p0299 code, anyone had to replace their turbo?
Thread Starter
Junior Member
Joined: Apr 2021
Posts: 29
Likes: 4
2012 mercedes cls550
p0299 code, anyone had to replace their turbo?
I hear they are crap mechanical products made in Lithuana, and when you need to replace them, the dealer charges us $3300. Not for brand new, but for RE-BUILT product from Lithuana.
WTF ? absolutely un-acceptable
WTF ? absolutely un-acceptable
Super Member
Joined: Jan 2017
Posts: 744
Likes: 144
From: Bay Area
W218 Stage 2, E85
Have not heard anyone else here having issues with their turbo, but I would clear the CEL and have another mechanic with Xentry check it out and see what they say. It is always better to get second opinion in case one is giving you a wrong answer bc that is an expensive replacement. I been through this when my "family" mechanic replaced a $500 part thinking it was bad, but it wasn't. It was the O2 sensor causing issues.
However, if you have to replace the turbo, and if you are into tuning the car for more power, this could be an opportunity to upgrade turbos to AMG pair for $5-6k in total lol. just saying
However, if you have to replace the turbo, and if you are into tuning the car for more power, this could be an opportunity to upgrade turbos to AMG pair for $5-6k in total lol. just saying
Senior Member
Joined: Jun 2020
Posts: 417
Likes: 182
From: Finland
2015 CLS550 Shooting brake 4-matic
I don't either believe that turbo failure. Those Garrett turbos won't broke so easy or how much is your car driven?
If u need to swap turbos go straight to AMG M157 turbos and some other modes.
If u need to swap turbos go straight to AMG M157 turbos and some other modes.
Junior Member
Joined: Mar 2020
Posts: 52
Likes: 11
2014 cls 550
where the bost controller is under the engine cover, pull the main feed line from both ends(1 behind the motor) and blow it out and check for oil. there is a little check valve on the back of the motor on the vaccume pump that often goes bad and oil in the line can result in the wastegates not staying in the line.
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Thread Starter
Junior Member
Joined: Apr 2021
Posts: 29
Likes: 4
2012 mercedes cls550
I no longer have the vehicle....but are you saying the problem is not the turbos itself ?
Would a faulty check valve cause a slight screech sound upon heavy acceleration? A screech sound was one of the symptoms I had.
Would a faulty check valve cause a slight screech sound upon heavy acceleration? A screech sound was one of the symptoms I had.
where the bost controller is under the engine cover, pull the main feed line from both ends(1 behind the motor) and blow it out and check for oil. there is a little check valve on the back of the motor on the vaccume pump that often goes bad and oil in the line can result in the wastegates not staying in the line.
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Junior Member
Joined: Dec 2023
Posts: 39
Likes: 2
2015 Gl450
Hello gents,
Got back from the dealer today. They were able to replicate the issue with hard shifting to the 4th gear and their diagnostics see no other code than P029900, which is low boost pressure of turbocharger (driver's side). Guided test showed Y77/1 valve does not have correct duty cycle. Vacuum tested waste gates and found the left side internally leaks down.
Offered solution - replace the left turbo, which is almost $4K, including everything. No TCU codes or anything related to the tranny. They explain that there's not enough air to provide smooth shifting and this is the culprit. I can buy this when I'm accelerating and it shifts down from 5th to 4th to have more power, but when I'm decelerating and it goes from 7th to 4th I'm wondering how it happens at all.
I doubt this is going to help, but who knows... The only concern now is the price. I saw some used turbos from junk yards are around $500 (up to 70K miles on them), plus labor. So thinking of doing that in a few weeks maybe.
Any suggestions or thoughts?
Are there any ways to fix that internal leakage? Or the part is worn out an need to be replaced?
Got back from the dealer today. They were able to replicate the issue with hard shifting to the 4th gear and their diagnostics see no other code than P029900, which is low boost pressure of turbocharger (driver's side). Guided test showed Y77/1 valve does not have correct duty cycle. Vacuum tested waste gates and found the left side internally leaks down.
Offered solution - replace the left turbo, which is almost $4K, including everything. No TCU codes or anything related to the tranny. They explain that there's not enough air to provide smooth shifting and this is the culprit. I can buy this when I'm accelerating and it shifts down from 5th to 4th to have more power, but when I'm decelerating and it goes from 7th to 4th I'm wondering how it happens at all.
I doubt this is going to help, but who knows... The only concern now is the price. I saw some used turbos from junk yards are around $500 (up to 70K miles on them), plus labor. So thinking of doing that in a few weeks maybe.
Any suggestions or thoughts?
Are there any ways to fix that internal leakage? Or the part is worn out an need to be replaced?
Member
Joined: Oct 2020
Posts: 223
Likes: 82
From: Phoenix, AZ
2013 Weistec 540/715 tuned CLS 550, 2008 E350, and '07 Jaguar S-Type R
Why would they replace the turbo if this is a wastegate problem? Are the two integral?
Unless this car has exceptionally low mileage, I would buy the cheapest turbo I could find if the turbo has to be replaced. If the price was right, I'd do them both and sell the good one to recoup some $$$.
Unless this car has exceptionally low mileage, I would buy the cheapest turbo I could find if the turbo has to be replaced. If the price was right, I'd do them both and sell the good one to recoup some $$$.
Junior Member
Joined: Dec 2023
Posts: 39
Likes: 2
2015 Gl450
Probably because that only part cannot be replaced by itself as it doesn't exist with its own part number. Thus, as an official dealer they recommend to replace it as a whole.
The car has 96K miles, I bought it when it was 95K.
The car has 96K miles, I bought it when it was 95K.
Member
Joined: Oct 2020
Posts: 223
Likes: 82
From: Phoenix, AZ
2013 Weistec 540/715 tuned CLS 550, 2008 E350, and '07 Jaguar S-Type R
Yeah, I see where the thing is sold as a complete assy even including the exhaust manifold. A new Garrett unit lists for $2,474.00.
Personally, I would go THIS ROUTE as long as I could confirm it is, in fact, thoroughly rebuilt.
Personally, I would go THIS ROUTE as long as I could confirm it is, in fact, thoroughly rebuilt.
Junior Member
Joined: Dec 2023
Posts: 39
Likes: 2
2015 Gl450
That one is a bit different than mine. I have 2015 GL450. And new item from dealer is around $2,200 for the left side. I'll try to find another local shop to consult with and ask if they can work with some parts on it.
