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.
Airmatic Pump Motor May Fail Due to Sticking Relay on Mercedes-Benz E55 AMG
Average mileage: 111,500 (111,500–111,500)
5 people reported this problem
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2004 Mercedes-Benz E55 AMG 111,500 mi, Visitor
The airmatic pump will not stop running after the car shuts off