F10 Discussion Anything and everything to do with the F10 5 Series. The F10 made it's debut in 2010 as a MY2011.

Efficient Dynamics hum/droning sound

Old 07-06-2017, 12:18 PM
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Join Date: Nov 2009
Location: Austin, TX
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My Ride: 545i sport
Model Year: 2004
Default Efficient Dynamics hum/droning sound

My 2012 550i has developed a closed throttle (ahem valves) humming/droning sound while coasting at all speeds above about 15mph. Trans in neutral, noise stops. Light pressure on throttle pedal, noise stops. So, it seems that the noise occurs while the engine is in "efficient dynamics" mode...eg, charging the battery when coasting.


Has anyone else experienced this issue and am I on the right track? If so, where would one start to diagnose. Everything seems to work properly other than the noise.
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