2017 Mercedes-Benz C-Class
Problems, recalls and owner-reported issues
Engine is the leading concern among 253 owner complaints filed for this model year. This is the 11th highest complaint count among 23 C-Class model years with reports.
Of the 2017 reports, 12 involved a crash and 3 involved a fire. 17 people were injured.
What owners report most often
Recalls and investigations
No safety recalls on file.
Representative owner complaints
253 reports, newest first.
Fuel/propulsion system, Oct 31, 2023
I have a 2017 C 300 and it smells like gas when I turn my heat/ac on. I contacted Mercedes to see if there was a recall as this is a huge issue with many customers but Mercedes offered no assistance. The smell of gas is very dangerous and I think it's unfair to the customers that Mercedes has known about this problem but chose to do nothing.
Seat belts, Oct 30, 2023
The contact owns a 2017 Mercedes-Benz C300. The contact stated while the vehicle was parked in the driveway, the driver’s side seat belt failed to retract as designed. The contact stated that the seat belt was loose. There was no warning light illuminated. The vehicle was taken to the dealer to be diagnosed, but the vehicle was not yet diagnosed. The vehicle had not been repaired. The manufacturer was not made aware of the failure. The contact referenced NHTSA Campaign Number: 21V032000 (Seat Belts) as a possible cause for the failure. The failure mileage was approximately 8,000.
Forward collision avoidance, Oct 30, 2023
Front safety system inoperable
Engine, Oct 27, 2023
I took my vehicle to the mechanic due to the check engine light been on. The diagnostic came back to be that "The valve for crankcase ventilation has a malfunction. The actuator is blocked." As per mechanic this has to be replace but cost around $ 2,000 plus.
Other or unspecified, Oct 24, 2023
Factory AMG rims. 3 of the 4 rims have cracked. The last rim cracked with brand new tires. So it is not a tire issue. I find it unbelievable looking online how may others have had this problem with AMG rims. Does not seem acceptable.
Electrical system, Sep 30, 2023
Check engine light came up for a PCV valve error. Car was driving fine with no recent changes and the repair is going to cost over 2000$.
Fuel/propulsion system, Sep 25, 2023
My engine light comes on intermittently for days or weeks at a time. Code is P052E indicating an issue with the PCV valve. I'm waiting to replace the part.
Engine, Sep 24, 2023
P520E code which is caused by a crankcase ventilation issue. The fix costs upwards of $2000. It seems to be a common issue with Mercedes vehicles with 4 cylinder turbos and should be a recall on this system.
Structure, Sep 22, 2023
The vehicles panoramic sunroof does not close fully. There is a recall for certain Mercedes-Benz 2015 - 2020 C300 vehicles, my car is a 2017 C300, but for some reason my vehicle is not part of the recall. The recall number is 21V197000.
Engine, Sep 17, 2023
Piston one issue. I bought this car from an auction and according to the record on the car the previous owner had problem with piston one and low compression in that piston. After performing some research it looks like Mercedes’ Benz c300 m274 is riddles with this issue. It’s all over the internet and I don’t know why Mercedes is not taking responsibity for this. This car has less than 70000 miles and the engine is locked from the cylinder. Thank you
Engine, Sep 12, 2023
The Crankcase Ventilator Actuator has malfunctioned, resulting in the Check Engine light showing up. The MB C300 4matic 2017 vehicle is at 40,200 miles as of [XXX]. Lot of other MB owners have reported same issues. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Engine, Sep 2, 2023
My c300 2017 only had 55k and suddenly the engine light on, when I check it show that I need Positive Crankcase ventilation valve replace. it cost $2300.
Engine and engine cooling, Aug 28, 2023
The contact owns a 2017Mercedes-Benz C300. The contact stated that upon having the vehicle inspected, the check engine warning light illuminated. The vehicle was diagnosed and produced code: P052E. The vehicle was then taken to an independent mechanic where it was diagnosed that the Positive Crankcase Ventilation (PCV) failed and needed to be replaced. The vehicle was repaired. The dealer and manufacturer were notified of the failure and confirmed that the VIN was not included in a recall. The failure mileage was approximately 53,000.
Engine, Fuel/propulsion system, Lane departure, Aug 27, 2023
Check engine light came on, a day after purchasing from dealer. Mileage at 55k. Check engine light code was p052e71, confirmed from 2 auto repairers. One was Mercedes Benz who quoted me $3900 to repair. In the Mercedes Benz booklet warranty says emission related repairs are covered for 15 years/150k miles for hybrid vehicles.
Engine, Aug 19, 2023
Piston crack in Cylinder 1
Visibility, Aug 17, 2023
The contact owns a 2017 Mercedes-Benz. The contact stated that while driving at an undisclosed speed, she attempted to open the sunroof, but when she looked, she noticed that only the left side was open. The contact stated that the failure reoccurred on two occasions. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 100,000.
Other or unspecified, Aug 15, 2023
at approximately 48,000 miles driven the check engine light turned on when car was taken to the mechanic, code p052e71 came back as the problem, which means crankcase breather hose had to be replaced. the cost was almost 2000 dollars.
Engine, Fuel/propulsion system, Aug 1, 2023
My Mercedes Benz stopped working. The mechanic shared it involves the: fault valve for crankcase ventilation has malfunction.
Structure, Jul 24, 2023
The contact owns a 2017 Mercedes-Benz C300. The contact stated while driving 75 MPH, the front roof panel located between the windshield and the panoramic sunroof detached and flew off the vehicle. The vehicle was taken to the dealer and the contact stated that the vehicle had experienced the failure listed in NHTSA Campaign Number: 21V197000 (Structure) however, the VIN was not included in the recall. The vehicle was not repaired. The manufacturer was contacted, and a case was filed. The failure mileage was 41,700.
Structure, Jul 23, 2023
Basically, this is a common problem with the c300 coupes, I had an recall to replace front stationary sunroof panel. My sunroof panel started lift the last few months in 2022, therefore I took it to the dealership at the start of 2023 which they notified me this was a big problem and was unsafe on the road because it will eventually lift off while driving. Sense my engine lights were on and needed immediate attention, I had my car service which cost a lit of money. I had one problem about why would I be charged $400 for windshield seal which I assume was apart of the problem with sunroof panel seal. After car was in shop for quite some time, they fixed my sunroof panel that had an recall. About a month later, the sunroof panel was lifted and started to come off. I brought the car back into service which service advisor notified that he ordered about sunroof panel. I called the service advisor about once a week to check sunroof panel but I kept getting the run around for months. Finally, recently I went to another dealership and they told me that about 30 sunroof panel were in stock at near by warehouse which means the previous dealership was not trying to fix the problem but were happy to charge me 8k to fix my car. Please I need help with this situation and I will attach photo of invoice. Please I want to know of I can have another recall on the same particular problem. Thank you
Engine, Jul 15, 2023
Unknown
Fuel/propulsion system, Jul 14, 2023
I got a check engine lite and the code said positive crankcase ventilation regulator valve. While doing research I am finding out that this is a very common problem on these cars, and very expensive to fix, I’ve never even heard of this problem happening to other cars. I think a recall is in order, thank you
Engine, Fuel/propulsion system, Jul 8, 2023
Code PO52E
Engine, Jul 7, 2023
check engine code P052E : Positive Crankcase Ventilation Regulator Valve Performance. This is a common problem in all mercedes 2015-2020 and it cost about 2000 to repair. This should be a recall.
Engine, Jun 1, 2023
My car is throwing the error code P052E. It keeps going on and off.