The noise you are hearing is the SBC pump running it's self test and readying the car for operation. It does this everytime you "wake " it up. You can't hear it outside and it may not run the pump if the car has been idle for a short time. It is a normal function for all cars equipped with the SBC system.
Engine noise when I unlock the doors
own a 05-E320. When I unlock the door I hear the engine make noise for a few seconds. Sounds either electrical or air in suspension? A friend called it "growling", Should I be concerned?
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