The contact owns a 2015 Mercedes-Benz C300. The contact stated that while driving approximately 50-60 MPH, the #1 piston cracked. The contact stated that while his daughter was driving, the vehicle was shaking and smoking. The check engine warning light illuminated. The vehicle was towed to an independent mechanic and the contact was informed that the #1 piston was cracked, engine cooler, P0301 cylinder #1, P219 solenoid failure. The vehicle was taken to another independent mechanic and the engine was replaced. The contact called the local dealer, but the vehicle was not diagnosed or repaired. The manufacturer was notified of the failure, but no further assistance was provided. The failure mileage was approximately 105,102.

- Stockton, CA, USA

Check engine light came on. Code P052E. Had this code in 2018 and the pcv valve and line were changed. Currently has the same issue 3 years later. This is a very common problem with mercedes that have this engine.

- Smithtown, NY, USA

The engine stalled at idle numerous times when at a stop light or stop sign. This was dangerous as the other cars could have ran into my car in anticipation that I should be moving with traffic. The car was taken to the Mercedes Marin dealer service center and diagnostic was done indicating a cracked piston in cylinder one was causing loss of compression and could also cause engine failure at speed if not taken care of. Check engine light DID NOT come on. During research on repairs for this issue, it became apparent that Mercedes Benz is aware of this issue in many of its engines of this model and year, but did nothing to remedy the situation or the underlying manufacturing defect that causes the cracked piston. In addition, Mercedes is unwilling to cover the cost of repair or replacement (car has only. 49,000 miles, but is out of warranty due to age).

- San Rafael, CA, USA

In March of 2020 I was driving home from work. I stopped at a red light. When it turned green, I proceeded to step on the gas. My car started making noises and shaking as I drove. My check engine light came on. I was able to pull over without incident. My vehicle has under 48k miles on it! I had it towed to a Firestone facility by my house. They replaced spark plugs and ignition coil 1 and 2. They said it was still severely misfiring. Cylinder 1 must have internal damage and should be towed to the dealer. They gave me a spark plug they removed that had significant damage to the top part. They said something must have impacted it with significant force. I then had the vehicle towed to a Mercedes Benz Dealership. They said they inspected with a scope and found piston material missing, can see ring exposed and have damage to cylinder wall. Will need to replace engine, turbo charger, cat converter intake manifold to repair. They wanted $18k to repair. I did some research and found out that the 2015 Mercedes C class was the first year they switched from 6 cylinder to 4 cylinder turbo charge engine. These models have had a significant amount of engine problems and failures, the manufacturer is aware of. Many of these occurred in cylinder 1 along with wrist pins issues and others. I found my situation wasn't unique. I then filed a complaint with The BBB in Georgia. MBUSA offered me $3k towards the repair or purchase of a new vehicle. I declined the offer. I only wanted my vehicle repaired. I wasn't alone in this situation. These issues are easily found online. My vehicle has since been sitting in my driveway for almost a year and a half. I've been making my monthly car and insurance payments on a vehicle I can't drive. I recently went to the Mercedes dealership and they will give me $5k for the vehicle towards a trade, leaving me with $15k negative equity towards the purchase of a vehicle. Mercedes should stand behind their products and do the right thing

- Latham, NY, USA

I was in middle line on I-5 SB San Diego doing 40-60MPH when my car suddenly started to shudder, shake and smoke came from the exhaust. The car lost power and the check-engine light came on right away. I was told that Cylinder 3 lost pressure, that the engine wall was damaged and that possibly the piston and wrist pin are cracked. My car has only 66K miles and the Mercedes Benz dealership is telling me that I need a new engine that will cost $19,000. After doing some research I have found out that I wasn't the only one with this issue. I have listed an example here: "HERE IS A MAJOR ISSUE WITH THE 2015 M274 MERCEDES ENGINE REGARDING THE WRIST PINS. MERCEDES HAS ISSUED NUMEROUS INTERNAL SERVICE BULLETINS ABOUT THE ISSUE. THE ENGINES WERE MANUFACTURED WITH WRIST PINS WITH TOO MUCH TOLERANCE THAT SLAP AGAINST THE PISTON WHEN OPERATING THAT COULD LEAD TO PREMATURE ENGINE FAILURES. THERE ARE HUNDREDS OF COMPLAINTS ON ONLINE FORUMS OF PREMATURE ENGINE FAILURES (PRE 100K MILES)." MBUSA requested from me proof that the car was serviced on time and with the correct parts. Once I was able to prove everything they told me that they were sorry but I still need to pay for everything. They did offer a "10% good-will discount". I wish they told me when I was buying a car that after every 6th oil change I will need a new engine. PLEASE MAKE MERCEDES MAKE THIS RIGHT AND FIX THE AFFECTED CARS THE RIGHT WAY.

- La Jolla, CA, USA

check engine light and check oil light came on in rush hour traffic in atlant during rush hour. Car started sputtering and finally made it to the shoulder of the interstate and oil was low on the dip stick. I added oil and a day later same thing. Took it to the dealer and cracked piston in #1 cylinder service guy said about 3 to 6 a day on this year benz.

- Columbus, GA, USA

The car has intermittent starting issues more noticeably during eco start / stop process. When car does an eco stop at red light or stop but it is unable to restart consistently (10-20% fail rate). All dashboard lights come on and car is stalled. Car can roll if on a hill. Car can be restarted by turning car on and off manually. Only error code is P1ce200 but the manufacturer suggested steps do no solve problem. Battery, auxillary battery, starter, voltage dip limiter, battery sensor, starter relay were replaced. Delear unable to find problem and says all software is up to date.

- Hazlet, NJ, USA

Check engine light keeps coming on/ fowl order coming from ac unit/ loud gas smell when start ignition in the morning

- Ellenwood, GA, USA

The contact owns a 2015 Mercedes-Benz C300. The contact stated that the vehicle was recently in an accident. The vehicle was repaired at gerber collision & glass (102 corporate park dr, henderson, nv 89074) however, while leaving the collision center, the contact heard a loud knocking sound coming from underneath the vehicle. The contact asked the collision center to inspect the vehicle for the sound however, the collision center declined. The contact then took the vehicle to Mercedes-Benz of henderson service center (925 auto show dr, henderson, nv 89014) to be inspected. The vehicle was not yet diagnosed nor repaired. The manufacturer was made aware of the failure. The failure mileage was 55,321.

- Henderson, NV, USA

The contact owns a 2015 Mercedes Benz C300. The contact stated that while operating the vehicle, the check engine light remained illuminated with an abnormal sound coming from the engine. In addition, while driving the vehicle would not properly accelerate and unintentionally decelerated while sputtering. The vehicle was towed to the local dealer Mercedes Benz of wilmington located at 3801 lancaster pike, wilmington, de 19805 to be diagnosed. The contact was informed that the engine was faulty and needed to be replaced. The vehicle was not yet repaired. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 80,000.

- Bear, DE, USA

Cylinder one cracked under normal use

- Irvine, CA, USA

The contact owns a 2015 Mercedes-Benz C300. The contact stated that the check engine warning light was illuminated. The vehicle was taken to the local dealer Mercedes-Benz of los angeles (1801 S figueroa St, los angeles, ca 90015, (213)425-3100) and the mechanic was unable to duplicate the failure. The vehicle had not been repaired as of yet. The manufacturer had been informed of the failure. The failure mileage was approximately 78,000.

- Los Angeles, CA, USA

There is a major issue with the 2015 M274 Mercedes engine regarding the wrist pins. Mercedes has issued numerous internal service bulletins about the issue. The engines were manufactured with wrist pins with too much tolerance that slap against the piston when operating that could lead to premature engine failures. There are hundreds of complaints on online forums of premature engine failures (pre 100K miles). I contacted Mercedes and they refuse to do anything to fix this problem the repair is well over $8,000 and the average person just can not afford it. You diagnose the problem based on chatter during deceleration. Please make Mercedes make this right and fix the affected cars the right way. I just bought this car and I am now in the hole over $20,000

- Stamford, CT, USA

Every time I start my car it smells like gas and it's so strong to the point where it gives me headaches. Also I was on the freeway and the roads were wet from previous rain and I almost died and hydroplaned on the freeway. Even if it's a small bit of rain my car starts shaking as if I don't have control. I do not feel safe in this car and I just got the car a month ago.

- Houston, TX, USA

The contact owns a 2015 Mercedes-Benz C300. The contact stated that while attempting to accelerate from a stop light, a loud sound came from the engine compartment and the vehicle began to vibrate and shake before stalling. The vehicle was towed to the local dealer keeler Mercedes Benz located at 1111 troy schenectady rd, latham, NY 12110 who diagnosed that the engine was faulty and needed to be replaced. The cause of the engine failure was not provided. The manufacturer was notified of the failure. The failure mileage was 48,000. ## VIN passed ## Mercedes-Benz 2015 C300 amg ##

- Latham, NY, USA

While driving on the highway my my Mercedes Benz C300 2015 with 37000 miles, engine broke, and you are not expecting that when you are driving at 65 mph. The mechanic is saying it is a wrist pin and a cracked #1 piston and it is a very common issue on that car and Mercedes refuses to recall or fix the problem im going to leave a link with one of the many webpages with al lot of people complaining about that problem. Thank you. Https://mbworld.org/forums/C-class-W205/731642-W205-C300-stay-away-piston-cracked-65-K-miles.html

- San Diego, CA, USA

Piston cracked at 68,000 miles, causing engine damage that cannot be repaired.

- Trabuco Canyon, CA, USA

The contact owns a 2015 Mercedes-Benz C300. The contact stated that the engine had been shutting off ever since the vehicle was purchased in 2016. In addition, several unknown warning indicators would illuminate for no reason. Mercedes-Benz of georgetown (7401 S interstate 35, georgetown, tx 78626, (512) 930-6150) stated that the engine was defective. The dealer stated that they previously repaired the engine under warranty and would not do it again. Mercedes-Benz of austin (6757 airport blvd, austin, tx 78752, (512) 220-0940) called the other dealer and informed them not to repair the vehicle. The vehicle was not repaired. The failure mileage was 20.

- Manor, TX, USA

Bought used Mercedes C300 2015 4matic on Feb'2019, odometer reading was 44K miles with clean carfax report. After driving just about 7K mikes more, at 53K mikes car shows engine warning. This is unfortunate from mercedez that with this much of nirmal use, car is having engine issues.

- San Jose, CA, USA

While the vehicle in motion, hearing a loud sounds coming from the engine. At first it's sounded like a rock in a tin can, later it was a slapping sound. About 10 minutes later finally got off the highway and turned in to my neighbor hood. At the last right turn, the car seized up. Tried to restart nothing happened. Good thing it was around 11pm there was no traffic or as many cars on the road. If it were it could probably just stop on the middle of the highway. The car is at the dealership and saying it needs a new engine, costing about 13K. Which is absolutely ridiculous, there was no signs of engine problem, engine light wasn't on. Out of no where, engine locked up and I had to push it home.

- Gilbert, AZ, USA