2018 Mercedes-Benz C 300 engine problems

Related recalls

No recalls on file.

What owners say

1. Filed Jan 9, 2026CAEngine

   Check engine light comes on, Error Code P052E, after a lot of research, this is a known defective part by Benz. Huge safety issue not addressed by them. Very costly to fix for a customer. There is a new and improved replacement part from Benz indicating they are aware of the faulty old parts that are currently in those cars but yet they have failed to do a recall.

   NHTSA complaint #11709871 · source
2. Filed Oct 23, 2025AZEngine

   My vehicle only had 31,000 miles and I experienced engine failure. I bought a new engine for 16, 500. 00 dollars. Mercedes Benz did nothing. I almost got in to several accidents because the engine completely stop on the interstate. Almost got hit by several cars. This is unacceptable.

   NHTSA complaint #11695170 · source
3. Filed Feb 3, 2025NYEngineFuel, Hybrid & EV Propulsion

   The engine light is on with only 35000 miles. Upon using an OBD2 scanner, error code P052e positive crankcase ventilation(PCV) malfunction was detected. It's a problem that I researched and noticed a lot of people having the same issue. I was told that this can cause the car to stall or shut down? This causes serious risk and safety issues to drivers, passengers, and pedestrians. With so many complains about this problem, I believe the manufacturer and dealers should take…

   NHTSA complaint #11640265 · source
4. Filed Jul 27, 2024NJEngineOther / Unknown

   The day after I purchased my c300, the engine light popped on. I went back to dealer and they said it was a recall because of a crank case (PCV). I was upset because they never said anything about it. This was April of 2024. Note:(This Dealer was not Ray Catina’s of Edison). I went to Ray Catina’s in Edison for them to inspect car and I have been calling because I was told it was a national recall and it was on back order and should be here in June. It is now almost August…

   NHTSA complaint #11604857 · source
5. Filed May 27, 2024CAEngine

   Car needs an engine rebuild at 90K miles due to a cracked piston #1, a problem with a car that received regular oil change intervals and proper service should not have

   NHTSA complaint #11590907 · source
6. Filed Mar 25, 2024NJEngine

   Code's p052w-71 & p060a-00 these's codes has been an issue with mercedes benz for quite some time now... Its been complaints after complaints and mercedes benz has not taking ownership of the issue.. This is definately a recall please look into this i can be reach at [xxx] information redacted pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6)

   NHTSA complaint #11579237 · source
7. Filed Feb 20, 2024NYEngine

   I have 33,000 miles on the vehicle and the check engine light came on. The code P052e came up Positive Crankcase Ventilation Regulator Valve Performance. I’m reading that many people have the same issue but there is no recall. Is there anything that can be done?

   NHTSA complaint #11573044 · source
8. Filed Oct 20, 2023MDEngine

   My car was diagnosed with positive crankcase ventilation regulator valve performance failure. This should be recalled by the manufacturer because many c300 are having this very same issue.

   NHTSA complaint #11551029 · source
9. Filed Oct 17, 2023NYEngine

   Check engine light appeared.I took it to Mercedes and they said the crankshaft was faulty. I had to repair it and it cost me about $1800.00.

   NHTSA complaint #11550481 · source
10. Filed Oct 5, 2023INEngine

    Engine code: P052e - the widest spread engine issue on Mercedes which fails emissions testing. Crankcase ventilator issue which leads to stalling.

    NHTSA complaint #11548498 · source
11. Filed Sep 26, 2023MIEngine

    Positive crank case valve failure. Check engine light on. Mechanic started this was extremely common and a costly repair on lower mileage Mercedes Benz vehicles. Mercedes Benz forums also mention this is extremely common and frustrating. This happened at slightly over 50k miles on my vehicle. Error code P052e

    NHTSA complaint #11546676 · source
12. Filed Aug 5, 2023VAEngine

    The check engine light has been coming on to indicate replacement of vent valve assembly According to the Mercedes Benz dealership. This is a commonly known problem in MB that they should replace and repair instead of charging customers $2k. My car has below 40k miles on it.

    NHTSA complaint #11536699 · source

Source: U.S. National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation public data. Complaints are submitted by owners and are not verified by NHTSA or by us; a complaint does not prove a defect exists. View this vehicle on NHTSA.gov Methodology