Quote:
Originally Posted by cantstopthefeeling
Hi guys!
I recently purchased a 2015 535i xDrive. I have a few DIY projects on my hands, but otherwise, the car is in immaculate condition. My biggest gripe is this high pitch sound when the MPG gauge goes up and the blue EfficientDynamics label is illuminated. It's so high that it's noticeable over AC and radio at low to moderate volumes. It's not ear piercing but just loud enough to hear and be annoying. I tried having my dad listen, but his ears must not work well enough anymore! Anyone have any advice?
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Efficient Dynamics (Blue) simply means the alternator is charging at that time.
It sounds like your alternator is making a whine when it charges.
Your solution will likely involve replacing your alternator with a new one.