2009 Mercedes-Benz SL550 Repair and Maintenance

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

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2009 Mercedes-Benz SL550 Problems

Poor AC performance Due to 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.

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.

Check Engine Light Due to Faulty Camshaft Adjuster Solenoid

The camshaft adjuster solenoid (which is related to the variable valve timing system) may fail or timing chain/balance shaft components may wear, resulting in illumination of the Check Engine Light and various drivability issues. Mercedes-Benz has released a service bulletin outlining specific repair instructions depending on fault codes stored.

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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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