My engine light keeps coming on and off on my 2017 C300 4matic coupe. I got the problem diagnosed in March 2023. Benz said I had a faulty solenoid valve and that I would need to replace the crank case ventilation assembly. That is $3000. My friend has a C300 sedan and they replaced his under the extended warranty that came out on August 2023 for the crankcase. I have the same exact issue but they said my VIN doesn-??t populate so they cannot do anything. This is the 2nd faulty crank case in my car, it was replaced by warranty in 2019. I don-??t drive that much I have 47K miles on the car. They refuse to cover the faulty part.

- Bolingbrook, IL, USA

po52e71 the valve for crankcase ventilation has malfunction

- East Eden, NY, USA

P052e positive crankcase ventilation regularly valve

- La Mesa, CA, USA

Check engine light on on 2017 Mercedes C300 4 Matic. Car has 52,000 miles on it. The code P052E71 was diagnosed by Mercedes mechanic as the valve for the crankcase ventilation. The actuator was blocked. Mechanic said part (crankcase ventilation hose) is not available and this problem happens to all 2015-2017 C 300 models usually around 50,000 miles. When air conditioning or heat is run it causes an odor of burning fuel or oil in the cabin. Mercedes said part is not in stock and they have no ETA on when it will be available. Vehicle is unable to pass vehicle emissions test.

- Chicago, IL, USA

The contact owns a 2017 Mercedes-Benz C300. The contact stated that while at a stop light the vehicle stalled. There were no warning lights illuminated. The vehicle was taken to the local dealer where it was diagnosed and determined that the battery cable needed to be replaced. The vehicle was repaired but the failure recurred. The vehicle was taken back to the local dealer where it was diagnosed that an update to the powertrain software was needed, and the transmission pump needed to be replaced. The vehicle was repaired but the failure persisted. The contact called the local dealer, and it was recommended that the transmission be replaced. The vehicle was not repaired. The manufacturer was contacted. The failure mileage was approximately 80,000.

- Lawrenceville, GA, USA

My Mercedes benz C300 2017 have the P052E positive crankcase ventilation regulatory valve, and Mercedes Benz they start sending this letter and when I go to the dealer they said my car not qualified, but the letter says other thing, my car have the check engine light on with the code PO52E. They don-??t want to do the repair because is a $2,500 repair and they making excuses to not do it.

- San Antonio , TX, USA

P052E Positive Crankcase Ventilation Regulator Valve Performance this is a common issue with Mercedes as lots of car are affected by this and this should be covered under emission but lots of dealership are declining saying it-??s not covered under emission warranty but this code cause pollution and this part is so expensive to fix and I paid 2k to fix it last year and that same code came again. We can-??t keep paying 2k plus for something Mercedes fault design Please help us and make Mercedes Recall this Part

- Cleveland, OH, USA

P052e..PVC ventilation crank shaft valve sensor, too many people all reporting the same expensive item/ labor intensive work by a dealership just after the warranty expires. Help. There are thousands of us with the EXACT SAME CODE AND PROBLEM!! ORDER A RECALL INVESTIGATION!! PLEAS"!"!!!

- Salem, OR, USA

The contact owns a 2017 Mercedes-Benz C300. The contact had received notification of NHTSA Campaign Number: 21V032000 (Seat Belts). The vehicle was taken to a local dealer and the recall repair was performed; however, upon retrieving the vehicle, the check engine warning light illuminated upon starting the vehicle. The vehicle was taken back to the dealer and remained in the dealer possession. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 34,000.

- Richmond, CA, USA

Check engine light came on. Error code indicates a PCV crankcase ventilation valve has malfunctioned. Code is P052E. This is a notorious problem with Mercedes, BMW and other European cars. It should also be considered part of the emissions system. Contacting the MB dealers, I cannot get a clear definition whether it is covered by extended warranties or any warranty whatsoever. They are vague as to "maybe, but not sure". I feel that there should be a recall to fix the defective parts involved with this error code.

- Homosassa, FL, USA

P502e code crankcase ventilation failure

- Franklin, WI, USA

P052E PCV Regulator Valve Performance

- Cleveland, OH, USA

My vehicle started shaking and the check engine light came on. It's a PCV valve

- Placentia, CA, USA

I took my vehicle to the mechanic due to the check engine light been on. The diagnostic came back to be that "The valve for crankcase ventilation has a malfunction. The actuator is blocked." As per mechanic this has to be replace but cost around $ 2,000 plus.

- Allen, TX, USA

P520E code which is caused by a crankcase ventilation issue. The fix costs upwards of $2000. It seems to be a common issue with Mercedes vehicles with 4 cylinder turbos and should be a recall on this system.

- Beaufort, SC, USA

Piston one issue. I bought this car from an auction and according to the record on the car the previous owner had problem with piston one and low compression in that piston. After performing some research it looks like Mercedes-?? Benz c300 m274 is riddles with this issue. It-??s all over the internet and I don-??t know why Mercedes is not taking responsibity for this. This car has less than 70000 miles and the engine is locked from the cylinder. Thank you

- Montgomery , AL, USA

The Crankcase Ventilator Actuator has malfunctioned, resulting in the Check Engine light showing up. The MB C300 4matic 2017 vehicle is at 40,200 miles as of [XXX]. Lot of other MB owners have reported same issues. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Loveland, OH, USA

My c300 2017 only had 55k and suddenly the engine light on, when I check it show that I need Positive Crankcase ventilation valve replace. it cost $2300.

- Wingdale, NY, USA

Piston crack in Cylinder 1

- Simi Valley , CA, USA

My Mercedes Benz stopped working. The mechanic shared it involves the: fault valve for crankcase ventilation has malfunction.

- Sacramento, CA, USA