Buzzing noise through speakers happening at start up

[ptondera]

At least once a month I will start my 2023 Bronco Sport Heritage Limited and I hear a couple short buzzes through my speakers and then it goes to a solid, very loud buzz. The only way to get the buzzing to stop is if I turn off the car, close and lock the doors for 30 seconds and unlock the car.

My dealer has had my truck for a week now and cannot duplicate the problem. Despite sharing the attached video with them, they keep telling me it had something to do with a software upgrade to the ACM (Audio Control Module).

What's not in the video, when I turned the car off and on again, the sound persists.


Anyone experience this? Any suggestions?

 

[Gents]

Wow. I have a buzzy passenger side speaker cone that my dealer insists he doesn't hear. That Buzz? That's a lot worse.

 

[Glamdring70]

Last buzz I had in a vehicle was a loose/fraying wire causing electrical interference is the sound system. No idea if a modern car is susceptible in the same way. If they think it is a software issue, why don't they update the software and "solve" it then?

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