Car Problem Reports

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

Mercedes-Benz SL550 Problem
13 Reports
Me Too

Model Years Affected: 2007, 2008, 2009

Average Mileage: 38,070 mi (13,000 mi - 67,000 mi)


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

  • Visitor, , 20,000 mi

    trunk assist failed

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  •  Rookie

    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.

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  • Visitor, , 23,000 mi

    trunk soft close not working due to pneumatic system leak,--not repaired as new unit will cost over 500

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  • Visitor, , 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

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  • Visitor, , 67,000 mi

    Trunk will not close fully, causes light on trunk assist to remain on, alarm on dash and locks not working properly.

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  • Visitor, , 28,000 mi

    New trunk latch for 817.00

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  • Visitor, , 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!

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  • Visitor, , 30,000 mi

    pneumatic leak with battery drain

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