NHTSA Complaint #11465658 — 2022 TESLA MODEL Y

This happened on our first and so far only highway drive since purchasing our 2022 Tesla Model Y LR AWD car new last week. I was driving on I-25 southbound in Wyoming north of Cheyenne. Speed limit was 80 mph (and my speed). I was using adaptive cruise control and Autosteer. Partly cloudy day, no traffic, long stretches of straight highway with gently rolling hills. Collision avoidance braking was turned on but at lowest sensitivity setting. There were several instances of phantom braking where speed dropped slightly (5-10 mph) but resumed instantly. These would not have been a problem unless someone had been tailgating me. One time, same conditions, the collision alert (red flashing lights and alarms) was set off and car did a hard braking on its own from 80 to maybe 50 before I took over control. This was very dangerous and could have caused me to be rear ended if a following driver had not been attentive. In all cases I was NOT near an overpass and there was no surrounding traffic in either southbound lane. There is a considerable distance separating the northbound lanes which had little traffic anyway. I was NOT near an overpass and could see no shadows or dips that could explain the problem. It does not appear to necessarily be a problem with the Autosteer system or ACC but rather the collision avoidance system (which uses the same sensors and algorithms, I know).