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Active curve system malfunction?

Tiny
PAABS
  • MEMBER
  • 2016 MERCEDES BENZ GLS63 AMG
  • 4.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 1,220,000 MILES
I have been experiencing oil pooling and showing signs of leakage even after driving on the active curve system reservoir I had diagnosed it and I had a fault code of low oil pressure in the back stabilizer.
Sunday, July 7th, 2024 AT 3:31 PM

12 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Usually the shock will start to leak but to be sure you will need to raise the car up and inspect the rear suspension with a flashlight. Here are the components for the Active Curve System and how the system works. Check out the images (below). Please let us know what happens.
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Monday, July 8th, 2024 AT 11:25 AM
Tiny
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Thank you for your reply in response the problem is in the hydraulic oil reservoir for the ACS whenever I top it up the oil will be rejecting back and I could see signs of foaming especially if the car is on and running so I ran a diag on it and it showed low oil pressure in the rear stabilizer.

And I happened to come across a xentry tip manual to help I have been having difficulty with being able to know how to bleed the ACS system I will attach the file.
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Tuesday, July 9th, 2024 AT 12:00 AM
Tiny
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I appreciate it your further help with this Information.
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Tuesday, July 9th, 2024 AT 12:05 AM
Tiny
KEN L
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Thanks for the information, it could be foaming because the system is low but until the leak gets fixed it will always be low. It says you must do the bleeding with a scanner to open the control valves and no foam can be present.
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Tuesday, July 9th, 2024 AT 9:48 AM
Tiny
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But the issue was I have checked and no leaking it just seems to be that prior to this foaming incident there was mistake when the car was previously worked on at that time the hydraulic system pipe was interchanged with a coolant pipe and caused water to enter into it. Then I bled it to purge out the water but now it seems I have to bleed to purge out air from the system. Do you have any idea how I can go about it further?
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Tuesday, July 9th, 2024 AT 10:46 AM
Tiny
KEN L
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Gotcha, here is how to add and bleed the active curve management system. Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.
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Tuesday, July 9th, 2024 AT 3:49 PM
Tiny
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Thank you very much. I will reply with pictures very soon. I am about to try again with the Information you shared.
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Wednesday, July 10th, 2024 AT 12:58 AM
Tiny
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Hello, so I tried your information maybe it might be that I am not doing right.
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Wednesday, July 10th, 2024 AT 6:32 AM
Tiny
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This is a picture and video of what I am battling with.
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Wednesday, July 10th, 2024 AT 6:33 AM
Tiny
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This is a video.
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Wednesday, July 10th, 2024 AT 6:37 AM
Tiny
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And I have also checked for Leaking in other areas and everything is okay, but still foaming is present. Is it possible for the Hydraulic pump to get spoilt and also cause this to be happening?
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Wednesday, July 10th, 2024 AT 6:39 AM
Tiny
KEN L
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Yep, it looks the pump has a crack in the suction side of the pump housing which allows air to enter the system. Thanks for the video it helps, You can call mercedes and tell them what's happening and they may know what it will cost. Please let me know what happens.
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Friday, July 12th, 2024 AT 9:04 AM

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