sdwingnut

I did the valve swap this past weekend and did the same with the replacement hose. Pic below on the hose length that worked well for me for others who may be interested.

Another potentially helpful tip for others, using an 8mm (12 point) box wrench instead of an E10 torx on the bolt to the back right of the intercooler may work for you, *as long as the bolt isn't seized and you don't risk stripping the head*. With the length of the 3/8 and 1/4" extensions I had on hand, I could not get a ratchet (electric or otherwise) to fit into that space because of the throttle body bulge in that area. The 12 pt M8 wrench won't grip the bolt head as well as a 6 pt E10, but if you put enough pressure on the wrench to keep it flush with the bolt and go slow, you may (should?) get away with it. Do this at your own risk though.

ArcticWhiteZ51

All,

Anyone else successfully get theirs fixed for no charge using the letter above? We didn't get a letter but did buy our 2017 GLC300 new so it seems that still honor it if we brought in a scanned copy. ; )

Flying-Lo

im having a really hard time figuring out the right part number to order for a 2018 B-250. Is it the same as this part? Please help!

ArcticWhiteZ51

We took our 2017 GLC300 that was throwing this code. They agreed it needs to be repaced (under the extended warranty). Part is backorder with NO eta. Give me a break.....pun intended.

be69chevy

Just bought a used 2017 glc 300 with 85,000. No warranty. Got it at a Volvo dealership. Haven’t even made the 1st payment yet. Just got the PO52e code today. I cleared the code out but I am sure it will be back. Help!! Advice needed.

DanD.

Its covered by MB extended warranty. As soon as it comebacks take it to MB dealer for free replacement.

erickong43

Do you have the video for GLA250 ?

DJ170

Anyone know what the electric plug do ? Is it actually a motor or a heater for the valve ?

https://a.aliexpress.com/_mrVQltu

kcattorney

Eric: I just uploaded the video for the GLA 250. Here ya go:

Victor Scurtu

Got CEL P052E [0x052E].
2018 GLC-300 30K on the odometer.
The dealership here in Manitoba Canada wants $2300.
Called MB Canada asking if they have a plan to fix that factory flaw as MB US did to their customers.
Very numb folks at MBenz Canada.
Benz - Never again.

pjsr8509

I just went to the dealership for this check engine light code. My third time needing the same problem fixed. They confirmed I'm under warranty until 2031. The part is backordered and likely won't be in until the third quarter this year. The tech said it won't damage the car to drive it with this light on. The problem is if something else goes wrong, I won't be alerted do to the check engine light already being on.

I'm thankful Mercedes is taking responsibility for this problem. It's in their best interest to make this right. If they didn't, I would never buy another one.

DanD.

Three times? Wow, did they really replaced the parts first two times or just cleaned them?
Can you please post mileages when it happened?

pjsr8509

The dealer did Two (soon to be three) replacements. I bought it with 27k miles on it. Maybe it happened before then?

Mileage,Why does it matter? Take it to the dealer and get it fixed under Mercedes extended warranty.

FS4455

MB Canada is covering it now

Ghostdaddah

Hello and thanks to everyone who submitted incredibly useful information, pictures and and videos in this thread.

I recently bought a used GLC 250 in the European market with the error code:

P052E71 - The valve for crankcase ventilation has a malfunction. The actuator is blocked.

ItŽs awesome that MBUSA issued this extended warranty for you guys in the North American market for this issue. I am thinking of informing the press here about this; about how Mercedes keeps kicking the can down the road year over year, and finally issues an extended official warranty for US customers (after lawsuits?) but in rest of world will charge customers over $3000 USD to fix what seems to be a clear design issue with this engine. Not a good look for Mercedes, and the press actually likes these kinds of stories, so it might gain some traction... If IŽm not mistanken there are more and more German customers/activists who use the extremely useful information from the US NHTSA to argue against MercedesŽ practises in this regard.

In Europe -- the manufacturers get to keep everything secret from the customers, like they tried in the US with "dieselgate".

Here in Europe, the engine error P052E71 code does not even trigger the check engine light. Be aware, and buy your own OBD2 code scanner if you have a car with the M274 engine! Get one that can access Mercedes modules/codes. These scanners are relatively low cost, easy to use and can easily save you money as an owner/buyer/seller. From my limited knowledge of German and using Google translate, I read in some German car forums they speculate that Mercedes might have released a software version that keeps the check engine light off for P052 and P06DA, but I donŽt know if that is correct, it could be a false statement.
P06DA can be ignored as per Mercedes official statements in Xentry/TIPS. It is an actual malfunction however (a bad cable inside the oil pan) but the result is that the engine runs with full oil pressure all the time which is thought to be a good thing.

My independent dealer said they could fix the PCV valve and P052E71 code without replacing the whole vent assembly as per Mercedes recommendations, I agreed as they offered to do this at 50/50 cost sharing, and it was a reasonable price of around $400, compared to alternatives which always cost time and money anyhow. My official Mercedes dealer quoted around $3000 to fix this issue.

But, it turns out the work they did (replacing the high-load ventilation line) did not fix the issue and the error code is back. The work I paid for did fix a bad oil stink the car used to have, meaning it was necessary to perform anyhow, not a completely wasted effort. The high load line is the one with the flat round diaphragm on it, it leaks and causes an oil stink around the car, so if your car stinks burned oil it might be the high load (WOT) vent line that is bad.

However, I also need to fix the crankcase ventilation partial load line which triggers the error code. I donŽt want to pay for labor again so I hope to do this myself.

I was going to try to order A274 018 2101 "vent line" which seems to be correct, but here in this thread you order A274 018 7201?

Does any one know about A274 018 2101 ? Will it need to be spliced the same way or can just be connected in both ends without splicing?
I assume it does need splicing because disconnecting and reconnecting the new part is not possible on the oil separator end, hidden behind the motor mount?

If the splice works, as it seems it does, it should be good because replacing the PCV valve will be much easier later on.

P052E71 -- is this related to emissions only? How does driving around with this code affect the M274 engine over time? Is there no effect at all? Is this why Mercedes seem to ignore the code in other markets? I am a mechanical noob but otherwise a nerd so I read up on PCV systems and everything I found all state that this is a critical system for the engine. But Mercedes just ignores this on the M274 engine -- Why is that?

sn202020

AliE. seller described the same item as

A2740181200
A2740182101
A2740182201
A2740187201
A2740187301
So those are same or at least installable.

Ghostdaddah

Thanks! They probably all work if they are just spliced in? But maybe there is an "optimal" choice?
Looks like there are two revisions depending on year/options: A274 018 2101 and A274 018 2201
I found this for my car using VIN search but looks like the parts list is still generic, at least on the web site.


m274 engine, partial load vent line

sn202020

Just buy any.

And cut the long hose short.
And move to the shorter location
and use new screw clamp to make it air tight.

Then connect to the existing hose after cut it short.







or

maybe you can remove the whole long hose after warm up the hose with a hair dryer. Then connect directly, then add a clamp.

Ghostdaddah

Awesome, thanks for the detailed pictures!
IŽll ask nicely first if they want/can do warranty work on this, if not IŽll go this route :-)