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: other or unspecified
27 reports, newest first. Show all
Other or unspecified, Aug 28, 2026
Sunroof causing dangerous pinch conditions. Roof tracks break and cause pinch areas with partial opening of roof
Suspension, Structure, Other or unspecified, Jul 24, 2026
2018 Mercedes C300 - a hole rusted through the rear subframe causing structural safety concerns. This car has been routinely washed weekly and the frame should not have rusted through within only 8 years. This also led to a large repair bill.
Other or unspecified, Jun 16, 2026
Transmission failed, yes available for inspection Very bad safety issue Yes it has been confirmed by dealship Yes by the deanship Yes there was warning lamps that appeared in January 2026
Other or unspecified, Apr 24, 2026
When I decelerate my brake lights don’t flash to warn the driver behind me that I am potentially slowing down .
Other or unspecified, Oct 8, 2025
Rearview Camera is not displayed when the vehicle is placed in reverse. The display shows a black screen. A Recall Notice has been published for other vehicles of the same year, make, and model. The failure of the Rearview Camera results in safety risks during normal use of the vehicle.
Other or unspecified, Jul 7, 2025
I was driving around my neighborhood one day with my panoramic sunroof open and at the red light i wanted to close the sunroof (california summer sun is no joke) and it made this really big 'THUMP' noise, thought the sunroof glass cracked. After the big THUMP noise, the sunroof wouldnt close and this is after the light turned green so i am driving slowly because there was rattling noise coming from the sunroof and didnt want the sunroof to fly out from the car. So i had to pull over and try to figure out if its okay to drive with stuck sunroof with it rattling noise. after that i tried to close and open the sunroof and wouldnt move or do anything, it was just stuck. So i turned my hazzards on then drove slowly back home. after about 30 mins playing with sunroof in my garage, hoping that i will close (then at least i can still drive my car without being scared that it will fly out from my car), finally go it to closed but now it doesnt work at all. then i have found out that from 2014 to 2018 pano sunroof is known issue and there were safety recall on some pano sunroof already on this model. i called 6 places and they told me (besides from how many they had already repaired) the holder on the sunroof rail is broken so the whole rail assy needs to be replaced. imagine if i was on a freeway going 65+ and if this would have happend and this HUGE pano sunroof flew out from my car... this is very big safety issue and that probably why 2017 (same pano sunroof) was on a recall.
Other or unspecified, Engine, Jul 27, 2024
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 and I called on the 23rd of July and received a call from Ray Catena on the 24th for them to tell me that “they were told that the new plan from Mercedes is to bring my car in and they will clear code. That’s what they are told to do.” To me, this is NOT fixing the issue. I am a little aggravated because I bought my car on [XXX] and have NOT been able to feel good because not sure what ramifications will come with me driving my car with this issue. I was told that driving with this engine light on and code that it will not harm my car. They now say Mercedes was told to reset the code and that will resolve issue? I believe this is a band aid not a fix!!! I’m a little upset. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Other or unspecified, Jun 25, 2024
Was sold Car Feb,27,2024 from dealership the car violently vibrates at 60mph took it to 3 Repair shops
Other or unspecified, Mar 13, 2024
Sun roof not opening. Mechanic notified me that this is a known issue, but no recall at this time.
Other or unspecified, Feb 7, 2024
There are Water intrusion that happened to other Model of Mercedes, my car have the same problem, when i bring it to the Mercedes dealer, they found a lot of water inside the trunk, but they insisted that I had accident, but there no accident that I know of.
Other or unspecified, Jan 30, 2024
C300 Crankcase Ventilation Valve Code P052E
Other or unspecified, Dec 7, 2023
Panoramic roof suddenly shattered while driving on a clear day.
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.
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.
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.
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.
Other or unspecified, Aug 27, 2022
I have a 2018 C class. Purchased it with 32k mikes 12/21. April 2022 I started experiencing issues. When I put my car in drive/reverse the gears shift it’s self back to neutral. When I’m stopped at a light it will take me out of drive and shift it’s self in neutral. I’ve taken my car to the Mercedes dealer for a diagnostics paid out of pocket and they were unable to find the issue. This is a major safety concern and I would like to be contacted as it is unsafe to drive and no one seems to be able to locate the issue so it can be repaired.
Other or unspecified, Jul 30, 2022
Damaged cords on the soft top interior trim with the following characteristics: - Cord snapped - Cord worn - Cord torn out - Cord sheathing damaged Cause: Possible high tensile stresses on the cords during the soft top sequence
Other or unspecified, Apr 6, 2022
Engine light is on recently on my 2018 C300. Car has 36000 miles on it. It is diagnosed as the valve for the crankcase ventilation. The actuator was blocked.
Electrical system, Other or unspecified, Jan 6, 2022
The sunroof on the vehicle jams and either stays partially open or won’t close in the rear completely. I finally got it to close but it will not open again. I know multiple mercedes owners who have this issue with the sunroof and if the sunroof will continue to not lock properly this could be a hazard on the highway if the brackets were to break and the glass slides off.
Electrical system, Other or unspecified, Jul 8, 2021
To Whom It May Concern, I bought this certified preowned Mercedes Benz, and the recall is open. I have taken the car to the dealership, they deny me from service because its an over the air recall. The Mercedes Benz website clearly states on their letter for consumer that the remedy for this recall can be taken care at the dealership free of charge or an over the air update. Its July and I got the car back in February.
Other or unspecified, Apr 27, 2021
MERCEDES-BENZ HASN'T UPDATED THE RECALL ON MY VEHICLE
Other or unspecified, Mar 10, 2021
I WAS TOLD THAT THE PRESENT RECALL HAD BEEN REPAIRED. YOU STILL HAVE IT AS AN OPEN RECALL, WITHOUT A PRESENT FIX. HOW LONG DOES IT TAKE TO REMOVE A RECALL?