2009 Mercedes-Benz SL550 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2009 Mercedes-Benz SL550

2009 Mercedes-Benz SL550 Problems

Active Body Control System Can Leak Hydraulic Fluid

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.

Evaporator Temperature Sensor Failure

The evaporator temperature sensor can fail, causing the AC compressor not to cycle. If the AC compressor does not turn on, the AC system will not blow cold air. If the compressor is stuck on, the air will be very cold at first, before warming up.

Wear causes noise at vario roof seals on high mileage vehicles
On higher mileage vehicles, wear causes noise at the vario roof seals. Lubricating the seals can usually cure the problem; in most cases, the seals do not need replacement.

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2009 Mercedes-Benz SL550 Questions

Radio shuts off and on repeatedly (2 answers)

Just bought a very clean SL550 with only 10,000 miles. After 4 days the right tail light (not brake light) went out then the radio started turning on and off then on again...every 45 seconds or so. The dealer told me that BOTH keys fobs had dead batteries in them and the new batteries are still o...

When replacing rear tires is it normal to have a rear wheel alignment? (1 answer)

ABC failure on very cold days - anyone else with this issue? (2 answers)

Only on cold days (under 10F) - the ABC will totally fail, dash goes RED, tells me to pull over immediately, squishy ride, etc. Once its above 20F or so it's fine. Happens every winter.

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