I took my Z to the dealership. The first thing they wanted to do is to know what I'm talking about so I had the technician sat in my car and listen for the high pitch noise. The technician was not able to hear the high pitch sound, so they had their front desk lady sat in my car, and she said she was able to hear it. I told the dude something like "I read this sound is caused by the ECU, if you call your factory rep or support or something, they should be able to tell you what to do." So the technician called and the other line confirmed the issue and authorized the technician to order me a new ECU. (Upon until this point, my car was not even driven into their shop, the tech did not even open up the hood)
After exactly a week, the ECU came and I brought the car in, the tech installed the new ECU and the high pitch noise is gone.
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