When passing below an overpass the car will rapidly brake from 80-60 MPH or 65-45 MPH without warning. I have to take over and speed up to avoid someone hitting me from behind. I believe the issue happens because the car for a second thinks you are driving on the overpass which has a much slower speed (25-40 MPH). Therefore, it brakes hard to match the speed of the overpass. When it is enough of a distance away, it goes back to the normal highway speed. This issue has happened many times since I bought the car and has not been resolved after many updates.
2021 Tesla Model 3 driver assistance complaints
Page 8 of 16: complaints 191 to 220 of 431, newest first, as owners wrote them.
While driving on highway, I have autopilot on, and out of nowhere the vehicle will engage emergency braking.
On multiple occasions, my vehicle has experienced the same “phantom braking” problem other Teslas have. This has happened when cruise control (autopilot) was enabled. No cars or obstacles were directly in front of my vehicle and the immediate breaking was unnecessary
Since purchasing my vehicle a year ago, it had has occasionally engaged the emergency braking system in situations where other cars have not been a threat or directly in front of me. This week, the system engaged when I was driving up an incline on the highway with no vehicles around me. Very disconcerting and DANGEROUS. As a result I deactivated the system. This is a flaw.
The autopilot used for automatic cruise control regularly brakes for unexplained reasons when there is no immediate threat. This is not only scary but it could cause an accident if other cars were right behind me. There is one part of highway 470 in Highlands Ranch, CO, where it happens every time, like autopilot is expecting the speed limit to drop so it slows way down for me, but the speed limit hasn’t changed. Other times it just happens randomly. It will happen at least once usually every hour I use autopilot.
I was in auto pilot (cruise control). The car was going at 78 mph. The brakes suddenly engaged for no reason. Slowing the car to 60 mph very quickly. It basically felt like I slammed on the brakes. This happened 3 times.
While driving on the highway, , this car continues to phantom brake at high speeds which is dangerous. Both adaptive cruise control and “autopilot” experience this. It can be an overpass, cloud, or when the car sees it’s shadow. The phantom braking is a serious safety issue and makes me not want to use the feature. Tesla needs to improve this ASAP.
I’ve experienced the “phantom braking” most recently on may 29th, on highway. No cars around or anything that should have trigged it. I was in autosteer mode when it happened both times.
Driving at night, using adaptive cruise control, about 70 MPH, no other vehicles near by, multi lane highway, when pavement changed from black tarmac to lighter concrete surface, the Tesla braked hard automatically. I accelerated and disengaged the cruise control. No loss of control.
My car has on several occasions while using cruise control feature engaged, braked unexpectedly at highway speeds when nothing was in front of the car. My Tesla does not have Full Self Driving capabilities, it has also done this emergency braking with Autopilot engaged. It's happened so many times while the Autopilot is engaged, that I never use Autopilot anymore. I have twice nearly been rear ended, (with only cruise control engaged) by a car following me when this auto-braking happened in highway traffic, forcing me to have to immediately hit the accelerator pedal in response, to avoid being hit from behind after the brakes auto engaged.
This happens to me all the time. Especially on interstates such as I-4 in Florida. The car will suddenly brake with no warning, slowing down dramatically. For example, if driving at 80 mph the car will suddenly for no reason slam on the brakes to 50mph, almost having other cars behind me rear end me. This issue has never been dealt with by Tesla and Tesla claims it's a normal problem to have. I've never had any other car with adaptive cruise control do this.
When Autopilot is engaged the vehicle will sometimes rapidly slow down unexpectedly. There is no visual or audio warning to accompany the slow down to indicate what the vehicle detected to cause this. It is a rare occurrence but could potentially cause an accident in heavy traffic.
While driving with cruise and steering control, car will emergency brake like something is in front of the car. Many call it "phantom" braking. One time on a 2 lane highway the car braked hard for no reason, it happened on the way to Vegas and a large group of bikers were behind us. Very scary at highway speeds. We let the bikers pass.
Vehicle will engage breaks when there is no obstacle or while on a straight road when placed in cruise control.
Car brakes heavily and suddenly for no reason while using cruise control. Seems to be on 2 way roads when semi-truck is passing by in opposite lane. Has happened multiple times on different days under different conditions. Concerned about being rear-ended. I have not had this inspected and no crash has occurred. I stopped using cruise control on this vehicle due to safety concerns.
While using cruise control on the highway, I was rounding a slight bend in the road and the automatic braking system actuated, immediately slamming on the brakes and scrubbing off significant speed. Luckily I was close to the accelerator pedal and was able to quickly react by applying throttle, but had there been another vehicle following closely, there could have been a collision. There were no visible objects in or around the road to cause an emergency braking event. I have not used the cruise control feature since this occurrence, but it had happened twice before with similar circumstances. Reference "phantom braking" phenomenon well documented by many other operators.
Sudden unexpected deceleration. There was no car or obstacle in my lane and my car hit the brakes. It seems to have gotten worse with the latest firmware update. It seems like when a shiny object is on a mailbox near the side of the road the car hits the brakes. The truck behind me could have hit me and got very angry and sped around me. This is going to cause an accident if not fixed. It's happened multiple times now.
The car, when using its "traffic aware cruise control" exhibits extreme sudden breaking for no reason (phantom braking). On Thursday, I was on a major interstate in the middle of the day, perfectly marked lanes, no gradient changes, no weather or visibility issues, with absolutely nothing in front of me. The car would suddenly brake aggressively for no reason, sometimes hard enough to hurt my neck. If another car had been following me, I would have been immediately rear ended. Too add insult to injury, Tesla charges for the full self driving function which fully navigates the car on highways, and even though it is so dysfunctional that it is dangerous, they will not refund it after I reported this behavior. Tesla FSD and traffic aware cruise control, in it's current state, is a danger to the public.
The Tesla Autopilot system in my Model 3 repeatedly malfunctions by way of "phantom braking".The latest incident I was luckily able to capture on camera. In this incident, my vehicle is driving down a Nevada highway in the heat, with no oncoming vehicles and a vehicle in my lane well over a mile away and increasing (they had just passed me a few minutes prior). With the speed set to 74mph (driving 73 at the time) the vehicle proceeds to apply heavy brakes, and slows to 56mph for no reason (no vehicles behind, thankfully). My safety and the safety of other motorists is put at risk with these events as the unexpected braking not only whips around the passengers of MY vehicle, but also puts at risk any vehicles that may be behind me, expecting me to maintain my current velocity. The problem has not been reproduced by a dealer as far as I am aware, but the service department of my local Tesla dealer has confirmed the issue is caused by the "Tesla Vision" camera-only system. They (service team) claim that there is no issue with the system, and that it is behaving as expected. They do not view this as a malfunction, and merely view it as the system being extra cautious, which is simply lazy. This component has not yet been inspected by any entity mentioned above. There were no symptoms of this issue prior to it occurring, however this did occur repeatedly over the course of my trip to/from Las Vegas.
Side camera glare at night when signaling
Referred to as "Phantom Braking," the vehicle decelerates dramatically when in "Autopilot" mode. This happens at seemingly random times and locations. It happens in the day or night, open or populated roads, multi-lane highways or single lane. The deceleration is so sudden that passengers in the car are thrown forward. One instance the car decelerated from about 75 MPH to 45 MPH in a matter of about 2 seconds. Thankfully no one was behind me. Others worry that if someone is following too closely, they could rear-end the Tesla... I don't think a vehicle would have to follow all that closely for this to cause an accident.
Tesla Autopilot will disengage and brake when driving under a bridge or a freeway sign. Tesla detects the overhead object as an object on the road and logs a forward collision warning. This issue has been reported to Tesla and after multiple service appointments, tesla has failed to fix the issue. Tesla logs forward collision warnings and determines safety score for insurance price, having multiple false forward collision warning reduced the score and increases the premium which in return benefits tesla financially. I have video evidence for an instance that I have provided to tesla to look into and the issue is still not fixed.
It has happened before, but on a 4 hour highway trip yesterday, the vehicle engaged in 3 incidents of sudden phantom braking. Twice the road was completely empty with no other vehicles around me. The third time the shadow of a truck in another lane may have triggered the event. Each time we were traveling over 65 miles per hour. For the last hour+ of the trip, I disengaged the autopilot (adaptive cruise control) feature and drove completely manually.
The car, driving on cruise control at 75mph did an expected and very sharp braking and slowed down to 55 mph. There were no upcoming alerts or indicators of this to happen. The braking was sudden and definitely not expected by drivers behind. This incident was reported to Tesla service team.
The contact owns a 2021 Tesla Model 3. The contact stated while driving approximately 60-70 MPH with the adaptive cruise control engaged, the vehicle experienced phantom braking. The contact then accelerated and continued driving. The contact was unsure whether there was a warning light illuminated. The contact stated that the failure had been reoccurring while driving alongside other vehicles. The dealer and the manufacturer were not notified of the failure. The vehicle was not diagnosed or repaired. The failure mileage was approximately 900.
While driving, typically on two lane roads with oncoming traffic, the vehicle will suddenly break hard for no visible reason. Often it is the case that the vehicle breaks so hard that things in the car fly forward and the seatbelts lock up causing people to grunt at the force and scream. This happens while using full self driving or just regular cruise control. There is no warning and people behind my vehicle have a high likelihood a rear ending me since there is no visible or obvious cars for my breaking. Also it would appear that I am brake checking the person behind me, causing them to become angry with me through no fault of my own, but it is understandable based on the reaction of my vehicle. When this happens I typically report the issue directly to Tesla using their voice feature to report issues. The command is typically “bug report phantom braking.”
My Tesla has continued from the time of purchase has Fantom braked when no vehicles are even around. Putting it on basic Cruise control or adaptive control makes no difference. Slamming on the brakes at any time is not safe with all the tailgaters that drive today. Who’s liability is it when your car brakes for no reason a you are rear ended ?
The cars cruise control system is unusable due to random and unpredictable Phantom breaking. This is a safety risk due to the potential collisions it can cause as a result of slamming on the brakes. We have had multiple close calls with this system. It specifically has issues on two lane highways.
Brakes were automatically engaged and speed dramatically reduced on an otherwise deserted, two-line highway. Speed was reduced from 68mph to 30mph in a few seconds multiple times in the span of two hours. Adaptive cruise control was active at the time. This would put myself and any vehicles behind me in danger, so I disabled the feature for the remainder of the drive. The behavior has been reproduced multiple times since then, in various conditions. No warning lamps or other messages appeared at the time. I reported the problem to the manufacturer and schedule a service appointment. The manufacturer canceled this appointment, stating, "Our technicians will be unable to change this behavior."
While driving on the highway or freeway, the vehicle suddenly slowed dramatically as if the brakes had been heavily applied. It did this three times over the course of two days, always while the car was set on cruise control (not auto pilot).
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