[johansiew]

Have anyone experience high pitch sound in the car when it is travelling at about 150KMH and above?

 

[Klass]

High pitched sound like maybe a speaker high frequency sound? Could you possibly record a sound clip??

 

[Achilleasc]

Have anyone experience high pitch sound in the car when it is travelling at about 150KMH and above?

Hello, i have same problem with my glc 250d, over 120km a high pitch whistling sound comes up. Did you manage to solve it?