Active Body Control System Can Leak Hydraulic Fluid on Mercedes-Benz S55 AMG

The active body control system can leak fluid from numerous areas, including the tandem pump, hydraulic lines, struts, and/or seals. If it is not repaired, the vehicle ride height could drop too low and cause damage to the undercarriage.

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Average mileage: 110,622 (10,900–206,000)
6 model years affected: 2001, 2002, 2003, 2004, more2005, 2006
56 people reported this problem
35 people shared problem details
Active Body Control light is on and the Steering wheel is so hard to turn. what shoul I do? Please help!!! oh and the Temperature needle went all the way to the top. I even added cooling fluid. Help!!! How much does this thing is going to cost me.
starting to notice regular ABC visit workshop messages. I keep my eyes on the Hydraulic fluid levels to ensure that the system doesn't run dry. Now car won't raise or lower, also noticing continuous drip underneath the car. Seems to be occuring in the front, near pulley but can't tell due to the frame. I can see fluid dripping from the bottom of what looks like the tandem pump, but could be coming from a high pressure hose connected to it, can't tell. Starting to prepare for a huge repair bill.
out of no where, fluid was pouring out under the car and after i popped the hood, saw all this fluid spitting out of the ABC housing/cap area. I'm scared of what this is going to cost. Had no warning or issues with the suspension prior.
My Abc pump is leaking from front seal. I disassembled the pump and i see that i must change the seal (28x40x7.6) and two or-ings.
Need new ABC pump.
I had a power steering fluid seal go bad and the garage that worked on it put power steering fluid in the ABC fluid housing which made the ABC system suck up the power sterring fluid and it caused the whole ABC system to go bad. mercedes fixed it, but it was $3000 to flush the system and buy a new pump.
Has multiple leaks from some of the hoses located on the driver side
ABC,,,,leaks fluid
Replaced the hydraulic pump
The container cap pupped out (or at least that is what I noticed when I looked under the hood) and most of the fluid had shut out all over my drive way, that is after my wife got home!
struts leak, ABC light comes on $2900 to fix
active body control light continues to come on have owned it for only 3 months
Started leaking fluid and then dropped too low to drive in 2 days
In the shop, replaced the pump but it still go down. But after a while it rise up.
car dfoesnt raise
Fluid is leaking from either the reservoir or a hydraulic line, red warning light on the dash is illuminated. Sucks after spending 8 K in other repairs on this car last year. You would think once you get the car almost paid off you could enjoy it for a while without a continuing large expense. Not happening
ABC Pump failure
I had the ABC pump replaced twice as well as some of the hoses and the ABC notification continues to come on whenever the suspension rocks. Mercedes should do a recall on this system. My auto shop told me recently (the same shop that replaced it twice) I need to replace my ABC pump. Does this ever end?
s55 -replaced a switch in ABC, drained ABC and happening again now in front. Dealership said it would probably happen again and that this is a known problem with a repair memo out but has no recall.
The car is stuck down, it won't lift up, I noticed that all of the fluid leaked out into the driveway. don't know where the leak is coming from. Filled in back up with fluid and it' all leaked out again.
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