Adaptive Cruise Control problems of the 2020 Tesla Model 3 - part 2

Vehicle suddenly braked while traveling 70mph on freeway with traffic aware cruise control engaged. This incident happened 3 times during the same 40 mile trip. No other vehicles were within 50 feet of the vehicle in either direction. A rear end collision could have happened if another vehicle were behind me. No warning sounds occurred or warning indication on the computer screen. I purchased this vehicle used from Tesla 3 days ago. Tesla service has not been notified of issue.

I was on a 3000 mile road trip over multiple interstates (including I-35, I-90, and I-80), and while the adaptive cruise control was engaged, the car would abruptly and aggressively brake when no other cars or obstacles were in the area. This would often be a 30mph deceleration before I could disengage cruise control and take over. This happened repeatedly, in multiple states, and in different weather conditions. At times, it was happening every 10 minutes. The system would sometimes, but not usually, make an alarm noise. This problem has become noticeably worse in later software updates. No accidents occurred because I would not use cruise control if other cars were in the area, and I eventually stopped using it altogether due to how frequently it was braking.

Since recent software update the adaptive cruise control now randomly applies the brakes while driving on a straight road with no obstacles or vehicles in front. Today driving i80 through navada this happen about 5 times within a few minutes of engaging cruise control. This is a new issue I’d not seen until now. I’d had maybe 2 or 3 incidences of phantom braking over the last couple of years. Today I had it happen multiple times through the day.

Since recently updating the software I now get a lot of phantom braking when employing adaptive cruise control. This hardly happened in the past. Recently it’s happening every time I engage cruise control today we drove from san francisco to utah on the i80 the car randomly braked 5 times each time the road was flat, straight with no traffic in front or obstacles or road cones. After engaging cruise control the car would randomly brake aggressively with a few minutes. I would turn off cruise control then try again a few minutes later. The same throng would happen speeds ranged from 65-75 mph.

I get "phantom braking" on average about every 2-3 hours of highway driving with cruise control enabled. All of a sudden without any road obstructions or vehicles ahead, the car will suddenly break hard even at highway speeds. Sometimes it happens when I approach an underpass or get to a section where the pavement is darker than before.

The adas system for the car includes automatic steering, which only works at the speed limit detected or less. The car incorrectly sets the speed limit in many instances as much as 30 mph under the limit. It isn’t safe to drive the car at such a different speed than the rest of traffic. Tesla claims it relies on map data and can read speed limit signs. Most rural roads have no posted limit, so they default to 55 mph. Even in the presence of a posted speed limit, the car defaults to their bad map data within seconds of passing such a sign. Tesla has no mechanism for reporting this bad data to get it corrected. This has been ongoing for more than a year.

Driving on interstate 295 (it is unclear what the official direction north, south, west). You are going south toward philadelphia. Some signs say north but in reality it is only for a mile or two then the road bends due south. Every time I travel on this road and just before the scuddersfall bridge, the car brakes to 30 mph and it does it again on the other side of the bridge (the same direction). I have reported this many times on Tesla's "bug report" and for the 2 years + nothing has been done to correct the problem. The car doesn't have a problem in the opposite direction. I usually take it off the autopilot at this location to prevent the braking.

On a recent trip, while using the adaptive cruise control on a divided, straight, flat four lane highway, the vehicle would randomly slam on the brakes for absolutly no reason, endangering us and other vehicles behind us, who were not expecting a random slam of the brakes. Driving conditions were ideal - sunny, excellent visibility and very low traffic. There were no oncoming or road-crossing vehicles and no vehicles in front of us on the divided highway to trigger the reaction. This happened 14 times over about 200 miles of driving on our return trip home and over 30 times on the trip out. On the outbound trip, I was using it on both the divided highway and sections where there was only one lane in each direction, so decided to just use the cruise control when there was a divided highway. This is a recent phenomenon, as cruise control has never done that before. The semi-autonomous mode does it all the time as well, so we stopped using it for fear of causing an accident.

Using autopilot on an empty highway at appx 65mph, the auto pilot system began to brake aggressively without any obstacles in front of me. As it approached 40 or 30 mph, I pressed on the brake to cancel the autopilot before I was hit from behind. Scary.

There have been recent reports of Tesla fsd accidents that are now under investigation by NHTSA relating to crashes that occurred under difficult visibility conditions. A video I recorded several years ago while driving into a fog bank in NW washington, about an hour north of seattle, is linked below. Seeing the fog bank ahead and with no traffic in front or close behind me, I let the car proceed into the fog until the system triggered a takeover alarm. Usually, at this point several years ago, when the driver wanted to disengage fsd, the driver did so by raising the gear selection stalk. Raising the gear stalk disengaged tacc only in this incident, and autosteering remained active. (see: [xxx] ) after disengaging tacc, the car was slowed by regenerative braking but still under autosteering control. Turning the steering wheel finally disengaged autosteering, but that occurred second and was delayed by the driver's confusion over why raising the gear stalk wasn't enough to stop the alarm. Applying the brakes would have disengaged fsd completely - but that wasn't wise with low visibility. I tried re-engaging fsd briefly while still in fog (not shown in this video), and the system refused. This brings to mind a previous documentation video where, with fsd engaged, turning the wheel disengaged *autosteering, but *tacc remained active. Again, the driver was not initially cognizant that tacc was still active (see: [xxx] ). I believe a subsequent recall remedied this 2nd example, but perhaps the fog bank-type takeover alarm was not affected by that recall remedy. Finally, I have one more video documenting the ability of fsd to see under challenging conditions, in this case, light rain, heavy rain, and eventually hail. No alarms were triggered (see: [xxx] ). Note: I no longer own the vehicle associated with this VIN. See the firmware version shown in the video for approximate dates of these occurrences. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

When using autopilot cruise control, the car will brake hard for no apparent reason. I only use cruise control on limited access highways. When this happens, I immediately disengage cruise control and drive manually. This can happen at any time. I have driven the car cross country several times, driving all day. Some days it won’t happen at all, and on some days it can happen several times. I’m concerned that if someone is close behind me, they could hit me from behind. This has been happening for the past two years.

The contact owns a 2020 Tesla Model 3. The contact stated that while utilizing the adas features including the adaptive cruise control, the vehicle independently applied the brakes while driving at highway speeds. No warning lights were illuminated. The vehicle was not diagnosed. The vehicle was not repaired. The dealer nor the manufacturer was notified of the failure. The failure mileage was approximately 25,000.

Phantom braking/slowing. Also, please do what you can to stop deployment of fsd by the end of 2022. Not only is the car and drivers not ready for it, the infrastructure is not as well. In addition, the 100% reliance of cameras for auto aware cc and fsd is absolutely flawed. Tesla must add radar—better yet, lidar—to their vehicles irrespective of fsd but, absolutely for fsd if they insist on pushing it before drivers, infrastructure, and the vehicles are ready for it. My opinion, fsd should never be allowed on any vehicles—maybe by the 22nd century….

Phantom braking when using cruise control. Happens practically daily, but most recently this morning at 9:25am.

Traveling on a clear, dry highway on a sunny morning and once again the next day we experienced phantom braking. This occurred three times in two days. In all cases we were traveling at 75mph and were using the adaptive cruise control. In all cases there were reflections in the road from the heat mirage or from something far down the road. The car acted as if it saw something in the road and braked sharply. The driver had to accelerate to override the braking.

While in cruise control the car baraked excessively on a straight 4 lane divided highway even though there was no other vehicles in front, to the side or coming on the opposite direction. This happened on 101 north of paso robles.

Phantom braking has occurred numerous times on cruise control. No cars or other objects nearby. Set up appointment with dealer but the service dept said they are aware of the issue and at this time nothing can be done.

I had 2 incidents of "phantom braking" in the vehicle this past week. I was just in cruise control, and the roads were in good condition, visibility and skies were clear, there were no cars in front or behind me, and we were cruising about 70 mph. In 2 cases, the car just slowed by itself for a few seconds and then I disengaged the cruise control. In 1 other cases, the car made an abrupt braking from 70 to about 40 mph. I disengaged and then did not use cruise control any longer. I've been told by Tesla service that the car's "radar" feature was replaced/disengaged in lieu of Tesla vision, which apparently is in "beta" phase. In any event, this should not be happening, especially in just basic cruise control under ideal road conditions.

While driving on an open highway using the Tesla auto pilot (adaptive cruise control, not full self driving), we experienced 3 separate instances of unexpected braking. In each case, we were on flat terrain with no vehicles in front of us for hundreds of yards. The weather was sunny and warm with few clouds in the sky. We were driving westbound between 10am and 1pm at the time of the incidents. During the first incident, the vehicle began to brake sharply and violently enough to startle, awake and scare a sleeping adult passenger in the front passenger seat. From memory, the braking rapidly dropped our speed by 15-20 mph. Thinking it was a simple glitch, I attempted to re-engage the system two more times and the same type of behavior occurred each time. I drove the remaining hours of our drive without engaging auto pilot. After researching the issue following the drive, I learned of the "phantom braking" issue many customers have reported. We then reported the issue to Tesla and created a service appointment to check out the vehicle. Tesla responded back that the ran a full remote diagnostic and the vehicle has no hardware issues reported by any sensors and said the service appointment was unnecessary because there was nothing to look at.

Driving on cruise control (not autopilot), in the following conditions: on an interstate highway with all lanes in the traveling direction clear, no obstructions and no traffic to the front or to either side of the car, on a straight road with no bridge or on or off ramp in front of the car, daylight and no rain or or other participation, the car can unexpectedly and without warning aggressively brake. If the driver does not immediately regain control of the speed (by pressing the accelerator, or turning off the cruise control) the braking has caused the speed of the car to go from 75mph to 30mph. Unlike other Tesla accident avoidance features, the braking occurs with no indication that an obstruction is being avoided. I have owned the car since it was new and until Saturday 8 October 2022, the adaptive cruise control worked as expected. Since that Saturday (less than a week) the braking has occurred several times. Each time it required a sudden depress of the accelerator pedal to recover speed control of the car. The first photo I've attached shows a screengrab of the moment of one deceleration on Monday 10 October saved as a dashcam video. As you can see there is no obstruction and no other traffic around the car at the time. The second photo is a snapshot of the chat session I had with Tesla service where they claim that this behavior is caused by a curve, off ramp, a bridge, a two lane road. As you can see in the first photo, none of this is the case.

The contact owns a 2020 Tesla Model 3. The contact stated while driving 75 mph with the cruise control activated, the vehicle experienced phantom braking. The vehicle was not diagnosed nor repaired by an independent mechanic or dealer. The manufacturer was made aware of the failure and informed the contact that a technician would inspect the vehicle at the residence. The failure mileage was 26,498.

Autopilot has repeatedly slowed down very quickly and suddenly on multiple occasions over the past year for no reason on a completely clear road. . Read more...

I was driving on a deserted highway on interstate 395 heading from la to mammoth lakes. There were no cars behind or in front of us. I first put the Tesla into auto steering mode, and things were fine for a while. Then I experienced "phantom braking" with no warning. The car started to brake on its own, and then I disengaged auto steer and drove manually. About 30 minutes later, I put the car into simple "cruise control" and things were fine for a while. Then again with no warning, the car started to hit the brakes. I disengaged the cruise control and took over again. In both cases, there was nothing around us. The weather was clear and sunny. This shouldn't be happening. There was a recent Tesla software update where Tesla apparently discontinued its use of 'radar" for the auto steer and is only relying on the car's cameras. I don't know if this is the cause of my recent phantom braking, but this is concerning to me as it is a safety problem especially if there were any cars behind me.

This vehicle has the phantom braking issue whether you are using adaptive cruise or autopilot, and has happened at least 15 times in the past two years. Because of the sudden braking, we almost had a collision with a semi-truck coming up behind us on I-5 heading south the last time and the driver thought I was brake-checking him, making him very angry and giving obscene gestures at us for it. We reported it to the Tesla service center, and they basically said it happens, and they disclosed it in the operator manual. That is unacceptable. This is very dangerous, and lives could be lost in the circumstance where someone is following close behind. Tesla basically is saying it can happen and there is no fix which absolutely unacceptable and this car is dangerous to drive.

Car randomly apply brakes when no obstacle present while auto pilot is engaged. Also gives a lot of false collision warnings.

The car has randomly braked multiple times, for no reason at all. Maybe shadows or mirages?.

This vehicle has frequent episodes of phantom braking at highway speeds. No obstacles, stop lights or other vehicles in proximity.

Unexpected phantom braking was experienced in this vehicle on a sunny day at mid day on I-30 going east through arlington. The car was operating on traffic aware cruise control. Travelling at approx 70mph the vehicle suddenly slowed very quickly below 50 mph before I interceded to resume control of the accelerator to resume my speed before I was rear ended. This occured as I was approaching an overpass in my middle lane.

Cars computer froze and I was stuck in cruise control. Hitting the brake would not disengage. Pressing up on the stalk would not disengage. I could manually slow/accelerate the car with the brake/accelerator but after letting off the car would continue on at that speed while everything else remains frozen. No turning signal function. I was afraid to attempt to stop the car fully as it would not disengage. Screen eventually went black and reset after what felt like forever. Functions returned to normal.

On 6/18/2022, nearly all visual based safety and convenience features of my car ceased to function randomly. I was given errors/warnings on the screen that cruise ("autopilot") control was unavailable and that automatic emergency braking was unavailable. I drove the vehicle manually to my destination, and after sitting overnight, it magically all worked again. Software on the car at the time was 2022. 16. 1. 1. I am filing this compliant because since obtaining this vehicle in March of 2022, the "autopilot" system has been a constant area of concern. Tesla really needs to get this system working, or perhaps be forced to reduce its functionality (like just have a normal speed based cruise?) until its ready.

On or about June 15, while driving my Teslai received a notification from my Tesla that the automatic emergency braking was disabled. There were also notifications that autosteer was unavailable, and so was cruise control. I made an appointment with a Tesla repair center for repairs to the car under warranty. My initial appointment was postponed to enable remote diagnosis. On July 6 I brought my car to a Tesla repair center. After looking at my car, Tesla informed me that the car had no then current alerts or faults. They "were able to confirm this is known firmware characteristic. Tesla is working to to resolve this in a future firmware update. " it's not clear to me what they are saying and whether this was a false positive from the firmware error reporting system or a transient fault that they could not reproduce. In any event, the fault reporting and the failure of Tesla to repair its firmware for a 2 and 1/2 year old car is a concern to me.

Autopilot regularly will panic brake (phantom brake) it also will often randomly change the set cruise control speed from 70 to 35 or from 75 to 35. This is a dangerous system that should not be allowed on the road.

When using the adaptive cruise control phantom breaking occurs. This is extremely dangerous because at times cruise is set to 60-75 mph and car will randomly hard brake. If someone was following me this could definitely cause an accident. It’s also so abrupt that it jolts your body forward. I have not taken the car to any service center to reproduce. There are no warnings, no indications of anything visually on the screen that the car would see to cause the breaking. There is also one spot on my route it consistently does this on. This issue has been occurring since early 2021. I take the same route daily for school drop off purposes. It’s a 45mi trip one way. The issue will consistently occur at least twice one way on the trip if I’m using the adaptive cruise system. I do not use auto pilot only the cruise.

The car exceeds the speed limit with adaptive cruise control/autopilot, despite all the available settings being set to strictly obey the speed limit. Driving on the highway in a 60mph zone enabling autopilot will set the speed to 60mph, as expected. If the speed limit increases, the car will change to the new speed limit, e. G. 70mph. Now, if the speed limit drops back down to 60, the car will not slow to 60, although the correct speed limit is displayed. Also happens on streets.

"phantom braking" issue is very real and very dangerous on my vehicle. Problem occurs while operating the car with autopilot engaged such that the adaptive cruise control is in operation. Problem happens with or without also having the auto-steer function engaged. Problem is that the vehicle will suddenly, very unexpectedly slam on the brakes. This can cause the driver of the vehicle to go into panic mode and for obvious reasons is also very dangerous for vehicles that are following the malfunctioning Tesla. Sometimes, this sudden, hard braking occurs when a vehicle coming toward the Tesla makes a left turn in front of the Tesla at a very far away and very safe distance - so safe that the driver of the Tesla is caught completely off guard when the Tesla decides to slam on the brakes. And cars behind the Tesla are also caught off guard. Other times, this "phantom braking" happens for no apparent reason at all - totally out of the blue. I am now very leery to use the autopilot feature, even though that was one of the vehicles biggest selling points. I am positive that only reason I have not been rear-ended is I have quick enough reflexes that I have been able to push my foot on the accelerator quickly enough to over-ride the sudden braking before the car behind me hit me. I have called Tesla's service department about this issue. They do acknowledge the issue, although in a vague manner as if they are reluctant to fully admit how prevalent and serious the issue is. I've asked if there are any adjustments I can make to the various settings that might reduce this problem. The representatives that I spoke with had only anecdotal experiences from conversations with other customers complaining about this problem. My Tesla has several control settings which could be related to this problem. They are not well explained in the owner's manual, plus some settings appear to overlap or conflict with similarly named settings. Confusing! many incidents, so is date is not specific.