Adaptive Cruise Control problems of the 2023 Tesla Model Y - part 1

I believed Tesla full self driving (fsd) was in effect. My Tesla proceeded at 35 miles an hour toward a stop sign and I had to manually stop the vehicle to prevent blowing the sign. It turns out that Tesla sent an email 2 days ago (April 7 2026) that notified me that fsd had been cancelled because my credit card was declined (I had to replace a card on April 7 due to a lost card). I did not see this email. There was no notification in the vehicle that fsd had been deactivated. When I thought I was engaging fsd, I was in fact engaging an autosteer mode with much lesser capabilities, essentially only acting like adaptive cruise control and lane guidance. Engaging this lesser mode is done in exactly the same fashion as fsd, and any driver using it in my situation would always assume fsd was active. This problem, if not corrected will absolutely cause accidents and potentially fatalities. Tesla needs to inform the driver via the head unit that fsd is not active in an obvious, unmistakeable way.

This is my 10th report; it relates to 2 issues I have reported before 1. The "phantom breaking" on cruise control that I have reported a few times previously has apparently been fixed on a software update, but we were not notified. I went in to santa fe Tesla where I took delivery of my vehicle and got into a discussion about my disappointments with this car, specifically the tires (see #2). I mentioned my past problems, including the phantom breaking. The man was dismissive and a bit defensive and asked if I'd made an appointment. I said I'd been told several times they hadn't figured out a software fix (and even Tesla employees were simply refraining from using cruise control, which is what I did). He said they "fixed it a while ago" and he's not had complaints since then. I tried cruise control on my 45 minute freeway drive and indeed, the problem did not occur. Interesting that they knew it was an ongoing problem, didn't deal with it, and didn't announce when they finally did fix it. I do not yet know if it is an ongoing safety problem for me but I'm planning to gradually increase my use of cruise control, since most of my driving is high-speed freeway driving. 2. I asked about getting warranty rebate for my original tires that have failed at 38k miles. He said I would have to pursue that through the distributor (american tire?) and that he'd only had 2-3 customers ever do that. He said most customers just pay for better tires. He offered to sell me another continental tire in the $400 range and implied that I could find tires through a tire store. I went to discount tire who can get me a rebate on only 1 of the 4 tires because it's down to 4/32" tread. The other 3 can't be warrantied until they reach 4/32". . . And I've already hydroplaned/slid on the freeway in a sleet storm with wet roads. The company knowingly provides inadequate tires and does not stand behind them. This is an unacceptable safety risk and a moral outrage.

The vehicle has a phantom breaking problem. It does that 3 times daily on the same route in the same place. This is a big safety flag. It has the same problem on the autopilot & normal cruise control.

I was driving with the car in autopilot in the center lane of the highway. I could see a white vehicle move close on my right, and I confirmed that it had crossed over into my lane with both its front and back left wheels on my Tesla screen with a quick glance. I then tried to maneuver to the left lane (which my screen showed was clear) but the steering wheel had significant tension. All of a sudden, I heard the chime signaling that autopilot disengaged, the car jerked hard, and my car was headed toward the median. I swerved quickly to the right and hydroplaned. As I straightened out, my vehicle hit a vehicle in the right hand lane. The strong tension followed by jerk and quick release of tension prevented me from having full control of my vehicle. I believe that if autopilot had not been engaged, I could have safely moved into the left lane with control. The police arrived but I was very shaken up and simply said I swerved to avoid a car in my lane but in retrospect wish that I had gone into detail. I’d also like to note that I have a clean driving record, was not in a hurry, did not have loud music on, had both hands on the wheel at 10 and 2 o’clock, and was focused on the road.

Currently on the newest Tesla full self driving software v14. 1. 4, it is phantom breaking as well as phantom swearing out of nowhere. It is swerving and using the breaks so hard it actually affects the steering wheel and self disengages it's self (without the big-loud safety alert to immediately take over control), it just does the soft disengage audio notification, like if you wanted to cancel fsd yourself. The serious problem is that the car does not stop like it should, instead it just continues it seems like it just neutrally rolls on its own drive and twice in the last week it would swerve directly into oncoming traffic. It is not supposed to be doing this at all, especially now that the "hands off" approval is enacted. I drive about 450 miles a week and this has happened about twice a week for the last two weeks. Thank god I was paying attention all four times, but I am so worried this is going to kill someone. I have tried to call Tesla but they purposely don't staff their phones and no one answers.

The full self driving (supervised) adas in this vehicle will react to shadows on the road and can put the car or other cars at risk. We have had multiple instances where, on a sunny day, the car will react to shadows cast on the road and take evasive action like braking or switching lanes abruptly. This can be hazardous due to the random nature of the of the occurrences and them happening at times when a driver may be lulled into a false sense that the car seems to be driving itself well. So far we have been lucky that no other vehicles were traveling too close behind or to the side of us. We have experienced this behavior multiple times and there are other people online who have reported this. The car gave no warning indicators either before, during, or after the occurrence. Note that our car uses a hardware 3 computer. I believe that this issue may have been fixed on newer Tesla cars that use hardware 4.

When using the adaptive cruise control or “autopilot” feature on my Model Y, the vehicle will brake extremely hard without warning. This sudden, unnecessary braking is commonly referred to as phantom braking. The failure is available for inspection upon request. This malfunction poses a significant safety risk to myself and others, especially vehicles following behind, as it could lead to rear-end collisions. The issue is widespread, with many other drivers experiencing the same problem. The problem is easily reproducible on highways, particularly at certain intersections where no obstacle is present. The system will sometimes display a “curvature assist” prompt despite the road being straight, causing the vehicle to brake abruptly. I have not taken the vehicle to a dealer because the warranty has expired. The issue has not been confirmed by a dealer or independent service center, nor has it been inspected by the manufacturer, police, or insurance representatives. However, I reported it directly to Tesla and have received no response. No warning lamps or error messages appear before the failure, aside from the inaccurate “curvature assist” prompt. Cause: unknown.

The forward-facing camera system, automatic emergency braking (aeb), and autopilot/cruise control have repeatedly failed on a 2023 Tesla Model Y with approximately 22,000 miles. The aeb system becomes unavailable and the autopilot disengages without warning, including at highway speeds of 70 mph and city speeds of 30 mph. The active safety systems are functional less than 10% of the time. The sudden, unexpected loss of active safety systems at speed presents a serious risk of accident and injury. The problem has been reproduced and confirmed by an authorized Tesla service center on three separate occasions. Repairs attempted include replacement of the triple forward-facing camera assembly (twice) and replacement of the car computer (hw3) with a firmware update. Despite these repairs, the defect recurred within days of each service visit. A fourth service appointment is now scheduled for the same issue. Warning alerts appeared on the vehicle display prior to each failure, specifically "camera blocked" and "automatic emergency braking unavailable. " these alerts were first detected in August 2025 and have recurred through January 2026. All three repair attempts were covered under the manufacturer's basic vehicle limited warranty, confirming acknowledgment of a manufacturing defect. The vehicle and components have been inspected by the manufacturer's authorized service technicians. The vehicle is available for inspection upon request.

While driving a Tesla Model Y on a freeway in arkansas, the vehicle was operating in autopilot mode (Tesla's driver-assistance system). During a highway merge, the vehicle followed a state trooper's car too closely and failed to slow down appropriately. The trooper had to apply his brakes to avoid a collision. After stopping the vehicle, the trooper issued a written warning, explicitly attributing the issue to equipment failure and advising immediate correction. This issue appears to involve a failure of the adaptive cruise control and forward collision detection system while autopilot was engaged. No collision occurred, but the situation posed a clear safety risk to both the trooper and my vehicle. This was not the first issue with the vehicle's automation. In a previous incident (November 2024), the vehicle exceeded the posted speed limit while on autopilot, resulting in a traffic citation. Tesla has been notified, and a service request is open. Diagnostic review is pending. There were no warning lights or alerts from the vehicle before the incident. The vehicle remains available for further inspection if required.

I am writing to raise a safety concern regarding the use of Tesla’s full self-driving (fsd) system on my 2023 Tesla Model Y when a rear hitch-mounted bike rack is installed. Numerous users, including myself, have experienced dangerous or erratic behavior from fsd when carrying bicycles on a rear-mounted rack. Specific issues include: false detection of a trailing vehicle directly behind the car. Phantom braking or swerving, including abrupt lane changes or acceleration. Unreliable navigation at intersections (e. G. , nearly running stop signs) due to apparent misinterpretation of sensor data. In some cases, tailgating or aggressive following behavior by the vehicle. These behaviors appear to stem from the fsd system misinterpreting the presence or visual signature of the rack and bikes as another vehicle. In several online reports, this has led to unsafe maneuvers. To temporarily mitigate the issue, some drivers have resorted to taping over the rear camera, which is neither safe nor user-friendly. While I recognize Tesla has made improvements such as camera obstruction warnings (e. G. , in fsd v12. 5. 6+), these do not address the core misclassification problem. My requests: that Tesla officially acknowledge and investigate fsd misbehavior in the presence of rear-mounted bike racks. That Tesla provide clear driver guidance on whether fsd should be used when such a rack is installed. That the fsd system include an option for a “bike rack mode” or alternative logic to prevent rear-camera misinterpretation. That this concern be escalated within your safety and ai development teams to ensure user safety is prioritized.

The issue lies with Tesla’s full self-driving (supervised) system 12. 6. 4 on hw3. While driving on roads with lower speed limits (such as 35 or 45 mph), the vehicle occasionally brakes abruptly for no apparent reason, even when there are no vehicles or obstacles ahead. This unexpected braking behavior can be dangerous, as it may lead to rear-end collisions if the driver behind is not attentive or prepared to stop suddenly.

This started at about 65000 miles in my 2023 Model Y. The rear camera first lost picture and I received a warning that it may be intermittent. It has progressed now to the point that autopilot, navigation, all cameras, cruise control, auto headlight, and auto wipers are all nonfunctional. The car does not know its location. All safety features such as lanekeeping, cross traffic alert, auto braking are disabled. The rearview camera no longer functions. Software updates no longer complete downloading. While there are numerous reports of computer short circuits in hardware 4 cars, the only solution I am offered is to have the computer replaced at my own cost of just under 3000 dollars. And that would be warranted only for one year or 12500 miles. Reviewing the submissions on the NHTSA website as well as searching online, this problem is not infrequent. I do not feel safe letting my wife or daughter drive the car. Certain 2024 and 2025 models with this problem have been recalled for new computers. This must be expanded to include 2023 models as well.

This is my 7th report. On [xxx] [xxx] pm I was traveling home from alburquerque and was just past isleta resort and casino heading south on [xxx]. I don't use cruise control very often because of the emergency braking that occurs (and that I have reported several times before). I was on a long drive and decided to try it on a short section of [xxx] on my first day, and found that it was slowing on it's own when I approached a car from behind. Two days later on the way home, when there was no one in front of me, it slowed significantly without needing to and I thought it was better than the past rapid braking. . . As I was thinking about this, the car abruptly "slammed on the brakes". I was forced forward but had my seat belt on. Stuff fell off back seat onto the floor. The igloo cooler on the front passenger floor toppled forward. I'm quite sure there would have been a accident had someone been behind me. Additionally, the car is not recording my tire rotation from 16,000 miles, and continually says the last tire rotation was at 8,000. Good thing discount tire keeps track, as I am now overdue for another rotation (25k+ miles). Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6.

Adaptive cruise control changes speed without warning, often when passing a truck clearly in another lane, but also for no apparent reason. This occurs an average of approximately once every 5 miles, but at irregular intervals. It slows quickly enough to be a hazard. This occurs in all modes (set by speed limit or manual).

This incident happened on [xxx], I just got the Tesla data and police report. Here are the events as I remembered: - I was driving my 2023 Tesla y with fsd supervised (v13. 2. 8) along [xxx] entered from [xxx] and driving close to north of [xxx] without any issue - noticed a car in front of me braking hard (about 6secs from the recording dashcam footage) - realized fsd was not braking hard enough (or at least it did not feel like it) - slammed on the brake for what felt like an eternity (about 2 secs from the dashcam footage) - rear end collision on the front car at ~25 mph, airbag deployed. I remembered feeling the brake pedal vibrating but did not stop the car at all. By analyzing the raw data provided by Tesla, it is found brake, accelerator, aeb, abs and tsc were completely messed up after fsd failed, please refer to the attached analysis report. Note: the dashcam video file and the original Tesla data are available for reviewing if any need as I cannot upload along with this report. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

This is my 6th complaint about Tesla. I wrote recently when my remote drivers could not unlock my car. I solved it myself and when I got home, I called roadside service for help re-programing the key card that failed. The person told me to call Tesla on Monday about the inability of my other drivers to unlock my car. I did that yesterday, and I told him I thought it was something wrong with my car, and suspected I needed to take it in for service. He said no, it wasn't the car but that I needed premium connectivity ($10/mo) in order for my drivers to be able to unlock my car. He put me on hold and came back to tell me that "it's a safety thing" so that no one can remotely unlock my car. The reason I put 2 friends in other states on my profile was for them to be able to help me, as a single woman who lives alone and takes camping trips alone. That is not a possibility. Furthermore, I asked him about the sudden braking on cruise control and he'd never heard of it. He uses the auto drive, that they don't call auto drive anymore. . . Presumably because of the safety issues. I think this car needs to be recalled like the trucks were. They are not safe and Tesla doesn't care. By the way, the car has 5g, but I cannot stream my music or listen to podcasts, to which I'm already subscribed, without paying for premium connectivity. What a scam.

This is my 5th complaint and involves, again, the key card. This is the used key card the el paso Tesla dealer was kind enough to give me, and help me program, when one of the original key cards, less than a year old, stopped working. (Tesla wanted me to pay $45 for 2 new key cards) the used key card stopped functioning so I planned to call Tesla and have them "reprogram it". . . Something that must be done while I am in the car. I went on a last-minute trip and took my spare, barely-used key card. I also had my phone but didn't realize I'd not re-downloaded the Tesla app when I recently troubleshot my phone. Later in the day I parked at city of rocks state park in nm, still without connectivity, and locked the car with the "good" key card. Then I misplaced the key card! I called one of my 2 backup drivers and asked her to unlock and start my car for me. Her app did not allow her to do so, even though it showed the location of my car at city of rocks. . . It said "move closer to the car". (she lives in CA). I had to get a ride to wifi, download the Tesla app, and when I tried using it to unlock the car, it said "you must be closer to the car". When I got to the car, I was able to unlock and start it using the phone key. After arriving home, I used my app to get roadside assistance and asked for a phone call when they texted to confirm my location. I explained that I didn't need service, just needed help re-programing my defective card. (I had since found the good card!) the woman on the other end was helpful but it was difficult for her also. We ended up removing the defective key from my profile, though it required a lot of work and also required the "good" key card. I have to call Tesla on Monday (it was Sunday) to get the card re-programmed. Had my difficulty been in a high-traffic or unsafe area I would have been in trouble. The "backup" drivers on my app are there for emergency access to my car, supposedly from any location.

This is my 4th safety report about the same issue: unexpected braking while on cruise control. Since my last report, Tesla offered another free month of auto pilot but I did not take it for fear of this braking issue. On Tuesday [xxx] I was returning to my home in las cruces nm from colorado. I was on [xxx] toward albuquerque, and there was very little traffic. I decided to see if I could get away with the cruise control. As I was pulling into bernalillo, there were some oncoming cars in a left-turn lane at a signal, and my car braked automatically. . . Enough to lurch me forward. I decided to stop at the "new" Tesla dealer in bernalillo (I got my car in santa fe) and ask about the automatic breaking and whether they'd fixed it. The 2 service employees looked at each other and one said "no". I then asked about whether I needed to re-boot my key card since my screen went blank while I was in CO, during a snow storm, parked. I luckily had my phone and on the Tesla app, under roadside service, it gave me the option to re-boot the screen! I did so. The serviceman said he didn't think the blank screen had anything to do with my key card, but I could re-boot it if I want to. (a prior complaint also reported the failed key card in less than a year and Tesla's unwillingness to replace it). Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The incident occurred while the vehicle was being operated with Tesla driver-assistance features enabled, including lane assist and cruise control. The driver experienced unexpected vehicle behavior that felt inconsistent with normal steering response. Although the driver maintained hands on the steering wheel, the vehicle appeared to react in a manner that was not anticipated, contributing to loss of control and a collision resulting in total vehicle loss. No bodily injury occurred. After the incident, the insurer assigned fault to the driver but declined to investigate any potential vehicle system or software-related issues, directing us to the manufacturer. When attempting to report a potential malfunction to Tesla, the manufacturer declined to open a report because the totaled vehicle had been removed from the Tesla app, preventing further system or telemetry review. This report is submitted to document the incident and the lack of access to any system-level review following the loss.

While using cruise control (tacc) or fsd, the vehicle inadvertently brakes until vehicle stops, due to detecting light glare or other things as a collision threat. This happened many times. Reported to Tesla service, they said it is a bug and I should file a bug report. I have previously filed many bug reports about this but no software update fixed the problem. Incident happened many times, Tesla should have records of all, because when there is a disengagement, driver is asked to tell what happened by voice.

Accident report [xxx] I was driving on [xxx] fort smith ar to bentonville car was on autopilot, it was raining on and off and with all other cars we were driving around 70-80 mph all the sudden it started a short slip on the right then second after that it started spinning and took us out of the road car totaled car. I believe problem is autopilot did not disengage when car started to slip but instead it was still on until the car got out of the road and hit a large tree. This is 3rd time for me to have this type of accident with same situation slip then spin then out of the road. I believe autopilot is the problem here 100%. This autopilot system is very dangerous. I had enough of this and im hoping national highway traffic system will step in. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Harsh braking while using cruise control. Known as "phantom braking". This is causing extremely dangerous situations. The vehicle slams on the brakes while at high speeds for no apparent reason. Perfect weather and road identification markers. Happens with oncoming vehicles in normal path of travel as well as when there is a break in painted lines on the roadway. This creates a serious potential for an accident injury or death. Happens consistently.

Tesla Model Y 2023 running on enhanced autopilot (software up to date as of Nov. 19, 2024) on a highway in the rush hour when traffic is moving at the speed of 5 - 30 mph, failed to identify the trailer in the front and sped up. I had to take over control, apply brakes to avoid the rear-ending the trailer in front of me. Tesla was speeding up as if the road was open. In the computer display it does not show any traffic in front of the car. The trailer did not have any reflectors in the backside, but had working tail lights that would light up only when the trailer applied brakes. In the attached picture, blue Tesla is my car. There were no warnings of any kind of malfunctioning in my car. Highway safety can probably improve regulations on making the trailers more visible. Tesla should improve its image recognition software. Not being able to recognize a dark trailer from the dark asphalt road is a dangerous situation for Tesla cars running on autopilot.

Tesla fsd v12. 5. 4. 1 tried to run a red light without stopping. Although fsd has a multitude of other issues when it comes to breaking traffic laws running red lights shouldn't be one of them. Luckily I was able to override the system and no one was in the area to get hurt and no property damage.

New version of autopilot software install is very unsafe. It aborts multiple times. It also accelerates when it should be stopping or slowing to make a turn.

We have had numerous incidents of sudden and unexpected braking. Earlier this month while rounding a curve with adaptive cruise control enabled, the car aggressively braked when it saw an oncoming semi safely in the other lane. It was good there were no cars behind us or no doubt they would’ve rear-ended us. Last night - like so many other times the past year or so - I was pulling into a parking spot with a bush in front and, only a few feet in, the car slammed the brakes on even engaging abs. Usually the warning system just makes a sound or gently applies this brakes but this was jarring. Everyone in the car lurched forward. The date below is from the incident related to the semi. That could have been very bad. My Subaru outback uses sonar and I’ve never had these sorts of problems.

Date of incident 9/9/24 11:15 am 2023 Tesla Model Y traveling north bound I-15 using Tesla autopilot intending soon to exit pioneer crossing / american fork ut in the far right lane — vehicle made sudden move to right glancing off wall causing scraping damage to right front quarter panel, and hub cap. Although I stepped on the brake in attempt to take control of the vehicle I immediately experienced uncontrolled acceleration and difficulting in steering. I chose not to exit and fought to keep the vehicle in varying freeway lanes attempting to brake to which the vehicle continued to attempt to accelerate against the braking, I also simultaneously and frantically continued to push the right stalk upwards in attempt to disengage autopilot assuming that was causing the unintended acceleration. I was fighting to keep the car in a lane with faulty steering at time awakwardly steering to avoid slower moving vehicles. I eventually ended up coming to a complete stop in the middle lane of I-15 north bound 9/10ths (nine tenths) of mile north of my intended exit (mile post #278 pioneer crossing). Because of faulty controls I was afraid to try to move the vehicle to the side — I immediately put on emergency flashing lights and called 911 on my cell phone. While nervously waiting for emergency services approaching vehicles slowed and made their way around me — per instruction I stayed in my vehicle with seatbelt on. One large pickup truck struck my vehicle driverside rear as he passed by and failed to stop. Utah highway patrol and fire department ambulance arrived within approximatley ten minutes. Two highway patrol officers stopped traffic and assisted in me slowing driving my vehicle to the center emergency lane. One office stayed with me until tow. He commented the right rear wheel appeared not aligned correctly suggested the rear axle was possibly broken. I was not injured beyond being extremely frightened. No passengers.

Driving using adaptive cruise control on [xxx] in nebraska. Sunny, dry day, no cars or trucks around us. Speed approx 80. Vehicle unexpectedly brakes very hard. Was able to recover by accelerating but very dangerous if there had been a vehicle following behind us. Car has done this many times since purchased. Will avoid using cruise control. It is not safe! information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Several times in the last few months I have had extremely hard braking on the highway when using adaptive cruise control (called autopilot by Tesla). It has happened on a few different highways ([xxx] in arizona, [xxx] in new mexico, [xxx] in colorado) all when going between 65-75 miles per hour. Thankfully, in most cases, there was no one directly behind me or there almost certainly would have been an accident. In one case a colleague of mine was following me and had to slam on the brakes, too, but she avoided an accident by reacting quickly. In all cases the road in front of me was empty of traffic and there was no warning that the brakes were about to be strongly applied. In some cases the car seemed to react to a turn in the highway, or maybe an uphill or downhill section, but it is unclear to me. In all cases the brakes were applied with a lot of force, and in all cases it was pretty scary. This seems like a huge safety issue with the adaptive cruise control of my Tesla Model Y. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Driving north on [xxx] just north of red ond oregon on a 2 lane section at sunrise with traffic aware cruise control set the Tesla braked aggressively when a semi approached in the oncoming lane. Neither vehicle crossed the center line but the crash alarm blared and the car braked almost causing a rear ending accident. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Full self driving version 12. 5. 1. 3 has run through red lights on two occasions in past three weeks. This is completely unacceptable and software must be recalled. Suggest that Tesla should be reimbursing customers subscription fees paid.

Adaptive cruise control frequently rapidly decelerates (phantom braking). This can occur on empty roads in excellent weather conditions, but happens every time I have used the cruise control. The rapidity of the deceleration creates a significant risk of being rear ended. I have stopped using cruise control as it is too dangerous. This has been a noted problem on multiple Tesla models for multiple years. So far Tesla or NHTSA has not addressed the problem.

I was fully stopped at red light of intersection of [xxx] . Suddenly my vehicle accelerate it self and start auto drive at high speed and malfunction, hitting multiple parked vehicles. My vehicle was on auto holding brake feature. I was not able to control my vehicle, even when I tried pressing the brake. No warnings or alarms from my vehicle when crashes into multiple parked cars. On [xxx] incident happened. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

While driving straight on a 2 lane divided highway, the traffic assisted cruise control decided it needed to slow itself down significantly to 15 mph under the speed limit (posted speed limit was 65 mph). There were no vehicles in front, behind, or beside my vehicle. The breaking occurred when it came across a line break where cars from the opposite side of track could turn left onto a service highway but no one was in that divide nor in the turn lane. There was no warning or any obvious indication that the vehicle should harshly slow down for any safety reason, where in fact is there was a vehicle behind me, it could cause a crash. I made a request for Tesla to repair the vehicle, but in my attached photos, you can see that they admit to the issue being software related and insisting that it is an unrepairable problem until a software update can be issued.

We were on the freeway with cruise control on and the car slammed on the brakes. It automatically slowed 15mph while in front of another vehicle. The cause was that it hallucinated a person in the lane of the road, I could see the "person" on the screen of my car. However there was no person or hazard in the way.