NHTSA Complaint #11580692 — 2023 TESLA MODEL Y

You have no doubt heard the news that Tesla has deployed Full Self Driving to all its vehicles as a "free trial." My Tesla received this update in the past few days. Last night I was driving on an expressway and engaged what has up until now been traffic-aware cruise control by pressing down one time on the right stalk. I expected regular cruise control but the car started steering for me. Tesla has changed the default behavior of the cruise control activation (one single downward press on the stalk) to instead activate Autopilot. My attempt to regain control caused me to jerk the wheel side to side in a way that could have led to an accident had I been in heavier traffic. This was unexpected behavior from the vehicle and I find it unacceptable that Tesla has changed a default function in this manner. I had to hunt around on the screen to find the setting to change the behavior back to regular Traffic Aware Cruise Control from one downward press. Furthermore, on the same 20 mile trip I had three phantom braking incidents while the car was on Traffic Aware Cruise Control mode. This is more than typical and these events can be dangerous if they happen in traffic. Tesla should not be allowed to deploy changes, especially without notice, that modify basic functionality of a car in motion from what the driver has become accustomed to.