Pneumatic System Leaks May Cause Problems With Seats, Trunk, and Doors on Mercedes-Benz SL550

Leaks in the pneumatic system will cause problems with the dynamic seats and the trunk and/or door closing assist.

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Average mileage: 40,063 (13,000–67,000)
3 model years affected: 2007, 2008, 2009
15 people reported this problem
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Viewing 1 - 9 of 9 problem details
I have the same problem. Intermittent door lock problem -- now not working at all, trunk soft close no longer works, roof won't go down. Battery drain problems on and off for past year. I think I have a pneumatic leak causing the PSE pump to run and drain battery, and now the PSE pump motor has burned out (fuse reset no longer resets pump). :( Need to find leak, repair and also repair PSE.
2008 Mercedes-Benz SL550 23,000 mi,
trunk soft close not working due to pneumatic system leak,--not repaired as new unit will cost over 500
2008 Mercedes-Benz SL550 20,000 mi,
trunk assist failed
2008 Mercedes-Benz SL550 60,000 mi,
Trunk leaks . . . PSE pump fails . . . battery drains . . . No recall???
2008 Mercedes-Benz SL550 42,500 mi,
Trunk actuator failure..... $245 part online made of stainless steel to replace plastic part Will go in in a day or two.... Hope it will fix .... Alert of non closing trunk
2008 Mercedes-Benz SL550 67,000 mi,
Trunk will not close fully, causes light on trunk assist to remain on, alarm on dash and locks not working properly.
2008 Mercedes-Benz SL550 28,000 mi,
New trunk latch for 817.00
2008 Mercedes-Benz SL550 13,000 mi,
Trunk lid would not completely close and lock thus not allowing the top to retract. The door locks worked intermittently. $3400 for mercedes to repair!
2007 Mercedes-Benz SL550 30,000 mi,
pneumatic leak with battery drain