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I just recreantly had the pedestrian speak retrofitted (becuase I wanted too!), but maybe I am crazy, but I turn on the while drivng, it never turns off. isin't it suppose to turn off at 15mph kinda thing? I thought it was for only going slow..
Does seem odd. I have an early 2020 Model Y without a PWS so it's quiet all of the time. Maybe try a reboot? Only should make sound while you are going up to 19 miles per hour.