2021 TESLA MODEL Y Vehicle Speed Control Problems

While driving with cruise control set to 70-74mph, we had several incidents of phantom braking on a recent road trip. From 70mph with no obstacles, trees, structures, or other cars in sight, the car would suddenly brake itself. This happened multiple times, sometimes just a minute or so after the previous time. We were saved from being rear-ended only because the cars behind us were far enough back, but it was terrifying nevertheless. We cannot use cruise control anymore. Tesla must address this totally unacceptable safety issue.

While driving on freeway on a clear day with no other cars in front of me the car suddenly hard brakes such that one could feel the anti locking activating. I was lucky there were no cars behind me or it would have been vary dangerous. There was a car on my right but it was holding its lane and there was no visible reason for emergency braking.

Adaptive cruise control has failed many times. Recently had adaptive cruise control set at 75 mph on interstate. With no warning, the car instantly slowed to 55 mph. If a car would have been behind me I would have been rear-ended. Or worse, if someone behind me thought I was intentionally braking hard or "squating" they could become angry and instigate a road rage incident. The car provided zero warning before it braked. The car has not been inspected yet. Yes, the car is available for inspection.

Using normal cruise control in the highway, my car brakes randomly and suddenly. This phantom braking has happened over 10 times in the past two weeks! It's very dangerous.

While car was on cruise control. The car went off cruise control without intervention or warning and slowed down quite abruptly. This occurred about 4 times in a 4 hour period while going interstate speeds.

I have experience phantom braking on my Model Y many times when I used FSD(full self drive) on the freeway. The car just randomly slows down / decelerates abruptly even if there are no obstacles or other cars in front. This results in a serious situation when the vehicle behind may ram into you causing a fatal accident. I have always reported this issue using voice control REPORT BUG and got acknowledgement saying THANKS FOR THE FEEDBACK. But I have never heard from Tesla that they have fixed or are fixing it. This is repeated happening every time I use FSD on freeway even as of last week (week of Aug 21, 2022)/

Autopilot was on during a light rain event where I was traveling less than the posted speed limit on the I95 northbound Highway. The autopilot appeared to force the car to abruptly jolt the steering wheel/tires, causing a slip/ hydroplane of the front end which forced the car into a left/sideways slide across the highway. The car slid sideways for about 100 feet or so before going straight into the concrete divider along the Highway (front driver side initial impact, then rear driver side 2nd impact). Control could not be regained with the vehicle. Steering did not work (tried to correct the path), it felt as if brakes did not slow the vehicle as the car approached the divider. Autopilot was fully engaged and lane keeping was active… with at least one hand on the steering wheel and moderate level of attention to the road. I must say I had...

While driving cross country on interstate highways using cruise control my car would try to stop itself. During a 500+ mile day it would do this 10x per day. Most times hard enough to engage seat beats. There has been no inspection. Tesla is denying a problem. The danger is if someone is following too close they could resend me. I was never in traffic when this happens. Never anyone in front of me or next to me when this happens. On line they call the phantom braking. I can’t tell if it’s braking, or the cruise control disengages and the car is suddenly stopping because of one pedal driving mode.

My wife and I have owned the Tesla Model Y for one year. We have taken it on several long distance drives from our home in Moscow Idaho to the Oregon and Washington coasts, Vancouver BC and Seattle. During each of the trips we experienced phantom braking when the car was driven with cruise control engaged at highway speeds on 2 lane highways. Phantom braking has occurred when 1) there was no oncoming traffic during daylight hours 2) with oncoming traffic that was not in our lane 3) when there was a slight turn in the highway and no traffic. The most recent phantom braking events occurred 7-14-22 and 7-30-22 on Washington highway 26. When the phantom braking occurs it appears to be random. The car will very quickly drop from 65mph to 55mph causing us a scare. We do not use the cruise control feature anymore on the two...

A. 3 or 4 times while I was driving on the highway with cruise control the car very suddenly de-accelerated even though the road ahead was completely clear. This happened before. B. Also later on the same trip the car hit a part of a tire tread left on the road. The underside of the car was apparently damaged. The screen message was "okay to drive. power reduced". Over next several hours the power, and later other functions like air conditioning, and maximum speed was reduced from 69 to 67 to 65 to 62 mph and message "okay to drive" was repeated. Suddenly while car had message of 62 mph maximum speed it suddenly wouldn't go over 37 mph. Seconds later it dropped to maximum 13 mph while still showing "okay to drive - 62 mph max speed". I pulled over on shoulder and car wouldn't go into drive function.

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.

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...

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...

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.

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...

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

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...

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.

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.

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...

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...

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.

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.

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.

We have noticed an increase in phantom Braking while using cruise control and/or auto pilot. Prior to November it would happen randomly and only on single lane highways. Now it happens every time we try to use cruise control. It is very dangerous as we may be rear ended it stops so fast with nothing in front of us. We have reached out to Tesla more than one time and they just suggest we disengage use if cruise control if we experience this random phantom braking. We have reported this is not rare or random it’s constant and every time we attempt to use this product we paid $10,000.00 for. We are not safe with this braking and Tesla basically says they are working on it.

While driving from Tucson to Denver the vehicle suddenly decelerated and/or braked no less than hundreds of times with varying rates--sometimes just a couple miles per hour and other times more than 30 miles per hour. These events were generally on a divided interstate highway with clear visibility, flat, straight roads without precipitation and oftentimes without another vehicle within 1/2 mile or more. These events even happened 3 times within 3-4 minutes while I was speaking to Tesla roadside service trying to disable all sensors/interventions. More than once there was a vehicle behind me at highway speeds that thought I was "brake-checking" them and would anger them and cause them to honk and give me a few finger symbols (road rage)... there was no reason for the car to suddenly brake; no cars merging or in front of me other than light vehicle traffic in the opposite direction of the...

While driving 50-55 mph down a two lane highway, with adaptive cruise control in place, the vehicle suddenly slowed and signaled a front collision by beeping. It was terrifying as there was nothing in front of us. It was a clear day and we were lucky that there was no car behind us, as it could have easily caused an accident. We are now not wanting to use our cruise control or the autopilot that we purchased for this vehicle, until more is understood about the cause.

On Friday February 25, 2021, while driving on Florida’s Tamiami Trail (41), my Tesla repeatedly experienced extreme phantom braking, even though there were no vehicles in front of us or behind us either in our lane or the oncoming lane. It was a sunny bright morning between 9:30 and 10:00 AM.

Car will suddenly brake hard when a pickup truck or semi truck is in the oncoming lane at highway speeds when adaptive cruise is engaged. This happens nearly every time a larger vehicle is in the oncoming lane, mostly only on two lane highways. Will also [XXX] occasionally brake for apparently no reason with adaptive cruise on. Tesla service knows of this problem and claims there is no fix. The hard braking happens every drive multiple times and nearly causes us to get rear ended by following cars. INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).

I was on a road trip and no less than 20 times over 10 hours, my car when standard cruise control was set, the car applied the brakes HARD for me without any warning. It went from scary to nearly resulting in a rear-end collision. The cause ranged from absolutely no reason except for maybe a slight dip in the highway(? weird) to oncoming traffic - standard, nothing close to an emergency situation. I had ALL auto features disabled and was just using the set speed feature. I've submitted a service request but the next appointment is in two weeks and in the meantime, I'm frankly scared to drive the car. It happened at 70 miles per hour and immediately dropped me down to 40 on the highway and I just about had to take a break from driving I was so shaken. It also happens on local backroads when...

44E east of Joplin car braked hard while on autopilot. Pressing the accelerator would override but as soon as you let up it would hard brake again even though the car was below the cruise control speed

While I’m adaptive cruise control or Autopilot the vehicle has phantom braking which occurs. Vehicle will slam on the brakes for no apparent reason.

When using autosteer or adaptive cruise on I5, our car performed a phantom brake that cause the truck behind us to nearly flip over in order to miss hitting us. We were not in the lane by the divider, there were wide open lanes in front of us to the left and right by half a football field and no overpasses at the time. We slowed from 69 to about 39 before I could correct the braking. This happens so often we do not feel safe using the cruise control at all.

On multiple occasions the car triggers emergency braking when no obstacle is in front of the car, often at high speeds. The car is not equipped with radar, and relies entirely on camera-based adaptive cruise control. this is a safety risk and possible rear end collision cause. Due to the lack of radar, the vehicle also accelerates to desired speed slowly when using adaptive cruise control while on interstate. Often times resulting in traveling under the speed limit for an extended amount of time, causing a safety hazard.