High pitched electronic/dentist drill sound when accelerating.

any part driven by the drive belt can do this

jack vehicle up and rotate one wheel at a time to see if noise is present, let me know what you find

My S40 T5 makes a whirring sound due to the turbo but.... I did have an issue with the right front hub bearing. Lots of road noise while driving and it got louder as I accelerated. $215 dollars for the part.

I had that sound in my Acura. The transmission was low on oil.
Hope this helps.

Brake pads and/or wheel bearings.
Fix them NOW or it's going to cost you 10 times more later

worn belt, or the cv axels. drive in a tight circle each direction and listen for for a clicking sound. if you hear one then your cv axels need to be replaced

I assume that you have a 6cyl engine, noise came from both worned secondary timing chain tenssioner shoes, just replace those two and while you have them all apart, also replace main tenssioner and guide, then all noises will go away. Good luck!

I know this original question was written quite a few months back but I was wondering if you ever found out what the high pitch sound was. I just purchased a used 2005 Honda Odyssey and it is doing the exact same thing. Any advice?

It's probably the turbo you're hearing. They spin very fast and make a noise like that. Ever hear an 18-wheeler go by you and accelerate and they make that high-pitched whistle? That's the turbo spooling up. Now, if it sounds like a dentist's drill, that's usually a sign that the turbo is failing, but I'd bet that since your car is under four years old, as long as you've kept up on the maintenance, it's the normal turbo spool.

If you have a supercharger it might be that, it is a natural sound, enjoy it