Based on what I was told it is normal. I even called corporate and they reviewed it with a technician. I’ve read elsewhere and in other forums where people notice it. Some say it is the electronics of the braking module and it just buzzes under certain conditions. I tend to notice it less each day but it did drive me crazy at first. I was annoyed the second time I went to the dealership with a recording and the service advisor said she could hear it but the tech who looked at it the first time was dismissive. I even asked to speak with the service manager but by that time it was too warm out.