So many Mercedes Benz owner have issues with the code p052e code postive crankcase ventilation regulator valve This should be a recall

- El Cajom, CA, USA

The vehicle is not passing emission inspection because the Positive Crank Case Valve/Ventilation failed to work after 48K miles.

- Parsippany , NJ, USA

P052e positive crankcase ventilation valve. Check engine light triggered by this code.

- Macon, GA, USA

I opened my panoramic sunroof it didn-??t open all the way and slammed shut. It didn-??t break but if it had there would have been injuries. This is a known problem with this years car. And it needs to corrected.

- Holland , OH, USA

While driving on the highway, I tried to open my panoramic sunroof, it made a grinding sound and was stuck in the open position with one corner for the sunroof slanted higher than the other. I was afraid that the sunroof would shatter or that the wind would blow off components. Afterward, the sunroof would not close even after I took it to the dealership. They informed me that they could not close the sunroof and my only option was to repair it for $4,000 or buy another car. After looking at the costs of replacement cars, I decided to pay for the repairs out of pocket. I found on multiple reddit and mercedes forums that this is a common issue in Mercedes C class vehicles made on and around 2016. My service advisor told me that he has so many customers from these panoramic sunroofs failing due to a cost cutting measure from Mercedes who decided to use plastic tracks instead of metal. He also informed me that they went back to metal a few years after my car was manufactured. This leads me to believe that Mercedes acknowledged the issue and is trying to hide it from NHTSA. Here is a link to a forum post that has a similar picture to how mine looked, notice that one side is stuck in a higher position. [XXX] Here is another post with others with similar issues [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Charlotte, NC, USA

I was taking my son to work and I heard my sunroof open and close when the controls were not being touched. I-??m afraid if it opens and it closes on its own that it could fly off my car and hit someone else-??s car and possibly injure some one.

- Holland , OH, USA

PCV Valve Malfunction, common in my model year.

- Brooklyn, NY, USA

PCV valve

- Green Bay , WI, USA

Positive Crankcase ventilation regularly Valve. This issue is in so many c300s and should be recalled for that reason.

- Rancho Cucamonga, CA, USA

Crankcase Ventilation Valve Emission Modification -Error P052E71 -Error P06DA00

- Hayward , CA, USA

Ac/heater smells like mold/musty/mildew inside the cabin. Took for the extended warranty but will not honor unless you have proof of cabin filters purchased every year. This is their way of finding a loop of not fixing the issue.

- Troy, MO, USA

My panoramic sunroof has an extreme amount wind coming through it while driving 40 miles per hour. I can also hear my panoramic sunroof sliding back and forth. I-??m terrified that that it will fly off while driving and cause a road hazard.

- Holland , OH, USA

Engine light with code P052E

- Lumberton , NJ, USA

In the past few months while driving this car in the Washington DC metro area at normal road speed, the car has suddenly and unexpectedly lost driver power. Each time, I have pushed down on the gas pedal, and after some hesitation the car has moved forward, and then continued to operate normally. This has happened three times in the past 3-4 months.

- Oakton, VA, USA

Had to have crankcase ventilation system replacement at 74k miles. $2,032.98 to replace. Did get a check engine light.

- Greeley, CO, USA

My check engine light popped on with code p052E for the Positive Crankcase Ventilation Regulator Valve Performance.

- Chicago, IL, USA

Check engine light comes up. The crankcase ventilation has to be replaced. This is a well known defect in design by Mercedes Benz and there are hundreds of people who have had to replaced the crank case costing thousands of dollar to only have it happen again due to its faulty design. It-??s well documented all over the Internet.

- Queens, NY, USA

My sunroof shade is stuck open which makes my extremely hot. I-??ve been burned twice by my seat. My car has 93,000 miles.

- Holland , OH, USA

The code P052E reads at only 49.000 miles....Mercedes wants $3000 to repait ir (replace PCV valve ). Car runs and drives normally....its probably a faulty sensor. I have seen a lot of posts with owners havins same issue.

- Champlain, NY, USA

The small plastic located inside the sliding panoramic sunroof explode and the Panasonic sunroof can be open/close or up/down normally but when I hit close it will stop where the broken pieces was and the roof will automatically move back to the fully open position Dealer said need the rail replaced -2057800175 -2057800275 Motor is broken, need to be replaced, he said after saying the roof can go forward and backward, up and down but can-??t close completely. I was gullible to believe what the technician and sale guy said. Technically technician can check the voltage and say it for sure if it is broken. Also, a technician already knew that the sliding rail is damaged. He jumped to the conclusion that motor is broken because of sunburn. I have asked my nephew what he would do in this situation. He innocently said he would replace new sliding rails first and try to run if the -??alleged motor -?? is really broken. If it is broken, he can just switch to a new motor before testing to confirm it working. He wouldn-??t decide to buy a new motor that cost $1,400 extra while the old one might be working properly. Anyway, labor with rails and -??motor-?? cost $3500. Then later I learn I-??m not alone. How many affected from this defective parts that Mercedes doesn-??t sell it separately. Owner must buy 2 set of rails- a left set and a right set. Cost $1100 total. So since the number of affected are pretty high, a few factory in China and turkey decides to produce these little and sell it online for $15-92, glue and lubricants included. -number of owners struggling to find parts https://mbworld.org/forums/c-class-w205/734208-pano-roof-failure-2.html Parts that Mercedes cannot sell it separately so owners have to buy 2 sets left set and right set rails. -??Try words like repair sunroof kit for Mercedes -?? on eBay only a few couple thousand people buying it in 2022 alone. https://www.ebay.com/p/28019877104 Motor broken? https://c.xtime.com/tvyUiiMwuwoA2L8JXX#/completePage

- Sherman Oaks, CA, USA