2019 Mercedes-Benz C300 fuel system problems

Filed Nov 6, 2026 · Engine, Fuel system · NY

A 55,000 miles vehicle - escalated to a $10,000. repairs - Coolant Leakage and SOLENOID related issues - the mental duress and stress from a unreasonable cost and seriousness of repaire requireements as the car got just out of the warranty period.

Filed Dec 22, 2025 · Engine, Fuel system · FL

This vehicle was brought to an authorized Mercedes-Benz dealership for regularly scheduled maintenance. Shortly after this service, the vehicle began experiencing significant issues including difficulty accelerating, engine hesitation while driving, and noticeable shaking at idle. This car has never overheated. The vehicle was returned to the dealership for inspection. The dealership diagnosed a cracked cylinder head and advised that the repair requires replacement of the cylinder head at an estimated cost of approximately $11,000. The failed component is available for inspection and the vehicle is currently at the dealership. The vehicle has approximately 46,000 miles, has been regularly maintained, garaged, and driven under normal conditions. These symptoms created engine performance issues that could result in loss of power or inability to accelerate while driving, creating a potential safety risk, especially in traffic or at highway speeds. I regularly transport my young grandchild in this vehicle. The possibility of sudden engine failure, loss of power, or breakdown while driving raises significant safety concerns for myself and any passengers, particularly a young child. The failure has been confirmed by an authorized Mercedes-Benz service center. During my own research, I discovered there have been recalls involving similar engines for the same model year, as well as multiple owner complaints reporting similar engine or cylinder head failures on this vehicle. I contacted Mercedes-Benz customer care on December 17, 2025, after receiving the dealership diagnosis, and was advised that I would receive a response within 72 hours. As of today, I have not received any response. I attempted to call customer care again, but the phone system would not accept a voicemail and no representative answered. My case number with Mercedes-Benz is 19653254. No prior abuse, misuse, or abnormal driving conditions occurred. The vehicle was properly maintained.

Filed Sep 18, 2025 · Fuel system · 157,000 miles · RI

The contact owns a 2019 Mercedes-Benz C300. The contact stated that while driving at various speeds, the vehicle suddenly lost motive power and decelerated. The accelerator pedal was depressed while attempting to accelerate. The contact stated that the fuel gauge failed to accurately display the level of fuel in the tank. The check engine warning light was intermittently illuminated. The vehicle was taken to the dealer, who diagnosed that the fuel level sensors had failed. The fuel tank and fuel pump needed to be replaced. The vehicle was not repaired. The contact became aware of the federal safety agency Campaign Numbers: 23V880000 (Fuel System, Gasoline), and 23V445000 (Fuel System, Gasoline); however, the model year was not included. The manufacturer was informed of the failure. The manufacturer referred the contact to the federal safety agency Hotline to report the failure. The failure mileage was approximately 157,000.

Filed Apr 25, 2025 · Engine, Fuel system · 60,000 miles · NC

The contact owns a 2019 Mercedes-Benz C300. The contact stated that while at a stoplight, there was an abnormal odor of fuel inside the vehicle. The contact stated that the vehicle failed to respond as needed. The vehicle was restarted and shut off independently. The check engine warning light was illuminated. The contact stated that the failure was related to the federal safety agency Campaign Number: 21V961000 (Fuel System, Gasoline). The vehicle was towed to an independent mechanic who determined that the failure was a fuel rail failure. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted and confirmed there were no open recalls on the VIN. The failure mileage was approximately 60,000.

Filed Mar 17, 2025 · Engine, Fuel system · NC

Po52E71- Emissions issue with crankcase. Mercedes implemented an extended warranty on various models but excluded 2019 C300, which definitely has the same issues. See below in reference to previous models. IMPORTANT EMISSION EXTENDED WARRANTY INFORMATION In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA, LLC (“MBUSA”) is extending the warranty coverage on the intake line assembly in certain Model Year (“MY”) vehicles listed below from the original New Vehicle Limited Warranty of 4 years/50,000 miles to 15 years/150,000 miles (whichever occurs first) due to the following condition: • Under certain circumstances, the partial-load ventilation valve (a part of the intake line assembly) may not work as intended, resulting in the illumination of the check engine Malfunction Indicator Lamp (‘MIL’). A faulty partial-load ventilation valve might also increase exhaust gas emission. Model Model Years Sales Designation C-Class 2015 – 2018 C 300, C 300 4MATIC C-Class Convertible 2017 – 2018 C 300 Convertible, C 300 4MATIC Convertible C-Class Coupe 2017 – 2018 C 300 Coupe, C 300 4MATIC Coupe C-Class Hybrid 2016 – 2018 C 350e E-Class 2017 – 2019 E 300, E 300 4MATIC GLC 2016 – 2019 GLC 300, GLC 300 4MATIC GLC Coupe 2017 – 2019 GLC 300 4MATIC Coupe GLC Hybrid 2018 – 2020 GLC 350e 4MATIC SLC 2017 – 2020 SLC 300 SLK 2016 SLK 300

Filed Jan 2, 2025 · Fuel system · CA

Leaking fuel as described in one of the previous recalls for the car. There is a fire hazard but the VIN is not listed as being eligible.

Filed Nov 12, 2024 · Fuel system · 34,945 miles · CA

The contact owns a 2019 Mercedes-Benz C300. The contact stated while driving, the vehicle failed to exceed 15 MPH. The check engine warning light was illuminated. The vehicle was taken to an independent mechanic to be diagnosed. The vehicle was scanned, and the mechanic retrieved fault codes indicating a failure with the high-pressure fuel pump. The contact was informed that the high-pressure fuel pump needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 34,945.

Filed Aug 29, 2024 · Fuel system · VA

Gas smell coming from engine area when car has been sitting overnight. Smell comes from driver's side of engine compartment. Gas smell does not happen when car is running. Smell fills up our 2-car garage causing concern when we start the car in the morning.

Filed Feb 29, 2024 · Fuel system · 76,000 miles · FL

The contact owns a 2019 Mercedes-Benz C300. The contact stated while driving 45 MPH, the contact noticed smoke coming from the front passenger's side wheel well. The vehicle was driven to the residence. Upon arriving at the residence, the contact raised the hood, and became that clear liquid was burning on the engine. The contact stated that after completing an investigation, it was determined that the clear liquid was the result of a leaking fuel line. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 76,000.

Filed Feb 28, 2024 · Acceleration, Brakes · CA · crash

On the afternoon of February 6, 2024, as I was turning into my driveway to park in front of the garage, my car unexpectedly accelerated despite my foot being on the brake pedal. Despite my attempts to brake, the pedal didn't respond, causing the car to collide with the garage door and subsequently damage storage shelves and containers inside. My mother and two brothers were passengers, returning from my mother's doctor appointment, and she became trapped inside due to the garage door collapsing onto the car. Emergency services were called, and both the fire department and police assisted in freeing my mother from the vehicle. However, the police did not file an accident report since it occurred on private property. Subsequently, I contacted my insurance agent, and the car was towed to a repair shop recommended by the dealer. Today, I was informed by the repair shop that the damages are extensive enough for the car to be considered totaled by the insurance company. Fortunately, the incident did not occur while driving on the freeway or public roads earlier that day, potentially averting a more serious accident. Nevertheless, the ordeal has caused considerable stress and sleep loss for all involved. I have since reached out to the repair shop and dealer to conduct a thorough diagnostic analysis to determine the cause of the malfunction. I've requested copies of the data captured by the On-Board Diagnostics (OBD) system and Event Data Recorder (EDR), emphasizing that this data should not be deleted without my consent. However, I am uncertain about the next steps if the insurance company removes the car from the repair shop and how to access the requested data. Upon researching online, I've discovered numerous similar cases involving Mercedes-Benz cars, with over 20 incidents reported and 11 specifically concerning the same model as mine.