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.Google+
Car Problem Reports
Mercedes-Benz SL550 Active Body Control System Can Leak Hydraulic Fluid
Mercedes-Benz SL550 Problem
Average Mileage: 48,700 mi (23,000 mi - 85,000 mi)
Visitor, 2009 Mercedes-Benz SL550, 28,400 mi
ABC hose broke- $1600 to repair
Visitor, 2008 Mercedes-Benz SL550, 56,000 mi
ABC pump making noise and not covered under warranty. Cost to repair $4400. I'm trading the car in.
Visitor, 2007 Mercedes-Benz SL550, 52,000 mi
Leak and repair cost $2600
Visitor, 2008 Mercedes-Benz SL550, 46,000 mi
Suspension hydraulic pump replacement - $4,000
Visitor, 2009 Mercedes-Benz SL550, 38,000 mi
My car started bouncing as I was driving down the road and the ABC red warning light came on. I looked it up in manual and it
said to pull over and not drive. Had to have car towed into dealership and lucky for me, it was covered under warranty. The ABC system had failed!
A year later, there was a leak in the hydraulic system and it was also covered under warranty.
I now have 64,000 miles and took in for scheduled service and the ABC pulsation damper needs replacing ($1143).
The car makes a whirling sound and it also makes a knocking noise when slowing down?
Visitor, 2009 Mercedes-Benz SL550, 66,500 mi
ABC Malfunction warning on. Fluid leak visible under vehicle. Steering is impossibly hard.
Visitor, 2007 Mercedes-Benz SL550, 85,000 mi
leak in pressure hose. Install new hose& fluid $700
Visitor, 2007 Mercedes-Benz SL550, 28,000 mi
Leaking fluid and car ABC maintenance went on to stop car and take to mbz repair.
Visitor, 2007 Mercedes-Benz SL550
I have a 2009 SL550 and have just taken it in for this same problem. Glad to have read this report. The Service Dept is keeping my car another day to make sure it has no other leaks.