While in cruise control, which is adaptive, vehicle will abruptly slow down for no know reason. Usually there are no other vehicles, no highway obstructions, nothing that I can see. Tesla finally told me that this is a "known issue", after making a service appointment, and them calling me to cancel the appointment.
2021 Tesla Model Y acceleration complaints
Page 4 of 7: complaints 71 to 100 of 163, newest first, as owners wrote them.
Car regularly brakes for no reason causing near accidents constantly and posing a huge safety risk. Additionally, the full self driving option is totally unusable. Both these issues have been reported to Tesla multiple times. We have been told the only way we can have an actual working cruise control is to disable the full set aware driving without refund for that Bert expensive option
The driver infotainment system locks up randomly. Which makes all safety features, turn signal indicators, backup camera, reverse mode (mirrors drop), speedometer, collision sensors, etc NON-FUNCTIONAL. Until either the system crashes or finally unfreezes. This also removes one-pedal driving as well when frozen. Version is 2022.16.3
The vehicle was on cruise control (NOT auto-pilot). Driving on Freeway approximately 82 mph when the vehicle slowed to 60 mph instantly numerous time within my 160 mile drive. There were no vehicles in front or beside me. There were no obstacles in the roadway or on the side of the road. Sunny day with no clouds. There were no warnings lamps or messages that would indicate the car was going to brake. My safety was put at risk if there was another driver behind me, I could have been rear-ended. It Could also had been very dangerous if there was adverse weather. Tesla was not able to recreate the problem and never found any problems with the vehicle. This was not the first time we took the vehicle in for phantom braking. Tesla blamed the driver. I was also told by a tesla representative the the vehicle can brake unexpectedly by sensing a shadow on the road from a cloud. Apparently there is no way to disable this feature. The vehicle has been deemed unsafe to drive by our senior management as this is not the first time this has occurred and Tesla has not remedied the problem.
My car is experiencing phantom braking nearly every time I use cruise control. It only happens when there are no cars or other obstacles in front of me. It happens at various speeds. The braking slows the car to a stop within seconds if I don’t immediately disengage the cruise control, even at highway speeds.
Was at a drive through and took foot off the brake and barely put any pressure on accelerator the car went out of control — sudden acceleration.. First time this has happened with this car. Was definitely not working properly. Less than a second was at full Speed. Had to swerve to try and avoid the car ahead of me. Entire left side of car is crushed and torn apart.
We just completed a 6500 mile round trip road trip from So Cal to Toronto Canada and back. 5/24/22-6/12/22 During the trip we used the "Auto Pilot" with and with out "Auto Steering" Not Full Self Driving. I lost count of how many times we encountered "Phantom Braking" with the car at highway speeds. My guess would be at least 50 times. It got to the point where I would not use Auto Pilot especially when there was heavy traffic at full highway speeds. My deduction on why this is happening is that the Tesla cameras are "Infrared" sensitive and it seemed that the car was applying the brakes when it would see the heat waves off the hot road surface. Also in early morning one day the sun was directly behind us and the cars shadow was directly in front of us on the road surface and it kept applying the brakes thinking it was another car. In slow moving bumper to bumper traffic going 30MPH or less does not seem to initiate the "Phantom Braking". But at highway speeds it is super scary and dangerous when this happens. ;(
using autopilot adaptive cruise control, the vehicle on several occasions but mostly on non median highways the car for no apparent reason brakes hard. vehicles around me especially behind are put in danger by my sudden, hard braking for no apparent reason
I was driving to and from mammoth lakes California. Middle of the day, clear weather, with no other cars within thousands of feet if me. I put my vehicle into adaptive cruise control (not autopilot) and several times during the drive the brakes would slam to the point of reducing my speed from around 70 mph to roughly 40 mph very quickly. It was extremely happened and was repeatable but with no known reason.
The vehicle braked and slowed down on the highway for no reason when on autopilot. The speed of the vehicle was around 55 mph when suddenly it stated to decelerate for no reason. Ot resume speed after 100 ft or so
Unexpected and rapid slowing/braking of vehicle since new in November of 2021. Occurs when on cruise control usually at highway speed, more often on open highways and have possibly (though not always) related it to cresting a hill, distant reflective “water mirage” on our western roads, passing large trucks, two lane highway having large oncoming trucks +/- on curves. On one occasion while passing a semi truck with car on my tail came within a foot or so of being rear ended. Many other occasions where got to point I do not feel safe using the cruise control. We have driven it from Denver to Tucson in November and back in May, both times was worse on wide open western roads, sometimes tho not always with bright sun, pretty unpredictable and random but often to point of not using any of our autopilot or cruise control functions with confidence of safety. No warnings, lights or prehappening signs. Reported and examined in Tucson on arrival there in Nov/21. Told would “get better with time” and further hardware updates. Hasn’t happened with city driving (tho rarely use cruise control. Happened a couple times on highway drives in Arizona while on cruise and thought maybe better until recent trip to Denver when it was as severe as November. Again contacted Tesla and told would lengineers are aware of problem and would be fixed with hardware app fix at end of June. Recontact them in July if still an issue. When serviced in November for this issue tech said he could see in computer log what was happening. When I set up appointment this time basically said live (or die) with it until June and nothing they could do til “hardware fix”. In blanks below I entered last episodes date. It has been ongoing from 11/2021 to present at speeds from 50 to 80 mph. Started with first trip when less than 300 miles til present 5436 miles on it. Could almost guarantee it would happen on highway trip with cruise control if you would like to risk your life on a test drive.
Car consistently slows down to 25 MPH in 60MPH zone on i4 with Auto-Pilot enabled.
Driving on I-43 in Wisconsin on June 2 around 2pm CDT while in cruise control the car suddenly went into emergency braking and slowed down dramatically requiring me to override the system. There was very little traffic and a semi-truck about 200-300 yards ahead of me.
My Model Y Tesla, while driving on the freeway using full self driving, would abruptly slow down from 70mph to 40 mph in matter of seconds without warning and luckily there was nobody around me. I did a bug report on it many times but Tesla discounted that. Also my front windshield wipers would come on for no reason even on a sunny day. Sometime on a raining day when going into a tunnel the windshield wipers would stop and would not come back on when I get out of the tunnel and that is really scarily as I was unable to see during heavy rain. I had to manually turn it on and that took a few seconds and in the meantime I could not see anything due to heavy rain. I brought this to Tesla and they told me that the windshield wiper control and the headlight use the same sensor and there is nothing I can do except to place the windshield wiper on manual mode. The rain detection wipers are on many different model cars without issues. I am not sure why Tesla could not add an additional sensor just for the windshield wipers.
On multiple occasions, I have experienced the "phantom breaking" problem when using either adaptive cruise control or the limited self driving feature on my Tesla. I've experienced the problem when driving in traffic (me in another lane, passing a larger vehicle) when the breaking system will activate and all kinds of warning sounds given by the vehicle. I've also experienced the problem when driving alone on the highway (no traffic in either direction), usually in daylight conditions, when the breaking system activates and alarms go off. Additionally, I've experienced the problem when cruise control is activated and a vehicle turns in front of me (either in the same direction or sometimes when turning on a cross street), it's just strange for this to happen when the vehicle is about 1/4th of a mile (or more) in front of me and the turning action of the other vehicle will be complete without causing any concern for my vehicle. This has happened 30-50 times since I purchased the vehicle in late September 2021, so I don't have specific dates for each of these occurrences but it happens so frequently that I pretty much don't use the cruise control or self driving function anymore.
Phantom braking on highway when using ACC and FSD. When going 80 mph car will suddenly brake for no apparent reason. This happened over 12 times in one day on a recent trip. I sent video clips to Tesla for every event. This is the second report of this defect. I have ever had and ACC act this way. I am afraid I will get rear ended.
While driving using cruise control or auto drive the car randomly brakes while at highway speeds. There are often no cars or objects in front of the car. I have almost been rear ended, because the car hit the brakes to almost stop. This happens every time the vehicle is placed in regular cruise control or auto drive.
On or about 4:30 pm Monday, May 16th there were two instances of unintended braking. Then at approximately 10:30am on 19 May another 6 instances of unintentional braking occurred. I believe this is a serious safety risk and Tesla should be required to correct.
Repeated random automatic braking while using cruise control at highway speeds. Near miss of rear end collision. Tesla service representative just said to live with it and be careful.
While in cruise control, our 2021 Tesla Model Y (WE DO NOT HAVE AUTO PILOT!) applied the brakes HARD dropping between 10-40 mph with no warning. Cruise control stays active. There were no cars anywhere near us, either in front or in the rear. Over thirty (30) Tesla bug reports were recorded on April 25 and April 26, 2022. While we were not SERIOUSLY hurt, had a vehicle actually been behind us, we would have ended up with a vehicle in our back seat and certainly serious injuries. This same thing happened six months ago on our last road trip. Tesla has blown us off saying that this simply cannot occur. Their response is that the computer cannot slow the car without seeing something. Therefore it must have seen something. This is circular reasoning and is meant to blow off the consumer. This is a serious safety issue. The braking on occasion has been violent. This is similar to the reports in other models. Tesla has twice now, within six months, addressed this issue simply by saying "it cannot occur." Seriously?!
My 2021 Tesla Model Y, when using adaptive cruise control engages in phantom braking on a perfect clear road with no obstacles. On a recent road trip the vehicle braked suddenly at least 10 times while driving at highway speeds on both divided and single lane roads. This is cleariy unsafe especially if there is a car following. Tesla is aware of this problem and has done nothing to resolve it.
I was about to park the car in my garage and stopped midway down my driveway to take a phone call. After the phone call, I changed it from park to to drive by stepping on the brake and lightly stepped on the accelerator to ease it into the garage. It quickly accelerated. I stepped on the brake to stop it but it failed to stop. It crashed into my refrigerator in the garage. A video is available for you to view
On 3/7/22- 3/15/22 I and my wife took our Tesla Model Y 2021 for an extensive trip from San Diego, CA to Sedona, AZ. Our Tesla does not equipped with Autopilot. On 3/7 while on I-8 E Arizona, our Tesla was on cruise control at HWY speed, it suddendly braked from 75 miles/hr to 60 miles/hr and slowly going back up without any appearance reasons! There was No cars near and around. Afterward, it happened several more times so we stopped using cruise control on the second day of our trips until return home due to safety concerns of getting hit from behind. I took the Tesla to Tesla service for a check of the issue about a week after return San Diego, and the Tesla technician took the car for a test drive and found nothing wrong!
Frequent abrupt and unsafe phantom braking while using cruise control. Mostly due to headlights from semi-trucks coming in opposite direction but occasionally from just a dark patch on the road. On a long road trip from WA to AZ, it made using the speed control feature impossible. The vehicle would lurch hard enough to physically throw you forward in your seat and rapidly slow the car (increasing potential to be rear ended). No warning messages or failure notifications. The problem was reported to Tesla (not to police, insurance, etc because no accident ensued) and the response was in a nutshell “it is working how it should “.
The Tesla’s operating system on the center screen froze. I was unable to view speed. I was also unable to turn on wipers, blinkers, or switch headlight beam setting. The operating system had to be rebooted while driving. This has happened twice. The first time was 2/11/2022, on I40 W in TN. The second time, noted below, was on I65 S in AL.
We've owned this car since delivered in June 2021. Took a trip from AZ to MO in July 2021. When using cruise control, the system occasionally and severely activated the brakes when passing a large vehicle on a four lane divided highway and in some cases no one else was around on the 4 lane divided highway. Auto braking only happened if on cruise control and did not occur if cruise not activated. I mentioned this to a service tech at one of the charging stations in Rolla, MO who indicated it was a known issue and they were working on it. I didn't report it to Tesla thinking it was being handled, but now I see many others reporting it and you dates indicate cars produced prior to April 2021. I'm assuming ours was produced around that time.
Vehicle brakes randomly at highway speeds while utilizing ADAS. Brakes hard and fast without warning.
While using adaptive cruise control on my Tesla Model Y on a 1974 mile trip to Florida and back the car would emergency brake for no reason. This happened at least 25 times on the trip. I believe this is being referred to "Phantom Breaking". So far I have been lucky and no one has rear ended me but that is a strong possibility.
While using the ADAS the Tesla had several incidents of phantom braking. We would be going 80 and it would slam the brakes on and take us to 50. It did it several times on a drive from Dixon,CA to Flagstaff, AZ. There were no cars near or anything remotely concerning on the road at the time the incidents took place. We called Tesla and reported and they could find no codes or system issues.
Without warning and with the lowest setting for front impact prevention my cruise control randomly slams on the brakes. This happens basically anytime I use the cruise control, so I just don’t anymore to prevent possible collision. It happens when no cars are around, when cars are in the oncoming lane but not crossing the line. It happens in any situation and it is very frustrating. I put in a service ticket with Tesla, to my understanding there is not currently a fix.
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