Which parts fail
Components named in complaints (engine, cooling system, oil leaks, timing chain, exhaust).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2014 Mercedes-Benz C250 owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2014 Mercedes-Benz C250. The contact stated while driving 60-62 MPH, the vehicle lost motive power. The check engine warning light, the traction control warning light, and other unknown warning lights were illuminated. The contact veered to the side of the road. The contact was able to restart the vehicle after several attempts. The contact was able to continue driving. The dealer was notified of the failure and referred the contact to AutoZone. The vehicle was taken to AutoZone, where it was diagnosed that the fuel injectors and the ECM had failed. The contact sent a diagnostic report to the used car dealer where the vehicle was purchased, but no assistance was provided. Additionally, the contact stated that the control arm had fractured. The vehicle was not repaired. The dealer and manufacturer were not notified of the failure. …
The contact owns a 2014 Mercedes-Benz C250. The contact stated that the vehicle was getting water inside the cabin from a leak coming from the sunroof. The contact stated that while driving at various speeds, the vehicle started jerking and making a choking sound as if the vehicle was going to shut off. The check-engine warning light was illuminated. The vehicle was taken to the dealer who determined that there was an electrical failure related to the leak coming from the sunroof leak and that there were corroded cam blocks. The cable for the sunroof was replaced along with the mats on the floor. The contact was unsure if the engine was repaired. The contact stated that the check engine warning light was intermittently illuminated, and the jerking of the vehicle persisted. The manufacturer was not made aware of the failure. The approximate failure mileage was 54,315.
My Mercedes Benz 2014 W204 C250 initially had a noise during startup. The startup noise became louder and now my car does not start. Also, the check engine light indicate a cam shaft position sensor error. Looking online it appears that my problem is exactly like the problem described in a NHTSA report on 2012-2015 W204 and W172 vehicles(C250 and SLK250) equipped with the M271 engine. I would like NHTSA assistant in getting my Mercedes Benz W024 C250, VIN [redacted] included as part of extended recall of the same car and engine and repaired. If more information is needed, please contact me. [redacted]
The contact owns a 2014 Mercedes-Benz C250. The contact stated that upon starting the vehicle, an abnormal rumbling noise was detected. The vehicle had hesitated to start. The engine warning light was illuminated. The vehicle was taken to the local dealer, where it was diagnosed that the timing chain tensioner needed to be replaced. The vehicle was not repaired. The manufacturer was contacted, but no assistance was provided. The failure mileage was approximately 56,000.
I was driving on the highway my car sort of hesitated for a brief second then continued on as if nothing about one mile later my car began to slow down while I was in traffic so asap I pulled over at this point I could only go about 40 miles per hour which was very terrifying at that time it came a complete stop. After restarting the car 3-4 times it stayed running I continue home which was about 12 miles from my current location. For the next few days I did not go any where. I then had an appointment to have the 80,000 mile maintenance I mentioned the problem I was then told I need a throttle body replacement costing more than $2000 that I can not afford. At that time I started researching my own problem. My relative who works on 18 wheel truck for a living, . that perhaps it just may need cleaning rather than replacement . …
I was trying to merge onto a freeway from a complete stop and because this freeway has an extremely short on-ramp, you need to get up to a high speed in very little time. As such, I put my car in Sport driving mode and accelerated very hard from a complete stop. The car accelerated as normal for a few seconds (I reached approximately 40 to 50 MPH), then I felt the car lag and felt a loss of power. The car was in limp mode and I couldn't accelerate even though I was pressing the gas pedal all the way to the floor. A few seconds after this occurred, I notice that the check engine light turned on. I was able to maintain a speed around 50 MPH and got off the freeway. I took my car to both the Mercedes dealership and an independent mechanic and both diagnosed a failure of the high pressure fuel pump. …
The Cam Shaft and the boost pressure need to be replaced immediately. I took my car to a Mercedes Benz dealership in Long Island, NY for a regular oil change (nothing was wrong with my car when it went in for the oil change). When they gave me back my car I literally got 1 and half blocks from the dealership and my car was jerking violently and the check engine light came on and has not gone off since that day. I took the car right back to the dealership and of course they are saying they did nothing to make this happen and are refusing to cover the repairs for the Cam Shaft and boost pressure to make my car run correctly again. This is a dangerous car to drive now because due to this same problem the car has random issues accelerating and has put me in dangerous situations while driving on the highway and on the street. …
On December 14, 2022 at approximately 3:45 pm in rush hour traffic in the high speed lane on i-75 in Bradenton, Fl, the 2014 Mercedes C250 I was driving lost total engine power, traveling from 80mph to 0 in seconds. I had just enough time because of the momentum of the speed I was traveling at to maneuver the car into the breakdown lane adjacent to a median construction site. Had I been traveling in the middle lane there would have been insufficient time to change lanes in heavy, fast traveling traffic and get to a breakdown lane. In other words, we could have been killed. There was no check engine light nor warning lights of any kind. The engine was quiet and there was no engine rattling noise or shuddering prior to the incident during over 7 hours of travel from Marietta, Georgia into Florida. …
I was coming off the freeway on 9/25/25, and when I pressed on the breaks they completely locked up and would not break at all. The car turned off, no warning lights nothing, and I continued to hit the break and the car would not stop, then all of a sudden it came to a stop almost colliding within inches of hitting the Semi-Truck in front of me. This is the second time in one year that this has happened to me, I have had the car checked out the first time last year immediately, and even paid to diagnose it, nothing, I had the brakes and rotors replaced last June of 2024 when this happened. Since then the car has only been in the dealership to get the car Fully checked out mutltiple times within 2024, 2025 and repaired by Mercedes dealership. …
Tl* the contact owned a 2014 Mercedes-Benz c250w. While driving approximately 40 MPH, the vehicle began to decelerate on its own and the check engine indicator illuminated. The failure recurred. The vehicle was taken to Mercedes-Benz of palm beach (4000 okeechobee blvd, west palm beach, fl 33409, [phone]) where it was diagnosed that the fuel pump needed to be replaced. The vehicle was repaired. While driving back home at approximately 30 MPH, the driver heard a hissing sound and dark smoke gushed from underneath the hood without warning. The vehicle was pulled over to the side of the road. Flames approximately seven feet high poured out from the hood and engulfed the entire vehicle. The police and fire departments were called to the scene. The fire was extinguished by the fire department. There were no injuries and a police report was not filed. …
Engine complaints in other C250 years
Frequently asked questions
How common are engine problems on the 2014 Mercedes-Benz C250?
NHTSA has 23 complaints about the engine & cooling of the 2014 Mercedes-Benz C250, 14% of the model year's 163 complaints. The component named most often is engine › engine control module (ecu/ecm) (1 mentions).
Is there a recall for 2014 Mercedes-Benz C250 engine problems?
No. NHTSA lists no engine & cooling recall for the 2014 Mercedes-Benz C250, though it has 5 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2014 Mercedes-Benz C250 engine problems start?
Half of the complaints with a recorded mileage happened before about 54,000 miles, and 20% before 25,000 miles.
Is it dangerous?
Owners linked 0 crashes, 2 fires and 0 injuries to engine & cooling problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.