I came across this older thread and wanted to share my experience:
— I just got a 2018 Kia Soul EV+ and it’s making high frequency pitching noise all the time the vehicle is on.
— While test driving, I was wearing a hat which was covering my ears and couldn’t hear that tinnitus style noise.
— It’s coming from the dashboard area. I played with all the available settings, including the screen brightness, but nothing helped. The high frequency electronic hissing sound is there all the time and is really annoying.
— Dropped it off at the dealer’s, their service department is claiming they can’t hear anything.
— I have driven other EVs for over 5 years before Kia Soul EV. Most recently, Ford Focus Electric. None of them were making high-frequency sounds whatsoever. I have normal hearing, no sensitivity to anything.
Just a thought, maybe your sensations were caused by a similar high-frequency noise but you just couldn’t hear/register it?
I will look into the ways to record the sound and share here.