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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 110,083 (10,900–206,000)
6 model years affected: 2001, 2002, 2003, 2004, more2005, 2006
61 people reported this problem
Viewing 1 - 20 of 37 comments
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.
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.
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.
Has multiple leaks from some of the hoses located on the driver side
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.
ABC,,,,leaks fluid
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
active body control light continues to come on have owned it for only 3 months
Replaced the hydraulic pump
car dfoesnt raise
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!
Started leaking fluid and then dropped too low to drive in 2 days
struts leak, ABC light comes on $2900 to fix
In the shop, replaced the pump but it still go down. But after a while it rise up.
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.
active body control lines (steering/suspension) leaking $1800 repair estimate