Adaptive Cruise Control problems of the 2026 Tesla Model Y - part 2

Update to odi 11678614. This problem applies to non-fsd (full self driving) Tesla Model Y cars. Tesla's manual describes autopilot as traffic aware cruise control - it's the first step on non-fsd cars. The second step on non-fsd cars, autosteer, is active lane keeping. In older ys, the first stalk pull engages autopilot, second pull engages autosteer. 2026 juniper doesn't have a stalk - a single scroll wheel press engages both. I read the 300 page juniper 2026 Model Y manual before driving it for the first time. On page 108, it lists 7 things that will cause autopilot to disengage. I presumed that comprehensive list was complete. Unable to attach. Having *autopilot* disengage when turning the wheel in *autosteer* is not listed. During my 59k miles on my 2021 model y, I used autosteer for at least 20k miles. Turning the wheel in autosteer did * disengage autopilot. In my first emergency situation in the 2026 juniper Model Y, turning the wheel * disengage autopilot, and the regen properly kicked in for the disengagement. This action came very close to causing a serious accident. My objections are 1) the action of *autopilot* (disengage / remain engaged) when the wheel is turned in *autosteer* is not documented, and 2) it's different between the old and new ys using the same current software. I understand there were problems with autopilot remaining engaged, and perhaps the change was a good idea; that's an entirely different discussion. Make the action consistent and document it and I'm happy. Summary: in heavy traffic, while on autopilot / autosteer (cruise + active lane keeping), the car beside me suddenly tried to pull into my lane. I made an emergency lane change by turning the wheel, but the cruise also disengaged, (contrary to operation in the prior model) and went to maxiumum regen braking, causing the car behind me in the new lane to nearly rear-end me. Punching the accelerator during the surprising braking avoided the collision.

I've driven my old 2021 Tesla Model Y for 4 years / 59k miles. Four days ago, I got a new 2026 Tesla Model Y. The new y has made a change to the interaction of the cruise control and automatic lane keeping. In the old one, first cruise was enabled, then lane keeping. If you disengaged lane keeping by overriding the steering wheel, cruise control was maintained. In the new y, a single selection enables both cruise and lane keeping. The safety issue is that overriding lane keeping by turning the steering wheel disengages both features at once - the old method kept cruise control enabled. I was driving in heavy traffic today on a 6 lane interstate with cruise and lane keeping enabled. The car next to me abruptly swerved into my lane, causing me to make an emergency lane change to avoid a collision. When I overrode the lane keeping to avoid the other car by turning the steering wheel, my cruise control also disengaged (unlike the old system), which caused maximum regenerative braking to kick in, abruptly slowing me in the new lane. I had to punch the accelerator to avoid being rear-ended in the new lane. This change in lane-keeping / cruise control applies to all new 2025/2026 Model Ys - the "juniper" model update. This change, according to reddit and facebook forums, seems to be universally hated and many other drivers have raised the same safety concerns. I agree with them, but didn't make a report until now because I had not yet experienced an issue where this almost contributed to a high-speed crash. Thank you.

While driving along a few roads using traffic aware cruise control (tacc) or autopilot (ap), the car will suddenly brake for no reason at all. Speeds reduced from 75 to 50 in 2 seconds. Had there been a car close behind me, we may have collided. I am able to reproduce this on several other roads as well. I have not yet reported this to the manufacturer, but a review of internet forums shows this to be a relatively common occurrence among owners. They refer to this as phantom braking.

The incident occurred on [xxx] around [xxx] (from the dashcam footages) in a highway (don't know the place, but I have a police report). I was driving my Tesla Model Y 2026 with full self-driving (fsd v13. 2. 8) beta engaged when the vehicle suddenly off the road and hit the fence on shoulder. I retrieved dashcam footage from the incident, including footage leading up to and during the accident. The fsd system malfunctioned, the car is in a body shop and is available for inspection upon request if done quickly; huge risk to myself and others because no way know when the fsd failed; from this link, same issue: [xxx] the vehicle has not inspected by others no any warnings, the fsd had been working properly in the firt 300 miles trip; but all of sudden, swerved to the roadside with full speed. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).