NHTSA complaint #11455424

Owner complaint summary

While driving with the adaptive cruise control enabled or the autopilot enabled, the car will do a hard braking episode which may reduce the speed from 60mph to 40 mph about a fast as is possible without locking up the tires. This happens on four lane divided interstate driving as well as two lane undivided driving. In either type of driving, there may not be any traffic anywhere in site. The most common condition for the occurrence of the braking is while using the adaptive cruise control on a two lane highway and a large truck or farm vehicle approaches from the other direction while driving in the center of their lane. The car acts like it has detected a possible collision, annunciates the collision warning, and brakes hard. I am reporting this because it is obvious to me that this is a safety defect. If someone were following behind me, even at a range considered safe, the deceleration is fast enough to cause the car behind me to collide with me. These hard braking episodes will happen as many as 4 or 5 times in a full day of highway driving. Many smaller episodes of less dangerous braking occur throughout a full day of driving and I consider them annoyances. I received my new car in January of 2022 and have driven it 4300 miles. The car has exhibited this condition since the fist time I tried to use these features starting February 3, 2022. I will not use the cruise control or autopilot when passengers are in the car because it is very alarming to them when it happens. I now rarely use autopilot when I am alone because of the constant state of fear that an uncontrolled braking will happen which would cause an accident. I would be happy to share further information with you. I am aware of the investigation that you began last week looking into the phantom braking phenomenon for Tesla owners. From reading the Washington Post article on the subject and then various posts on Tesla forums, my experiences match the phantom braking descriptions.