[Gizmostank]

My 2019 GLC300 has 90k miles, all mine from original purchase. at about 40k miles I had intermittent Check Engine light come and go for weeks at a time. When I took it in they said that it was throwing a code for the PCV valve but at the time the light was off and I moved on, the light stayed off until about 2 weeks ago. So about 50k miles later but same code and this time it isn't clearing itself. Also had service tech manually clear it and it came back on fairly quickly. Car is running fine, if that matters.

My question is as follows. I can't find anything on a PCV valve specific to my car, MB dealer tells me that my car has a Crankcase Oil Separator and not a PCV valve and that it will require 8 hours service to replace. I also can't find anything online about an Oil Separator specific to my car, not a single part or discussion, article, anything.

Can someone here help me understand my options? I am not afraid to get my hands dirty if it will save me a significant amount of money, but alternatively if the part (whatever it likely is) can be manipulated back into working order rather than replaced that could be a better option for me. I am trading the vehicle in to MB in 1 month and want the light off so that my trade in value wont be impacted.

Thanks in advance.

 

[Arnab]

My 2018 GLC300 has only ~36k miles and my Check Engine light came on a few weeks back. It was due for a service and so I waited. The service happened today and feedback from the service center is to replace Crankcase Valve / Oil Separator. The cost: ~$2k. They did not have the parts and therefore I need to go back again.

I was wondering why such a high cost!!! And I found this post... 8 hours service, possibly that's why. I will keep watching this thread to see if there is any alternative suggestion.

 

[aromac]

Dealing with this exact issue now on a 2018 GLC 300 4 Matic with 68000 miles.

Was also told the same thing about the Crankcase Oil Separator and not the valve.

I have seen on some other models that there is separate valve part for $40 (

). Was hoping to find that as a quick fix to try before spending $2k. I can't find this part!

 

[Joe L]

I have a 2015 C300 (68k) which is on its 3rd PCV assembly, and my wife's 2017 GLC300 (52k) is on its second. Only had to pay for one so far because of warranties and a little bit of "assertiveness" with the person at the dealership.

I have done a lot of my own repairs on previous Mercedes we've owned, but some genius engineer put the PCV assembly in a location where it gets a lot of heat, and is almost impossible for a backyard mechanic to repair.

 

[Blade Gunner]

I was concerned about carbon build up on the intake valves due to the GDI engine in the GLC63. I was thinking of putting a oil separator catch can in. I called Weistec who told me it’s not needed because of the engine already has an oil crank case separator. Can anyone confirm its location(s)?

 

[Mercedes Suck!]

I have the PCV code pop up on my 2018 GLC300.....with about 35K miles. I find it utterly ridiculous my dealer wants to charge me $2K for repair. I bought this car just before I retired....buying what I thought was a reliable vehicle from a reliable manufacturer. With the thought, I would not have to spend much time or money on repairs. Such BS! My previous problem that was caught just b4 my warranty expired.....my radio and xm radio stopped working. Took HOURS to repair and part needed to be ordered. Never had these problems with any other car in my life. First recommendation.....DON'T BUY A MERCEDES! Second recommendation and I should have known......MERCEDES REPAIR AT DEALERS ARE NOT CHEAP! I think the car is junk and should have stuck with Cadillac. Owned 4 and NEVER a problem......NEVER!

 

[aromac]

Following up on my experience. Ended up taking it to euro shop in Doral. Part and labor = $1900ish. They did mention it was a hassle to get to and fix. This was on 2018 GLC300 4Matic with 68k miles.

 

[Pamlaw]

2017 with 42k miles. Engine light on. My mechanic, a certified Mercedes’ tech, diagnostic shows “valve fo crankcase ventilation has a malfunction. Actuator is blocked”. Mechanic says he has seen approx. 5 GLCs with this problem (he has one). $2500 due to time to repair and then no warranty on work. He says not worth the repair as never seen the consequences of not repairing. Going on a 700 mile drive to the Cape tomorrow. Told me to have a nice trip. What do you think?

 

[Sanchezrosa]

I am having the exact same issue. They are telling me it’s the PCV Valve and the crank case oil separator. Just for the PCV they are charging $1800+ Tax. I didn’t even ask about the crank case oil separator. Would you guys recommend I get this fixed or just sell my car? I have a 2018 Mercedes Benz GLC 300 4Matic

 

[Sanchezrosa]

2017 with 42k miles. Engine light on. My mechanic, a certified Mercedes’ tech, diagnostic shows “valve fo crankcase ventilation has a malfunction. Actuator is blocked”. Mechanic says he has seen approx. 5 GLCs with this problem (he has one). $2500 due to time to repair and then no warranty on work. He says not worth the repair as never seen the consequences of not repairing. Going on a 700 mile drive to the Cape tomorrow. Told me to have a nice trip. What do you think?

I am on the same boat. I am honestly thinking of just selling my car. I had two mechanics tell me to just get rid of the car. It runs smooth and no issues. Just the check engine light came on and now with same issues.

 

[Ren]

My 2019 GLC300 has 90k miles, all mine from original purchase. at about 40k miles I had intermittent Check Engine light come and go for weeks at a time. When I took it in they said that it was throwing a code for the PCV valve but at the time the light was off and I moved on, the light stayed off until about 2 weeks ago. So about 50k miles later but same code and this time it isn't clearing itself. Also had service tech manually clear it and it came back on fairly quickly. Car is running fine, if that matters.

My question is as follows. I can't find anything on a PCV valve specific to my car, MB dealer tells me that my car has a Crankcase Oil Separator and not a PCV valve and that it will require 8 hours service to replace. I also can't find anything online about an Oil Separator specific to my car, not a single part or discussion, article, anything.

Can someone here help me understand my options? I am not afraid to get my hands dirty if it will save me a significant amount of money, but alternatively if the part (whatever it likely is) can be manipulated back into working order rather than replaced that could be a better option for me. I am trading the vehicle in to MB in 1 month and want the light off so that my trade in value wont be impacted.

Thanks in advance.

Hi. Have you found a solution for this problem? My 2017 glc is having the same issue for the past 7 months. Moreover, i mentioned the light comes and goes with the weather change. I think it might be some kind of a contact issue.

 

[llander]

I have the exact same issue; 44K miles GLC 300 and it is no longer under warranty for the "valve" issue on the crank case ventilation line - service person said because MB doesn't make just the valve that they need to replace the vent line ($498) and labor is $800. I looked at buying a bumper to bumper extended warranty ($5100 but figure will sell in a couple of years and buy electric. Any solution to this engine light issue due to the vent line valve malfunction?

 

[The Worst and Nothing]

2019 GLC Hybrid now on its 3rd PCV valve replacement at less than 40k miles. Mrs. goes to pick up car (it is cold outside) car/ motor is shaking violently, Dealer double checks and says no fault codes thrown. Car should be fine we are told.

Anyone have thoughts to what is causing this to happen? Car is still at dealer getting checked again for a second time.

 

[bob_4997]

I am having the same issue with my @018 GLC300 crankcase ventilator. The dealer says it ok to drive as long as the valve doesn't change position as I will get lots of smoke out the back and if I don't stop I could blow the engine.
Seems avery common problem. Mercedes should resolve this issue.

 

[The Worst and Nothing]

I am having the same issue with my @018 GLC300 crankcase ventilator. The dealer says it ok to drive as long as the valve doesn't change position as I will get lots of smoke out the back and if I don't stop I could blow the engine.
Seems avery common problem. Mercedes should resolve this issue.

Guess I am not the only one .
Looks like a bad motor mount is culprit of shake vibration. Part has been ordered and repair is this week. Fingers crossed it solves the issue.

 

[marcoVR6]

I am having the same issue with my @018 GLC300 crankcase ventilator. The dealer says it ok to drive as long as the valve doesn't change position as I will get lots of smoke out the back and if I don't stop I could blow the engine.
Seems avery common problem. Mercedes should resolve this issue.

You'll blow the turbo shaft seals, then you're good for a new turbo...

 

[bob_4997]

Guess I am not the only one .
Looks like a bad motor mount is culprit of shake vibration. Part has been ordered and repair is this week. Fingers crossed it solves the issue.

so are you saying the loose motor mount caused the ventilator malfunction

 

[The Worst and Nothing]

so are you saying the loose motor mount caused the ventilator malfunction

Hello, No it was an unrelated issue to the PCV valve. I was wondering if it had something to do with PCV malfunction. One motor mount went bad & has been replaced.

 

[redmcmac]

Same issue here. 2018 GLC300 with just under 50K miles. Does anyone know if this is something that would normally be covered under a warrenty?

 

[The Worst and Nothing]

Same issue here. 2018 GLC300 with just under 50K miles. Does anyone know if this is something that would normally be covered under a warrenty?

Yes, have had PCV valve replaced 3 times under warranty.