High pitch whistling noise

So I have this high pitch whistling noise coming from who knows where at 49mph and feathering the throttle . I have taken it to the dealer with no solution to the problem . The truck has 14k miles . Dealer installed plugs in the frame that didn’t do squat . Anyone have this problem and know the solution .the noise is driving me bonkers and I would like to fix it .I am going to take it to another dealer but maybe someone here knows the solution to the problem so I can address it with them . Thanks all

 

Turn the radio up

 

At times it gets so loud I can actually hear it over the radio . So not a solution .

 

Roof rack? Any other exterior mods?

 

Nope no rack no mods all stock .

 

Might be your ac expansion valve. Does it sound like when you run you finger on top of a wine glass? If it is that’s it. Better to just leave it alone. Mine 2017 has been doing it since new and ac been ice cold even on 108’f temps here in SoCal in traffic.

 

I had something like this from a bug shield on the hood. I put electrical tape over drain holes and it solved the problem.

 

Just kidding bro. Good luck tracking it down and finding a solution

 

One of the control arms has an open hole somewhere.

 

High pitched noise, at a specific speed, when feathering throttle...

Rear diff perhaps?

This actually IS a characteristic of the truck lol.

Yeah yeah, I know some trucks don't do it.

 

https://www.tacomaworld.com/threads...oise-howling-when-feathering-throttle.442341/

 

it's wind noise hitting the control arms

 

I had it in my '06 TRD and now in my '21 TRD. I've always suspected it's an electrical harmonic emanating from the speakers. If you're really ambitious, try disconnecting all of the speakers and see if it goes away. While I do think it's annoying, it's never bothered me to the point of doing what I suggest.

 

Sounds like rear diff whine.

 

See if this thread offers some insight.

https://www.tacomaworld.com/threads/whistling-sound-with-acceleration.638873/

 

Does it do it with the AC off?

 

I got this additional to my noise .face palm .

 

Ac on or off doesn’t make a difference.

 

I was thinking that but the dealer plugged those holes I checked .

 

I’ll give it one more try at the dealer see what happens . Thanks for the inputs .pretty annoying having to chase down noises on a almost new truck . I understand it’s a truck but we Tacoma owners shouldn’t have to put up with it . We pay a lot of money for these trucks expect some quality control .