No boost?
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2012 c63 AMG, 2011 GLK 350, 2019 GLS 450
No boost?
My 2019 gls 450 isn’t making any boost. Just running on an all motor car. It’s very slow but drives without hesitation miss fire or any issue. It can get up to any speed just takes a bit. Someone would just think the car is very slow. There is no check engine light or stored code. I don’t know what this could be. Any thoughts?
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From: New Hampsha
'17 GLS450, '14 GLK250, Grandpa's Roadster
Thread Starter
MBWorld Fanatic!
Joined: Apr 2015
Posts: 1,219
Likes: 147
2012 c63 AMG, 2011 GLK 350, 2019 GLS 450
I agree. However that is what is happening. Live data showing zero boost. Can get up to speed and drive around fine just takes time with zero boost. Running on motor only. When I scan it says no codes. I’m leaning toward boost sensor but I would think it would trigger a code.
Last edited by AMGonFire; May 9, 2026 at 04:14 PM.
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My 2019 gls 450 isn’t making any boost. Just running on an all motor car. It’s very slow but drives without hesitation miss fire or any issue. It can get up to any speed just takes a bit. Someone would just think the car is very slow. There is no check engine light or stored code. I don’t know what this could be. Any thoughts?
I agree. However that is what is happening. Live data showing zero boost. Can get up to speed and drive around fine just takes time with zero boost. Running on motor only. When I scan it says no codes. I’m leaning toward boost sensor but I would think it would trigger a code.
Here is yet another model:
https://mbworld.org/forums/w213-amg/...hing-else.html
https://mbworld.org/forums/c63-c63s-...ull-boost.html
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OP, I saw your other post in another thread, the M256 usually don't have the failing check valve issue, that said, the model's forum you replied in (the c 43) there is a thread going with a "low boost issue" https://mbworld.org/forums/c450-c43-...-behavior.html that you can read but unlikely related to what you have. When you said no stored code, did you use a scanner capable of reading MB codes and not just something generic?
Here is yet another model:
https://mbworld.org/forums/w213-amg/...hing-else.html
https://mbworld.org/forums/c63-c63s-...ull-boost.html
Here is yet another model:
https://mbworld.org/forums/w213-amg/...hing-else.html
https://mbworld.org/forums/c63-c63s-...ull-boost.html
That being said... OP, any update?
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Thread Starter
MBWorld Fanatic!
Joined: Apr 2015
Posts: 1,219
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2012 c63 AMG, 2011 GLK 350, 2019 GLS 450
im at a loss. I replaced the boost sensor. Waiting on delivery of that vacuum check valve but that wouldn’t be the issue. Checked for leaks and used a scanner to check the operation of the waste-gates and they both operated on command from the scanner. So far no luck. Might have to take it to the pros.
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MBWorld God!
Joined: Dec 2019
Posts: 32,665
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im at a loss. I replaced the boost sensor. Waiting on delivery of that vacuum check valve but that wouldn’t be the issue. Checked for leaks and used a scanner to check the operation of the waste-gates and they both operated on command from the scanner. So far no luck. Might have to take it to the pros.
https://mbworld.org/forums/c450-c43-...-behavior.html
https://mbworld.org/forums/e-class-w...-0tt-m278.html
MBWorld Fanatic!
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From: New Hampsha
'17 GLS450, '14 GLK250, Grandpa's Roadster
Can you monitor the position of the wastegates? If they are closed and you have no boost then it sounds like you have a turbo issue, or a severely restricted intake. Try monitoring intake manifold pressure to see if it acts like a normal normally aspirated engine.
I once fixed a turbo performance issue by removing a shop rag from the intake...
I once fixed a turbo performance issue by removing a shop rag from the intake...
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