Airmatic Pump Motor May Fail Due to Sticking Relay on Mercedes-Benz E550

The relay which turns the airmatic suspension pump on may fail causing the pump to run continuously. This can result in failure of the pump motor or a dead battery as the pump motor will continue to run after the car is turned off. Also, Worn airmatic pump mount bushings can causes noises in the front axle while driving on bumpy roads or a buzzing noise while the pump is running.

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Average mileage: 43,666 (37,000–53,000)
4 model years affected: 2007, 2008, 2009, 2010 more
7 people reported this problem
3 people shared problem details
Airmatic driver side failed, pump won't turn off, front end lopsided and driver side sitting on tires.
Airmatic pump failed and was NOT covered by warranty. Also, left the suspension selector in Sport mode while the car was parked in the garage for 3 weeks which required the battery to be replaced at 28,000 miles. The MB repair service acknowledged the issue.
The Airmatic Pump Motor was running continuously and had to be replaced due to damage. Fortunately, it was still under warranty.
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