Code P052E

- Hollister, CA, USA

Crankcase ventilation valve malfunctioning Second time with car. Creating trapped exhaust in crankcase.

- Miami, FL, USA

Mercedes crankcase ventilation valve has failed, error P052E71. Found that this is happening to thousands of other Mercedes c300, and even after it is fixed it happens again. Reporting this so hopefully it can be resolved with a recall.

- New Hartford, CT, USA

Vehicle throwing P052E error (crankcase ventilation valve - PCV) - Has occurred multiple times and has effected numerous C300 models of the years 2015-18. - The car has lower acceleration performance and can be potentially dangerous when merging on highways.

- West Lafayette, IN, USA

PCV valve

- Portland, OR, USA

check engine light p052e71 the valve for the crankcase ventilation has malfunctioned, and the actuator is blocked. Replaced the crankcase vent valve assembly 59k mileage when this issue occurred.

- Union City, GA, USA

Check engine light came on and gave code P052E PCV Regulator Valve Performance

- Trumbull, CT, USA

Cracked cylinder #1. Causes rough idle, loss of power and lots of white smoke out the tail pipe. This is dangerous for anyone behind the car trying to see through the smoke then loosing power and other vehicles almost hitting me. Mercedes know they are defective but because of the large cost associated with repairing them they will not fix.

- Covina, CA, USA

Cylinder #1 losing compression. Onset acute after exiting freeway. Car lost power. Engine warning light turned on. Independent repair shop advised compression problem in Cylinder #1. Dealer then inspected and advised there was compression loss in Cylinder #1. Dealer recommended engine replacement (not repair). The car only has around 46,000 miles and is a 2015 model.

- Walnut, CA, USA

The crankcase ventilation valve has gone out on my car. This is a continual problem with these vehicles at low mileage. Mercedes Benz should recall the part for repair as they stated it could damage the engine.

- Weatherford , TX, USA

PCV (Positive Crank Ventilation) error fault. Error message keeps coming and is affecting a large number of vehicles.

- West Lafayette, IN, USA

MY VEHICLE'S Positive Crankcase ventilation valve NEEDS REPLACING. AFTER RESEARCHING THIS ISSUE FOR A WEEK IM LEARNING THAT THIS IS A VERY COMMON ISSUE WITH MY VEHICLE'S MAKE MODEL AND YEAR AND IS LIKELY TO OCCUR MORE THAN ONE TIME IN THE VEHILES LIFETIME. THE PROBLEM HAS BEEN CONFIRMED BY AN INDEPENDENT SERVICE CENTER I WAS MADE AWARE OF THE ISSUE BY MY VEHICLE'S CHECK ENGIN LIGHT

- Ruther Glen , VA, USA

I keep getting a litany of warnings on the dash.

- Rockville, MD, USA

I got a P052E code on my car which means a faulty crankcase or PCV valve. After doing some reading it seems to be a super common problem.

- Fort Worth , TX, USA

This vehicle has a known issue of the timing chain needing replacement around 80,000 miles. When I hit approx. 78,000 miles i started hearing strange sounds and issues with my vehicle starting so I took my vehicle to a local mechanic and he said that the timing chain needs to be replaced. he also stated that there should be a recall on this issue as there has been a recall on the same vehicle for the same issue just a different year which has the same exact engine therefore this year of vehicle should also have the recall applied for the timing chain to be repaired. This issue is causing engine problems and will eventually lead to the engine completely blowing at any time now.

- Napa, CA, USA

Long story short, I own a 2015 C300 Mercedes with 59,500 miles I was driving on the street when my engine started shaking so rough and my car lost power. I panicked and pulled over and drove 10mph all the way home. My vehicle would shake rough, couldn-??t exceed 10mph and would make loud noises. I take it to the Keyes Mercedes dealership and they tell me it-??s a cracked piston. I couldn-??t believe it because I only have 59k miles. I have my vehicle records so I have been up to date on my maintenance. They dissembled my engine and couldn-??t find the cause to the failure but found the cracked piston in cylinder #1 and damage to the cylinder walls. They recommended to replace complete engine and it will cost me about more than $18,000!! The piston falls under Mercedes 7 year/70k miles emissions warranty and yet they deny coverage. After doing lots of research I come to find out that I-??m not the only victim that has suffered the exact damage. People that also own a Mercedes c300 and other models are now without a vehicle and looking at a repair of $18k+ and making a car payment for nothing. This has caused us stress, inconvenience, and damage to our mental health. Keyes Mercedes located in Van Nuys is also aware of the common cracked piston issues on their vehicles. In 2 days I mark 4 months without my car. Please help!!

- Van Nuys, CA, USA

Car has 51,000 miles, no check engine light or any other warning light.driving in on the freeway at 70 mph when I hear a pop sound and my car loses power, I pushed on the gas and it started to shake violently and I panicked as the construction on the freeway was not allowing drivers a shoulder to pull over on. I was lucky enough to be driving at 2am and with the construction going on, drivers were already slowing down. My car also started blowing a thick white smoke through the back exhaust that could have made it harder to see that late night as it was already foggy here in California. At first I didn-??t realize I was smoking through the back until my car began smelling like burnt oil. I wasn-??t able to get off the freeway until the next exit all while thinking that my car was going to explode from the smell of the burning oil. When I pulled over and got out of the car I made sure I didn-??t see any fire and then I waited to let it cool down, opened the hood and saw oil everywhere. I had it towed to Mercedes and I got the problem and the estimated cost to repair it. The problem turned out being a cracked piston in cylinder one, when it cracked it allowed oil to mix with the gasoline and that-??s what was causing all the white smoke out the rear, the burnt smell was from the oil that was leaked all over my engine getting too hot from the engine. I found out a few days ago that Mercedes-?? has a technical billeting regarding a faulty wrist pin that was causing the pistons to eventually crack. In the bulletin the faulty pin problem is fixed by replacing all the pistons and adding a upgraded pin and many other parts. So there are many other drivers that are experiencing this and driving with faulty wrist pins. Prior to all this happening the car always made a tap tap tap sound from engine and Mercedes-?? said it was normal for 4cylinder turbos to make this sound, sounded like a diesel. But it turned out being from the loose wrist pin. Mercedes lied to us. THE CONSUMER REQUESTED THAT MERCEDES BENZ VEHICLE

- Chino, CA, USA

The wrist pin is defective in early engines during manufacturing. It is not safe to operate the vehicle because at any time without any warning this can cause fatal damage to the engine - piston crack resulting in total loss of control even at high speeds on the highway. Numerous complaints were filed on NHTSA regarding cracked pistons most likely related to this wrist pin manufacture defect. The problem is acknowledged by M-BENZ (NHTSA ID Number: 10058545), and starting around April 20 2015 M-BENZ started to install modified wrist pins to prevent future failures, but they did not address existing faulty wrist pins. The vehicle was always serviced at the official MBENZ Dealer service and was under comprehensive inspection multiple times but the issue was never acknowledged by the service technicians during the warranty period even though the issue existed since manufacturing and instruction of how to diagnose was distributed between service technicians via Manufacturer Communication Number: LI03-10P060916 in 2015. When the M-BENZ Delear service technician finally confirmed the issue, the vehicle was already out of warranty and there is a hefty price to a customer to fix this manufacturer defect that should not have been there in the first place. There are no warning lamps, messages, or other easily detectable symptoms of the problem prior to the failure. The issue can be diagnosed under very special conditions described in Manufacturer Communication Number: LI03-10P060916 For most drivers, it's hard to diagnose that something is wrong and easily mistaken for normal operation noise of the engine

- Fort Lauderdale, FL, USA

The contact owned a 2015 Mercedes-Benz C300. The contact stated that while idle, the engine would vibrate with an abnormal sputtering sound coming from the engine. As the failure persisted, the check engine warning light illuminated. The contact had initially taken the vehicle to a dealer and the spark plugs were replaced; however, the failure persisted. The vehicle was returned to the dealer and a diagnostic test was performed, and it was discovered that an engine cylinder had blown. The vehicle was diagnosed with engine failure and the contact was provided an estimate for the repair. The contact then spoke to an independent mechanic who informed her that the failure was a common failure for her model vehicle. The manufacturer was also notified of the failure and a case was filed. An email was sent to the manufacturer and the contact was informed that no further assistance could be offered. The vehicle was not repaired. The failure mileage was approximately 50,900.

- Scottsdale, AZ, USA

Without any warring or indication my engine would start making bad noise then light comes on to check engine as the motor fails and car shuts off. This is while driving and has happened two times now. Both times I find it-??s due to spark plug failure and pieces of the plug go throughout the engine and severely damage. First time this happened at 82,000 miles and was covered by warranty. Now this has happened again on the new engine with 81000 miles on it. I seen many forums on this issue. This time it-??s not under warranty and it-??s $18000 to fix. Mercedes Benz w205 engine seems to be notorious for spark plug failure in cylinder 1 as well as piston cracking. The first time this happened was October 12th 2019 and the warranty work was done at fletcher Jones Mercedes Benz of Newport Beach

- Anaheim Hills, CA, USA