2015 Mercedes-Benz C 300 Engine Problems

The contact owns a 2015 Mercedes-Benz C300. The contact stated while driving 40 MPH, the vehicle unexpectedly veered to the left. There was no warning light illuminated. The contact stated that the steering wheel became inoperable, and the contact was unable to straighten the steering wheel. The brake pedal was also depressed. The contact attempted to depress the accelerator pedal however, the vehicle started to stall. The contact pulled over into a parking lot and was able to restart the vehicle. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 82,000.

NHTSA ID

11678756

Incident

Aug 6, 2025

Mileage

82,000 mi

Check Engine light came on recently, fault code P052E is identified by scanner. Car has 60,000 miles on original it. MB dealer wants to charge $300 for diagnostics, repair job (parts and labor) may cost over $2,000. Since this is critical emission compliance part/system, why is it not recalling?

NHTSA ID

11669468

Incident

Jun 16, 2025

The contact owns a 2015 Mercedes-Benz C300. The contact stated that approximately every 6-8 months, the vehicle sputtered while driving at various speeds or while idling. The contact stated that a month after the first failure had occurred, the front end of the vehicle lowered as if the shocks or hydraulic system had failed. The failure had occurred 3 times within a year and a half. The contact stated that after the second failure, the entire vehicle lowered several inches, and at the third failure, only the front end of the vehicle was lowered. The dealer diagnosed the vehicle and determined that the hydraulic pump and the connections from the shocks to the hydraulic pump had failed. The failure reoccurred approximately 8 months later. The vehicle was returned to the dealer who diagnosed the same failure and completed the same repairs. The failure reoccurred approximately 8 months later, and the vehicle was returned to the dealer who was unable to determine the cause of the failure. The vehicle was not repaired. The dealer provided the contact with a loaner while attempting to have the contact trade the vehicle. The manufacturer was made aware of the failure. The failure mileage was approximately 110,000. The VIN was not available.

NHTSA ID

11646427

Incident

Mar 5, 2023

Mileage

110,000 mi

The engine lamp turned yellow. The car got inspected by a mechanic and showed code. P052E, which indicates the defect in the crankcase ventilation valve. I see that many cars of the same model in which were produced about the same year had the same defect. I called the manufacture customer service and they claim that my van was not included in the recall. My vehicle likely had the same problem as other people did in the past, but for some reason my vin was not included.

NHTSA ID

11642081

Incident

Jan 31, 2025

failed piston wrist pins from early production of mercedes w205 c300. The issue was diagnosed by mercedes of manhattan and could not provide me a fix. Stated that the issue is common with the vehicle and it does not warrant a recall for this issue. i believe its a safety issue and my vehicle only has 60K miles

NHTSA ID

11639535

Incident

Jan 27, 2025

P052e positive crankcase ventilation regularly valve. 2015 Mercedes Benz c300 turbo 4matic

NHTSA ID

11618571

Incident

Oct 7, 2024

Crankcase Ventilation Valve Problem code P052E71

NHTSA ID

11611296

Incident

Aug 27, 2024

Purchased vehicle in march 2024 it went thru emission inspection in 2022 after failing it passed second time . I go for inspection and it fails emission test again just passed two years later. After doing my research Positive Crankcase Ventilation System seems to be a very common problem. It also cost 2000 to fix. Appreciate you time thank you

NHTSA ID

11607201

Incident

Jul 28, 2024

Unknown

NHTSA ID

11589816

Incident

May 13, 2024

PCV VALVE FAILURE PO52E ERROR

NHTSA ID

11585344

Incident

Mar 5, 2024

Code P052E

NHTSA ID

11581305

Incident

Mar 15, 2024

Pcv valve malfunction causing the 0sensor to short. It’s also spitting oil into my CAT.. Mercedes has the part on back order and no one can seem to get it but everyone is having the same issue.

NHTSA ID

11581046

Incident

Mar 1, 2024

Check engine light on with PO52E error

NHTSA ID

11580772

Incident

Apr 2, 2024

Crank case vent valve assembly

NHTSA ID

11578242

Incident

Mar 14, 2024

My 2015 Mercedes Benz vehicle is rarely driven as I took public transportation to work and has ~55000 miles. However, the engine has started throwing error code P052E verified by an independent dealer - crankcase ventilation valve failure. It means the engine could shut off amid driving and I did research and it seems like a very common issue that Mercedes Benz car owner encounter and feels like a severe car defect.

NHTSA ID

11568638

Incident

Sep 1, 2023

I keep getting the P052E PCV replacement valve issue. I see online that this has impacted multiple Mercedes C class but no recalls have been issued for this.

NHTSA ID

11567915

Incident

Nov 15, 2023

Was driving on the highway , car was running for about 7-10 min from the start , and when took off from exit , car started to shake and when pulled off to the side of the road , the car won’t start anymore , dealership said that engine failed ,

NHTSA ID

11563918

Incident

Jan 1, 2024

My car is registering code P052E71. The diagnosis says the valve for crankcase ventilation has a malfunction. The actuator is blocked. This is a common problem for this car with research. Some people have had to replace this part multiple times for their Mercedes which is a part that shouldn't fail. Nothing has been done such as a recall on this vehicle. The part and labor to repair this issue costs $1000+ dollars. Something should be done to help consumers. I'm doing my part to report this hoping something will be done.

NHTSA ID

11559315

Incident

Dec 4, 2023

Emissions Failure P052E - Positive Crankcase Ventilation Regulator Valve Performance. Vehicle has been inspected. Warning lamp appeared for my engine recently. Cause by faulty plastic valves that requires a significant costly repair - around $3,000 USD

NHTSA ID

11558631

Incident

Dec 5, 2023

Check engine light- code read Valve For Crankcase Ventilation Has A Malfunction. After googling this, it appears that many Mercedes owners are having this issue and comes back again after repair. This should be recalled by Mercedes.

NHTSA ID

11553227

Incident

Nov 2, 2023

check engine light

NHTSA ID

11548843

Incident

Aug 10, 2023

My check engine light came on recently on my 2015 C300 4matic. Car has 66500 miles on it. The code P052E71 was diagnosed - The valve for the crankcase ventilation has a malfunction. The actuator was blocked. This problems seems to be occurring to a lot of similar cars from Mercedes and some of them have reported that this issue keeps coming back. The dealership and other auto body shops say it's going to cost around $1500-$2000, considering how it's a tedious job to do and involves multiple hours of labor. The dealer won't repair it as part of warranty. This definitely seems to be an engine issue with the car and has nothing to do with how we drive. Cars not older than a couple years are starting to see this issue. There needs to be a recall for this and have Mercedes does something about it. Why are the consumers having to spend money to have the same repairs done for a bad design, parts and engine being provided by Mercedes.

NHTSA ID

11548516

Incident

Sep 24, 2023

The valve for crankcase ventilation has a malfunction. The actuator is blocked. Seems like its a common problem for all mercedes C300 ~2015 models. The part should be recalled.

NHTSA ID

11547899

Incident

Oct 1, 2022

After getting gas my check engine came on steady. Stayed on until cleared. After getting gas a 2nd time check engine light came on again, stayed on, but went out. Then after getting gas a 3rd time, check engine light came on again. Checked by a local Mercedes shop, code showed intake line oil separator bad. Owned this car for 7 years, never had an issue like this. 50,516 miles currently. Quote for repair is high, over $1000 dollars. All episodes of check engine light have occurred in a 4 week time frame.

NHTSA ID

11545905

Incident

Aug 1, 2023

P052E PCV value problem Google search results show this is a very common problem, and despite being a component of the vehicle emissions system, Mercedes is refusing to repair under the emissions warranty.

NHTSA ID

11545073

Incident

Jul 8, 2020