ode P052E : Positive Crankcase Ventilation Regulator Valve Performance. This seems to be a common problem with the C300.It's not an easy fix. MB hasn't addressed this common issue. Also strong smell of gas coming into the cabin during start up. Took car to Keys Van Nuys Mercedes in North Hollywood and was no recall. We are inhaling these fumes and they blamed it on a hose that expands and fumes escape into the cabin. Wanted to charge for the repair but I refused.

- Burbank, CA, USA

The contact owns a 2017 Mercedes-Benz C300. The contact stated while driving 45-50 MPH, the vehicle stalled inadvertently and would not exceed 3 MPH. There was no warning light illuminated. The contact was unable to veer to the side of the roadway. The contact turned on the hazard lights. The contact turned off and restarted the vehicle however, the vehicle would not exceed 5 MPH and was making abnormal sounds. The contact veered to the side of the road for approximately 4 hours until there was no longer traffic on the roadway. The contact proceeded to drive at 5 MPH to her residence less than two miles away. The manufacturer was notified of the failure and assisted with towing the vehicle to the dealer to be diagnosed. The contact was informed that the piston rings had blown out and the engine needed to be replaced. The manufacturer informed the contact that the failure was a known failure; however, she would be responsible of the cost of the repair. The vehicle was not repaired. The failure mileage was approximately 29,650.

- Las Vegas, NV, USA

My car threw the check engine code P052E, the issue is the positive crankcase ventilation valve being faulty. Incredibly common on this model and now failed on my car too at 60K miles. All maintenance was done up to this point with the dealer and at or before recommended intervals.

- Columbus, MS, USA

My car leaked oil very fast while me & my wife were on a trip and it stopped on the highway and engine was stalling and misfiring due to a manufacture defect that is common with this model so it did put us in a very dangerous & risky situation. Now after i paid $1,740 the dealer is saying that my car needs a new engine due to cracked piston in cylinder 1 that damaged the engine which is a common problem with this model around the 50k miles.

- San Francisco, CA, USA

Diagnosis code P052E PCV regulator valve replacement/crankcase replacement. Dealership does not want to acknowledge code while car was under warranty despite proof that it existed when check engine was diagnosed. Now code keeps coming back with check engine light on dashboard. To replace part, the engine has to be taken down since the crankcase is inside the engine. This is a malfunction during assembly/manufacturing, it is impossible to damage part while under usage. Mercedes Benz should be held responsible for part replacement and labor. I urge you to investigate this matter with other clients and ask the manufacturer to replace part and pay for labor.

- Champaign, IL, USA

Check engine light came on, took it to the dealership. It is the Crankcase Ventilation Valve that is once again broken. It helps to accurately depict emissions. It is a known problem that hundreds of other drivers are reporting on forums https://www.benzworld.org/threads/2015-c300-crankcase-ventilation-valve-replacement-p052e71.3047538/page-1 https://mbworld.org/forums/c-class-w205/739851-check-engine-code-p052e.html There needs to be a recall, this is a consumer protection and environmental safety issue.

- Durham, NC, USA

misfire cylinder 1 46300 miles on the engine.Mercedes dealer told me I need new engine and they are not providing warranty coverage.

- Desert Hot Springs, CA, USA

P06DA00 CODE oil pump vale circuit open

- Granger, IA, USA

CODE PO052E71 crankcase vent solenoid causing check engine light

- Granger, IA, USA

At approximately 26,500 miles of use, the check engine light came on in my Mercedes Benz C300. I brought the vehicle to the dealership and they informed me that the diagnosis was a crankcase vent valve malfunction. The MB fault code is P52E71. After paying Mercedes to fix the issue, I found forums on the internet where many other MB owners reported the same issue at around the same mileage. Being that this seems to be a common malfunction with the C300, I believe that it should be considered as a recall issue. I don't know what could have happened if I didn't service the vehicle, but any engine issue is dangerous while a vehicle is in motion.

- Bedford, NY, USA

When starting the car in the morning there is fuel smell that gets into the cabin. Additionally, as the car is idle during the drive, the smell of fuel is very obvious. Windows have to be rolled down to avoid the smell

- Seattle, WA, USA

Vehicle won-??t start or hard to start

- Summerville, SC, USA

When the car is in the a feature, where it turns on and off when not in motion, it gets stuck in that mode as if a magnet is holding it in that position. It will not move, it stalls. I turn it off and turn it back on and sometimes it still will not move, sometimes, it will not turn back on. This has happened on several different occasions. Once, I pulled to the side of my mailbox to pick up mail, and another occasion I pulled into my garage, and it stopped, and would not turn on. This is very dangerous, I would hate to be in traffic, railway crossing, ir stop sign and this occurred. Peoples lives have been lost due to this issue. One lady was hit by a train when this same situation occurred and lost her life. I am very concerned for my safety and of my grandkids whom I Transport in this car. It also seems that something is wrong with the gears. Sometimes, I put it in reverse and it sits there. I put it in drive and it will not move. I feel very unsafe in this vehicle. Please help.

- Conyers, GA, USA

Car started to vibrate at idle then graduated to shaking at all times even during acceleration. Acceleration very slow, stuck feeling. Brought to Mercedes at 28K miles. They stated it is a cracked piston in cylinder 1. this is apparently a very common issue with this engine but there are no recalls yet.

- Las Vegas, NV, USA

2017 Mercedes C300 coupe 49,000 miles. This car has been to the service center 10 times for engine problems " vibratiing, jerking, shaking and ticking" last visit at hoehn Mercedes, . service tech said that these engines automatically vibrate and jerk and that is just the nature of the beast"? wtheck??"!! have already had piston 1 crack and break, mechanic never found the broken piece. Car is much worse since that repair. Hoehnn mb told me that they were replacing the engibe but whwn I picked up the van they said they decided just to replace piston #1

- El Cajon, CA, USA

Piston 1 cracked at 48,000 miles. Mb told owner that the engine had to be replaced but when finding out that the warranty was up at 50,000 they replaced the piston instead. Car is still shaking at idle and rough ride. Engine shakes and jerks.

- El Cajon, CA, USA

The contact owns a 2017 Mercedes-Benz C300. The contact stated that the vehicle was equipped with the push to start feature. When the vehicle was started, it vibrated abnormally. The contact stated that the vehicle was taken to hendrick motors of charlotte-Mercedes Benz (5201 E independence blvd, charlotte, nc 28212, (704) 909-6941). The contact was informed that the vehicle performed as intended. The vehicle was included in NHTSA campaign number: 17V114000 (electrical system, engine and engine cooling). The vehicle was not repaired. The manufacturer was not contacted. The approximate failure mileage was 40.

- Charlotte, NC, USA

The contact owns a 2017 Mercedes-Benz C300. The contact received notification of NHTSA campaign number: 17V114000 (electrical system, engine and engine cooling). The part to do the repair was unavailable. The contact stated that the manufacturer exceeded a reasonable amount of time for the recall repair. The contact spoke with keyes european (5400 van nuys blvd, van nuys, ca 91401) who stated that they had no information and that the contact should call the manufacturer. The manufacturer was made aware of the issue and stated that the vehicle was safe to drive. There was no time estimate regarding part availability. The contact had not experienced a failure. VIN tool confirms parts not available.

- Sherman Oaks, CA, USA

The contact owns a 2017 Mercedes-Benz C300A. The contact received notification of NHTSA campaign number: 174V114000 (electrical system, engine, and engine cooling); however, the parts to do the repair were unavailable. The contact stated that the manufacturer exceeded a reasonable amount of time for the recall repair. The contact called Mercedes-Benz of san antonio (9600 san pedro ave, san antonio, tx 78216 (210) 920-3235) and was informed that parts were not available. The manufacturer was not made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

- Converse, TX, USA

The contact owns a 2017 Mercedes-Benz C300. The contact received notification of NHTSA campaign number: 17V114000 (electrical system, engine and engine cooling); however, the part to do the repair was unavailable. The contact stated that the manufacturer exceeded a reasonable amount of time for the recall repair. The dealer was not contacted. The manufacturer was made aware of the issue and was not able to confirm when the parts were to become available. The contact had not experienced a failure. VIN tool confirms parts not available.

- Stockton, CA, USA