accelerating and rather slowed to 15 MPH, almost causing a car from behind to hit me in the rear side.”
NHTSA complaint #11691568, filed 2025-10Related recalls
- 23V445000Jun 26, 2023Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2021-2023 C-Class, E-Class, S-Class, CLS, SL, GT, GLC, GLE, GLS, and G-Class vehicles. Please refer to…Covers: Mercedes-Benz C300 2021–2023, GLC 300 2021–2023, AMG G63 2021–2023 +37 more
Related 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
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 2021 Mercedes-Benz C300
8 complaintsAir bags
1 complaintsBack-over prevention (rear camera)
1 complaintsElectrical system
1 complaintsTransmission and drivetrain
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaints
← All problems reported for the 2021 Mercedes-Benz C300
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 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