The adaptive cruise control has had phantom braking issues from day 1 of ownership (and through every software release from Tesla as I always update when a new one is available). Most of the time it's not possible to identify exactly what triggers the event. However, on July 27th 2023 I drove from Phoenix to Sacramento via I10, I210, I5 and had 6 phantom braking events. 5 were directly correlated with passing a semi with me in the #1 lane and the semi in #2. I had the car in adaptive cruise control mode, but I maintained steering control. The car approached the semis normally, but as soon as the car was completely alongside the truck it began braking aggressively. More than just allowing regenerative braking to slow the car, the brakes were applied. This did not happen with every passed truck, maybe 1 in 10. One of the 6 phantom events could not be correlated with any clearly identifiable cause. There is no warning when the car begins decelerating so it is a surprise to the driver. Further it is an extreme hazard to following vehicles who WILL be forced to react. I have not directly reported my specific events to Tesla. For one thing they have no reasonable way to do this (online access, phone access. The number they give to report problems hits an automated phone tree where there is no option for reporting issues). Clearly Tesla is well aware of their phantom braking issues. I'm reporting this to you now in order to apply more pressure to Tesla to finally resolve this. In general, considering some of the other phantom braking episode beyond this one specific trip, I have occasionally noticed the car displays a yellow signal light on the driver's display but only while phantom braking has already begun. I believe this is case where the car believed it saw a caution sign or signal light in it's cameras and was reacting to that. There were no signal lights, but the sun was either coming in that direction or reflected off of other vehicles or buildings.
2021 Tesla Model S driver assistance complaints
Page 2 of 3: complaints 11 to 40 of 52, newest first, as owners wrote them.
Adaptive Cruise Control. The vehicle in this mode suddenly brakes for no apparent reason which under the right circumstances could cause a collision. Tesla Service Center looked at it but could not reproduce. This has happened many times on various dates not just once. Sometimes it happens more than once on a trip, sometimes it does not happen. This happens with no warning. Tesla knows about this problem for years but has failed to correct.
Going north on New York State highway I-87, there is a bridge which results in Tesla Autopilot erroring EVERY TIME AND EVERY DAY and results in a "Full Self Driving Error" which causes Telsa car to brake along with putting on hazard lights. Issue was reported to Tesla, but they responded that it happens to everyone under this bridge so there is nothing they can do right now. The fault occurs on a busy highway at 55mph zone, and happens 100% of time going under the bridge, every single day. The bridge is wide enough that shadow results in error and car loses all understanding of what lane it is in. Today at the Tesla service center, the employees all reported the same issue as well and that there is no idea if it will be fixed. Happens only when using FSD/AP driving support; manual driving is unaffected.
There was a trash can on the edge of the road and my vehicle was in autopilot/FSD mode and for some reason it swerved over too close to the edge of the road. I intervened in time to avoid hitting the trash can head-on but it still struck the passenger side mirror and scraped across the passenger rear fender. The mirror got slammed into the passenger side door causing damage to the door and trim at the bottom of the passenger side window.
On 10Jul2023, approximately 1:00pm, while traveling southbound on Hwy 69, south of Toll Road 49 in Lindale, Texas, while driving in the right lane and speed set at 75mph, when all of a sudden the car activates the right blinker and - without slowing - pulls into a fairly short, dedicated right turn lane that turns into a business. At the end of the turn lane is a drainage culvert. The route of travel did NOT include a turn and the car should have been continuing straight down the highway. The car enters the turn lane and never slows from 75mph. I immediately hit the turn signal button to use the camera to get a look to my left to see if a car is there and also look over my left shoulder when there was no response (no camera) to activating the left turn signal. This all occurs as my hand is grabbing the yoke and my foot moving to the brake. I see the blue "path indicating line" wavering left and right and then lock into a right turn into the business parking lot at the end of this dedicated turn lane. Again, there is a culvert at the end of the turn lane also. As soon as I see over my shoulder that the lane to my left is clear the car attempts to make a 90 degree right turn at 75mph. At that exact moment I am able to yank the yoke left and tap the brake to disengage the Full Self Driving Beta as the car is starting the right hand turn. The rear end of the car breaks loose and slides as I get the yoke steered into the right hand lane of the highway. I allow the speed to bleed off to get the rear tires behind me and continue on. My dog has been thrown around the back of the car, my wife banged her head on the passenger side window. This whole event occurred in mere seconds.
Third time this week I have been thrown forward into the steering wheel with no cars or objects surrounding me.
Another automatic phantom braking throwing us toward in the car with no objects or other cars in proximity.
Oncoming vehicle suddenly turned in front of 2021 Tesla Model S resulting in collision at 34mph. Automatic braking did not engage, collision warning system failed to sound alert. Air bags deployed however seat belt completely spooled out causing the driver to strike the windshield and break the glass by contact with the top of the head. The vehicle was a total loss and the dealer never inspected the car.
When using adaptive cruise control vehicle randomly applies brakes while driving at highway speeds, for no reason. Sometimes braking is severe, sometimes moderate, sometimes light. In the instances of severe or moderate braking, a real danger exists that following vehicle will be unable to stop and will collide. This happens relatively frequently, particularly on some highways. Sometimes multiple incidents occur on one drive.
Vehicle is typically operated in FSD Beta mode. I have had approximately a thousand driver initiated disengagements due to unsafe or potentially unsafe operation in Beta mode. At times there have been indirect indications of unintended vehicle operation potentially due to anomalies with system hardware and communications between modules and control systems. The refreshed S and Y models feature a vehicle display behind the yoke steering wheel. When at stop signs, stop lights, or when turning, the yoke (in an upright or near upright position) blocks safety related displays indicating intended vehicle path, bollards and critical safety-related driver annotations. Visibility of these safety critical displays is further degraded when stopped making unprotected turns with the yoke erratically moving. The ability of the driver to safely takeover control of the vehicle is further degraded by the chaos associated with the yoke whipping back and forth on unprotected turns, and drivers and passengers being unable to see critical displays. When the vehicle, driver and passengers all have a reduced capability to ensure safe operation the chaos further degrades safe vehicle operation. At a minimum an over the air recall is required to add safety critical displays/annotations to the large rectangular display between the driver and front passenger similar to Y and 3 models. As noted above I also have hardware related concerns on my vehicle which at times appear to be masked/accommodated by the firmware but are more evident on secondary systems independent of safe vehicle operations.
The Traffic-Aware Cruise Control has been braking unexpectedly and for no valid reason. The most recent example was when we were driving along US Hwy 24 between Wilkerson Pass and Fairplay, CO. The car suddenly braked even though there was no hazard. This has been happening regularly on this drive, in both directions, multiple times per drive. When this happens, the road is generally straight, with little, if any, elevation change. This is a safety issue because if this happens when a car is driving closely behind us, the unexpected braking could result in a rear-end collision. I have not reported this to Tesla because I understand this is a widespread issue that many people encounter, so I believe Tesla is fully aware of the issue. This problem seems to have gotten significantly worse after Tesla deactivated RADAR in the vehicle (without my consent). My understanding is that they are now using only cameras to manage Traffic Aware Cruise Control. Regardless of the reason, this issue has been happening with much greater frequency since around December, 2022 or January, 2023.
Our Tesla, in the "Full Self Drive" mode, has on more than one occasion applied the brakes suddenly without warning while traveling on the freeways. The date I indicate below was the last occurrence. I see that others have indicated this malady and I wanted to add our voice to this conversation. Thank you
When in autopilot, at highway speeds, the car suddenly will brake. There is nothing that instigates this and it seems to be a safety hazard.
In August 2022 I was driving my Tesla S. I was traveling 25 miles an hour or less. I unfortunately lost consciousness for a very short time. My tesla then crashed into a parked car. There was snow emergency braking nor any emergency alarms. In theory describes shouldn’t of happened with an emergency braking system.
Today was at least the 3rd time "phantom braking" has occurred. While traveling on I-64 in Virginia, my speed was about 75mph with adaptive cruise control on. Suddenly, the car braked hard, slowing to about 40mph. I thought the car was going to stop. Fortunately, there were no vehicles behind me or there could have been a rear end collision. I did not use the automatic feature again for the rest of that drive.
Car repeatedly, randomly slams in brakes while cruise control engaged for no apparent reason. Not speeding, no other cars or blockages around, open highway on a bright, clear day.
The vehicle intermittently brakes for no reason with the cruise control enabled. This is going to cause an accident.
I have had multiple phantom forward collision warnings while driving and phantom braking while in autopilot. It happened twice today on a short 10 mile drive.
The contact owns a 2021 Tesla Model S. The contact stated while driving 70-75 MPH with the Autonomous Self-Driving feature activated, the vehicle experienced phantom braking on numerous occasions. The dealer was made aware of the failure and informed the contact that the vehicle performed as designed. The vehicle was not diagnosed nor repaired. The manufacturer was made aware of the failure. The contact related the failure to the Full Self-Driving (FSD) Beta 10.69.2.2 software update. The failure mileage was 17,102.
On at least nine occasions the car has very suddenly and with no input from driver braked hard during passing another vehicle, when assuming the original lane after passing a vehicle, and, on one occasion when no other vehicle was close by. I have brought all incidents to Tesla's attention. They tell me the problem resides in the software of the car and that they "are working on it". This is a very serious problem, which has been going on for over a year in my case. A totally unacceptable and extremely dangerous situation! Occurred in December 21, 2020; Several times during the summer of 2021, other sporadic times, and most recently on September 6 and 8, 2022
The contact owns a 2021 Tesla Model S. The contact stated while driving 72 MPH with the autonomous self-driving feature activated, the vehicle experienced phantom braking. The vehicle was not diagnosed nor repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was 56,292.
While using wildly falsely marketed $10k "full self driving" add-on across multiple software revisions and after reporting each and every bug to company I have experienced potentially fatal phantom breaking while at highway speeds and could have been killed by rear ending on at least 4 occasions. Have experienced 20+ erroneous forward collision errors with automatic breaking or lane assist corrections for obstacles such as hills, mailboxes, trees, absolutely nothing at all, etc. When driving around mildly banking left turn corners with 45mph speed limits whenever approaching a left turn lane within median the car will violently lurch into the turn lane causing panic for passengers and nearly causing a collision within resuming concrete median. While using autopilot the car failed to stop, correct or warn when a vehicle entered my lane and caused an accident with several thousand in damages. Car does not properly break for turns on highways requesting driver take over for what should be an easily navigable turn. Doesn't take apex or break early and will drift lanes making other surrounding drivers nervous. Moving the horn from muscle memory location to awkwardly placed touch button has prevented timely use of horn on multiple occasions which could easily result in fatal accidents. Overall this car is a literal death trap not at all even remotely ready for production use on public roads and neither I nor any of my passengers feel safe using the feature that was over priced, over promised and under-delivered. Tesla service center employees too worried about retaliation from management to inquirer about problems because of previous reparations from corporate offices. List of problems is shockingly egregious and should not be legally permitted on roads.
On 4 Aug 2022, at 10:24am (CST), while traveling northbound on Hwy 287 just south of Henrietta, Texas with the Tesla Autopilot speed set at 80mph with a posted speed limit of 75mph, the car was in the left lane of a two-lane, high-speed highway, when the car suddenly and unexpectedly slammed on the brakes, gave a "TAKE CONTROL IMMEDIATELY" warning and rapidly shifted its lane position, almost causing a wreck with the car behind me. There were no vehicles beside me and nothing to the front or sides to cause concern or indicate that there was any reason for the sudden and abrupt braking maneuver.
The contact owns a 2021 Tesla Model S. The contact stated while driving approximately 45 MPH, the vehicle approached another vehicle that had slowed for a traffic light and did not automatically start braking. The contact manually applied the brakes, but the vehicle crashed into the rear end of the vehicle in front. The contact stated he noticed no warning lights illuminated nor warning chimes sounded advising of a vehicle ahead. The contact said both air bags deployed. The vehicle had crashed and damaged the entire front end which crumpled to the front tires. The police were on the scene and filed a report. The contact and the occupant of the other vehicle were not injured. The vehicle was towed to a collision center. The vehicle was not repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 1,000.
The vehicle put the brakes on when on adaptive cruise, but with very few cars around. The last time, there was no car in front of me, but the vehicle braked so fast the the car behind me almost rear ended me. I’ve noticed that it happened twice on a South bound stretch of I-35 in Temple texas. This needs to be addressed or there is a strong potential for an accident.
The contact owns a 2021 Tesla Model S. The contact stated while driving approximately 20 MPH or slower, the pedestrian alert warning system failed to activate as designed. The vehicle was taken to the local dealer to be diagnosed; however, the mechanic found no failure. The contact related the failure to the federal safety agency Campaign Number: 22V235000 (Electrical System, Forward Collison Avoidance). The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 6,000.
On March 18th and March 19th we have experienced 4 episodes of unexpected emergency phantom braking while using auto pilot. Once on the 18th and 3 times on the 19th. Only once was there another car in our vicinity and that car was next to us within their lane passing us at the time. All 4 times the cars collision warning chimed and hard emergency braking was applied by the car for no reason. If there had been cars following us we would have been rear ended. To date these are the only times this has happened. Tesla says they have no current fix. There was no indication of any problems with the auto pilot/collision warning prior to this.
With autopilot engaged, the vehicle will randomly apply brakes at highway speed with no vehicle in front of it at a distance of at least 1/2 mile. The issue seems to be weather independent. The issue occurs on every occasion where autopilot is engaged at highway speed. I scheduled a maintenance appointment for the issue. My last Tesla model S (2018) did same thing with less frequency. Severe auto braking at highway speed presents serious danger to vehicles behind me.
Car experienced “phantom braking” at freeway speeds (it suddenly and unexpected applied brakes by itself) - AutoPilot was engaged and was on freeway. There were no vehicles or objects in front of car. It was a multi lane freeway and multiple lanes on either side. Was extremely dangerous and could have caused a severe accident had i not taken evasive action and taken control/overridden immediately (would have otherwise been rear-ended).
Third time this has happened on my new Model S Plaid. On Autopilot, the car randomly slams on the brakes when we were driving down the interstate at 70 mph for no reason. There were no other cars around us.
VIN decoder
See the problems and recalls for an exact car
Buying a used 2021 Tesla Model S?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history