Active Body Control System Can Leak Hydraulic Fluid on Mercedes-Benz S600

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: 74,589 (11,700–135,000)
11 model years affected: 1997, 2001, 2002, 2003, more2004, 2005, 2006, 2007, 2008, 2009, 2010
51 people reported this problem
Viewing 1 - 20 of 26 comments
ABC fluid leaked out while sitting in the garage called MBUSA. This company does not want to admit that there is a serious problem with these ABC systems. However they put the blame on the dealer. My dealer in SC has supported me fully with the repairs. Current owner of two Mercedes Benz MBUSA will never have to worry about me owning another one. My dealer is great, but the customer service of MBUSA backing their inferior product convinced me that MB has lost its edge on quality. PRODUCT AND CUSTOMER SERVICE!
high pressure hose of abc system (the one that comes to top of car then u's and goes back down) popped a hole lost all fluid fixed hose now year later 65000 miles other side pops and down again till buy another hose and fluid this is crap mercedes knows they need to fix this problem
At first the car just slumped on the driver's side, but then I started getting ABC warnings every time I hit a dip in the road followed by a complete failure of the ABC. The suspension stopped suspending the car
Puddle of ABC fluid on garage floor after sitting 2 months until winter passes. Was in shop 5k miles ago for ABC damper replacement. Very poorly engineered car with multiple problems other than ABC. I can expect a major repair bill every 1000 miles. Average of $1000 to $2000 per repair. Garbage car. Garbage engineers. Garbage Dealerships.
This is the third time I had a problem with the ABC system. The first time I heard a pop sound and found that some oil was leaking, then six month later the problem happen again, with oil leaking again, and now again. Why can't the Mercedes Dealership fix the problem right the first time.
I've got the red warning on the dash board (ABC Control Unit - visit the nearest service) and the car went down by few centimeters. The car is in service right now and they don't have the required hose on stock. The labor will be huge as they (apparently) have to lift the entire engine to reach to that are. I should expect a high price.
Active Body Control System Can Leak Hydraulic Fluid
Verified for the Mercedes-Benz S600

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.

Having the same active body control, spent too much money already fixing it
lost power steering and had towed to benz dealer in fl with an estimate of 3700 for a hose and strut rear leak for a car that cost over 140,000 when i bought it new and all the complaints about this mb needs to step up to the plate and resolve this issue or im goning to miss mb and go to cadillac or lexus
Failure of ABC hydraulic pump due to fluid leak in line
Leaking fluid; ride height compromised. In for repair discussion tomorrow. Just flushed brakes 5k ago; not sure if there is any relationship, probably not.
Same problems witqh the hydraulic dropping too low. Had it fixed many times. Still have issues.
ABC suddenly lurches down and then up. It's a terrible problem and car has only 40,000 miles on odometer. For a $160,000 car new, I feel ripped off.
According to my independent Mercedes repair shop, I broke two hydraulic hoses, lost most of the expensive fluid and damaged the pump. Had it towed to the shop, "repaired"- two hoses, pump, fluid, but no new filters for over $2800, and took 3 weeks! New pump (rebuilt) is noisy, but supposedly warranty good for a year, we'll see what happens next. Car is a 9.5+, but the ABC is a time bomb!! No more Mercedes!!!
Car just sank when it's not running, Dealer relpaced bunch of parts (again $$$$) the car still have the problem with rear suspension.
I was driving and noticed that I had a red warning light on my dash display that read "Active Body Control Drive Carefully". I've had a 2000 S430, a 2001 S600, and a 2004 S430 all prior to my current 2006 S600. I stopped my car, observed how the rear left portion of the car was sagging rather far down, and assumed the strut was going bad as I have had to replace both rear struts on the air suspension of the 2000 S430. So I immediately drove it to the shop to get a confirmation on that. They of course wanted to do a test before confirming it was indeed the problem. $650 for an ABC fluid flush and then put it on a machine to test each strut to check if there was a piece of dirt in the ABC system or if the strut was going bad. Well I knew the strut was bad (or so I thought based on past experience) and asked how much the one strut would be and it was $1400-$1600 with labor (surprise, surprise). Then made an appointment to just have a new strut done. The next day, today, I had to take my car out to another shop to have a parking sensor replaced yet again and after I get there and the car goes in the garage, a large portion of the ABC fluid had leaked onto the garage floor. Well it was obvious that one of the lines was leaking since the fluid came from the front and I had a problem with the rear sitting low. I have yet to get a quote for that since they have to pin point the exact location of the leak but I am assuming this will cost $400-$700 to fix.
Active Body Control Drive Carefully shows up on the dashboard. Open the hood, can see a lot of fluid came out of the ABC pump
right side hydraulic pump not keeping hydraulic fluid
SBS light on
Car displays a error "body" and dings loudly when hit a bump
When the was parked in the garage after a week it would leak down on right side.upon cranking it would return to up position.Next leaked refilled then the leak was instant I put it in and it leaked back out on the floor.upon inspection
the ABC Hydraulic pump was leaking. so now I want to keep the it OEM so now I must replace the abc hyd pump.I have two Mercedes a 2006 S430 I replace the OEM with Struct Masters its ok I miss the orig sys. How ever I saved the labor because I did it my self in only two more hours that the shop I took my sweet time lunched too.Job completed and money in pocket no the Dealer Ship.I like my MB's but the cars have factory issues and no one stands up to Mercedes.The NTSB or NHS safety should speak for us all the problem is fact on all the same systems in each year of the S class and E.