2018 Mercedes-Benz C-Class
Problems, recalls and owner-reported issues
Engine is the leading concern among 130 owner complaints filed for this model year. This is the 15th highest complaint count among 23 C-Class model years with reports.
Of the 2018 reports, 5 involved a crash. 2 people were injured.
What owners report most often
Recalls and investigations
No safety recalls on file.
Representative owner complaints
130 reports, newest first.
Structure, Oct 25, 2023
The contact owns a 2018 Mercedes-Benz C300. The contact stated while attempting to close the sunroof, the sunroof failed to close properly. No warning lights were illuminated. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 21V197000 (Structure) but the VIN was not included. The manufacturer was notified of the failure, and a case was opened. The failure mileage was 45,000.
Engine, Oct 20, 2023
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.
Engine, Oct 17, 2023
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.
Engine, Oct 5, 2023
Engine code: P052e - the widest spread engine issue on Mercedes which fails emissions testing. Crankcase ventilator issue which leads to stalling.
Engine, Sep 26, 2023
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
Engine, Sep 15, 2023
Engine light came on, checked with diagnostic machine shows a crank shaft issue. I have maintained the car with regular checks and maintenance. This has to be a defective part.
Electrical system, Other or unspecified, Sep 6, 2023
According to the dealership, if the car is not started every 3 days, it will shut itself down. The car was towed 6 times, I'm a business woman, my coworkers, friends drives Mercedes Benz, and no one have heard of any such issues. Any cheaper cars, after 2 weeks at the airport, the car starts. Something is wrong with the car, something is draining the car battery if not started every 3/ 4 days. They are taking advantage to the fact, that I'm a female and older. They need to replace the car, fix, or junk their car. Someone needs to take responsibility for the repair of the car.
Other or unspecified, Sep 5, 2023
The check engine light came on with the error code P052E - PCV valve failure while the car is only driven for less than 38K miles. I am worried about the quality of the car/engine.
Electrical system, Aug 24, 2023
Hello My c300 2018 only have 79k and suddenly the engine light on, when I check it show that I need Positive Crankcase ventilation valve replace. it cost $2300. As I know a lot of people who own Merced have the same problem so should have a recall for that Thanks
Visibility/wiper, Structure, Aug 12, 2023
Incorrect bonding of the rear window. The rear window bond is failing which is causing the window to detach from the convertible top. The bonding is failing in many different locations, causing not only detachment, but the failure is also causing fine hairline cracks at the points of failure. The dealership refused to correct the defect, informed I would have to pay $3,000.00 to correct the failure of the bonding.
Engine, Aug 5, 2023
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.
Engine, Fuel/propulsion system, Jul 26, 2023
Check engine light came on. Had a diagnostic check and was told that the crankcase ventilation sensor needs to be replaced which will cost $1200.
Other or unspecified, Engine, Fuel/propulsion system, Jul 23, 2023
My c300 2018 only has 50k and suddenly the engine light is on, when I check it shows that I need the Positive Crankcase ventilation valve replaced. it cost $2300. As I know a lot of people who own Mercedes have the same problem. Three mechanics claim it on almost all C, CLA, and GLA models. Please make Mercedes recall it finally.
Engine, Jun 7, 2023
Has 27000 miles out of warranty at 5 years. PCV code bad actuator. Looks like a common problem. Should be recalled.
Fuel/propulsion system, May 25, 2023
This particular model of vehicle has a well-known and documented failure of the PCV valve (Crankcase). This has not been identified by NHTSA to date. This should be considered for a recall due to the high incident rate of the P052E error code (valve failure) as this causes reduced emission control and possible explosions within the engine due to pressure-related issues. My vehicle did not have any warnings prior to the engine light illuminating. After diagnostics, P052E was identified. Dealership told me that it needed to be replaced as it would fail and result in damage.
Engine, Fuel/propulsion system, Apr 30, 2023
The code I received is p052e from the check engine light. This can cause the car to stall out mid way through driving and cause a potential fatal accident. This is a common issue across C300 And GLC benz.
Other or unspecified, Apr 16, 2023
Rear camera doesn’t work
Other or unspecified, Apr 2, 2023
The fault code P052E71 is logged in the fault memory of the engine control unit. Cause: Possible cause: The component or the electrical actuation at the partial load crankcase ventilation valve (Y58/2) may be faulty or might not activate initially.
Electrical system, Communication, Mar 10, 2023
The contact owns a 2018 Mercedes-Benz C300. The contact stated that after starting the vehicle, the S.O.S. Not Active message displayed. The contact was concerned that in the event of an emergency, the emergency services function would be inoperable. The vehicle had previously been serviced under NHTSA Campaign Number: 21V058000 (Electrical System, Communication) however, the failure recurred. The dealer was made aware of the failure; however, the vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 85,000.
Engine, Feb 22, 2023
Engine light P052E, This seems to be a common problem with the C300.My concern is that Mercedes Benz hasn’t address the common issue. I own the car less than a year got it from Mercedes dealership and to be honest I expect Mercedes Benz to be better than the this to it customers
Engine, Fuel/propulsion system, Feb 21, 2023
Failed positive crankcase ventilator after 40,000 miles common problem regulating oil consumption to the engine. Causing oil burn, oil leak, inconsistent oil ventilation. Dealer is aware of the problem. Engine light is on with code P052E. Commonly reported problem for this model on the internet.
Engine, Fuel/propulsion system, Feb 21, 2023
at 67000 miles the check engine light came on and is was engine code p052e crankcase ventilation regulator valve failure. This failure will cause the ending to exhaust increased contaniments in to the air. This is a know problem by MBUSA and they have changed the part design on new vehicles , this problems comes up right after the cars warranty and they cost to repair is in excess of $2500. For this to be an emission know problem by MBUSA a recall should be issued and this problem corrected under the recall process of the NHTSA ASAP. This has been reported to MBUSA and they have been zero help in this matter. The NHTSA is here to protect our citizens and environment and hopefully you will continue to do so.
Engine, Feb 17, 2023
Code P052E just like all 2.0 turbo Mercedes Benz engines will get. This is a engineering defect and the cars with these engines should be recalled. I have researched and read that even after repaired this expensive engine defect will re-occur about every 35000 miles.
Structure, Other or unspecified, Jan 29, 2023
This is 2018 Mercedes Benz - C300 and it seems across this model line up and models from that year it looks like headliner particularly fabric starts to separate from the pillars in the rear. Across google there is bunch of C300 with the same issue in the same spot starting. The Car is only 5 years old and if it would be any other brand I would not be to upset about it. But this is Mercedes and they pride themselves of being a " Luxury " Vehicle where their standards should be much higher. Needles to say we contacted and went to one of the Mercedes Dealership that we got charged $226 for the inspection and Mercedes did not honored to replace the defect nor MBUSA - did not helped either. This is the problem across the model . Be AWARE and take this into consideration when thinking of purchasing this particular model year C300.
Engine, Jan 24, 2023
2018 Mercedes C300. P052E check engine code. Positive Crankcase Ventilation failed with less than 28K miles. Common reported problem but not covered after warranty period, even with extended warranty addition. It's a major part of the engine function and 6 hours of labor to replace. Mercedes Benz should cover this type of fault on the design.