Hi i have seen lot of customers have filed this cause happening in all 2015 to.2018 c300 its crank case vent valve needs to be changed every 30 to 60k miles lt of posts i have seen i just want mercedes to recall this problem.as its $2400 to fix this because something they didnt did right and part goes bad. Pls help.us reach this so they can do recalls why we have to pay 2400

- Valley Cottage , NY, USA

I took my vehicle to the dealership to have recall worked on (top sunroof panel) apparently they refused to work on it because my sunroof is not working. I received a letter after i financed the vehicle stating that there was a recall so to take it in to the dealership and if sunroof needed to be fixed it would. Long story short, back in July the panel detached from my vehicle while i was on the freeway. Thankfully I didn-€™t cause an accident but I would like some help so the dealership can fix the recall.

- Mesa, AZ, USA

Crankcase ventilation (PCV system), on C300 and GLC 300 is a know issue with this model care fro 2015 to 2021, yet Mercedes Benz manufacture the cars the same way with addressing in order to over charge customers and claim it-€™s a wear and tear part

- Valley Stream, NY, USA

This is in regard to my 2015 Mercedes Benz C300 4 matic. I was driving at the normal speed of approximately 65mph on the highway. When out of nowhere, I heard a very loud wind noise. I was terrified since I was alone and was not sure why or what happened. I pulled over and noticed the front panel of my Sunroof glass was missing. I was very disappointed as I have always believed that MB has had a strong reputation for their cars. I circled back around and was able to find the part on the side of the highway, but it was broken. I have had heavy-duty tape covering the space so water cannot get in. I contacted my local MB repair shop and told me the part would be $1100 and labor would be additional.

- Stuart, FL, USA

PCV valve

- Portland, OR, USA

The crankcase ventilation valve has gone out on my car. This is a continual problem with these vehicles at low mileage. Mercedes Benz should recall the part for repair as they stated it could damage the engine.

- Weatherford , TX, USA

I keep getting a litany of warnings on the dash.

- Rockville, MD, USA

Recall 2021070010----NHTSA #21V197--Panoramic roof not boned correctly to the vehicle during prior replacement -

- Chesterfield, VA, USA

The car have anew recall Recall #2021070010. The dealership Garage Isla Verde won-€™t provide me any type of services to my car. Neither repair this safety recall. They cancelled my appointments because I-€™m not welcome to the dealership.

- Penuelas, PR, USA

on 7/17/21 the piece of the top of the car right from the from window leading to sunroof came undone and flew off while on highway. vehicle was repaired a month later at body shop. this was out of pocket due to not wanting to claim on my insurance due to deductible. This piece flew off at a high velocity with no warning and couldve caused a accident. There was no indication of any issues no lights no warnings signs. There was a loud noise like a brick or large object falling on top which then I heard a lot of air. Recently again in October 5 I was driving on the highway and debris hit my sun roof, my window was shaking and I went to the body shop. in the brief drive there some 10 miles the same plastic part repaired was lifted and coming off. on this occasion I used my Insurance. On 03/2/22, another event in which the plastic portion between front window and rooftop flew off while driving 60mph on the highway.

- Rowlett, TX, USA

The panoramic sunroof of the C300 is held in plastic hooks that break, even with normal use. So, that leaves the panoramic roof to fly off the vehicle on the highway. I have not opened my roof in three years because I am afraid it might not hold up. Looking at the MB owners' forum, it seems to be a pretty common issue that these plastic hooks break, and then the panoramic roof either doesn't close all the way, stay up to let the air come underneath it to introduce the risk of it flying away, or become really flappy when driving with open roof.

- West Chester, PA, USA

On July the 8th I was driver on interstate highway 65south in Birmingham Alabama in my 2015 Mercedes c 300 when there was a loud thump which startled me and almost caused an accident what happened is the roof panel between the windshield and sunroof flew off it caused damage to my vehicle and almost an accident now when I contacted Mercedes they say that it is a recall out for this problem but they do not have a time as to when this can be fixed this will be a problem because now I am not able to drive my vehicle because there is a gape between the windshield and the roof where water and anything else will get into the vehicle this is terrible now I am without a car for who knows how long.

- Birmingham , AL, USA

Driving down the interstate and half of the stationary roof panel dislodged. Luckily no accidents occurred due to the malfunction. The other half is still loosely attached and I am worried it could cause an accident if it detaches. I have emailed and called headquarters as well as my local dealership and no one has the ability to fix the problem and cannot confirm if I choose to pay out of pocket, that I will be reimbursed. There is a recall and it-€™s #21V197. At this point I want some sort of solution so I can ensure the safety of myself and those driving around me.

- Fort Worth, TX, USA

My daughter was driving at freeway speeds, when she heard, what we now know, is a portion of the sunroof panel flapping and break off. There was no warning, no instrument indication, and assume the broken part was a safety hazard to vehicles following. We took her vehicle to Fletcher Jones Mercedes in Newport Beach, but they're hesitating about repairing or reimbursing costs, due to the pending nature of the NHTSA Recall #21V197.

- Castro Valley, CA, USA

While driving my 2015 Mercedes Benz C300 4matic with panoramic roof one day on rte 9 in hyde park NY, a 2 lane state road I was traveling at 40 mph, I suddenly heard more air than usual and then seconds later a loud flapping noise on roof. I pulled over immediately only to find the stationary roof panel all the way forward on the roof, (directly in front of glass portion of the pano roof) became loose on one side and flapped open with wind when in motion. I used 3 quarters between windshield and said panel to hold it from popping up while driving and drove immediately to a body shop. Tbey inspected it and determined it was held down with black epoxy similar to what is used to install glass such as windshields. They added some epoxy and taped down the piece for me. Approximately one week later I was traveling on the same road at about 30mph and suddenly all within like 2 seconds heard loud wind, then flapping, then saw the roof piece fly off swing in front off windshield it was still attached to a rubber gasket, then up in the air and back down and smacked the side of drivers door before breaking free and flying down the road behind me. Luckily it did not strike any cars or people as it briefly held on to the gasket attached. I immediately stopped and was able to retrieve it, broken into 2 pieces. Some online research found this has been a very common problem with many, many people who posted all ovwr the internet on facebook and several other sites. I then found the exact same problem, and part was recalled by Mercedes for 10S of thousands if cars, but the recall did not include my year (but did include my model for other years). This is very obviously the same exact problem and should be covered for all years by Mercedes. I called and after a lengthy phone call with Mercedes Benz I got nowhere. The agent for mb refused to even admit it was a recall, and was rude.

- Hyde Park, NY, USA

Check engine light keeps coming on/ fowl order coming from ac unit/ loud gas smell when start ignition in the morning

- Ellenwood, GA, USA

Sunroof no longer closed shakes and rattles, seems like a safety issue during a possible rollover

- Alhambra, CA, USA

When driving on the bridge the piece of my sunroof flew off I pulled over it was raining and the inside of my car got wet the motor on my sunroof no longer works as the water leaked through. I picked up as much of the pieces as I could but the part was run over.

- Ponchatoula, LA, USA

The vehicle was thankfully noy in mption when my panarama sunroof and the shades failed. The shades I understand its not a safety problem, but the sunroof not being able to hold in place as it opens is different. When the sunroof opened, the rear of the roof was not in place and shaky. When I tried to close, it had not locked itself right back in place, where I had to take it to a mechanic just to have it shut to avoid the rainstorm yesterday. I recently did some research and read through some articles, had a friend of mine take a look at it and it seems to be very similar, almost the same as the recall they have done on other year make for the panarama roof.

- Ellicott City, MD, USA

Engine light fault po52E crankcase ventilation valve fault mechanic decline repairing. Said its a common problem or defect in all C300 Mercedes Benz

- Largo, MD, USA