2021 TESLA MODEL 3 Forward Collision Avoidance Adaptive Cruise Control Problems

Phantom braking events on most every type of road and drive when using cruise control, not autopilot or other automated systems. Standard cruise control is unusable and is a safety concern with constant warning alerts and automatic emergency braking when other vehicles pass by safely in the adjacent lane.

Constant “phantom braking” when using autopilot on the freeway and other roads. When the pavement changes color, the car slams on the brakes in the middle of the freeway. When a truck is in the opposing lane, the car slams on the brakes. When a truck is merging into a lane to my right on the freeway, the car slams on the brakes. This is extremely unsafe and frightening. This software is garbage and worse than my 6 year old Subaru. Tesla needs to address this, and I hope they’re eventually forced to.

We continue to have issues with Tesla's autopilot feature. The Model 3 with autopilot activated or just with the adaptive cruise control activated, will "phantom" brake for zero reason. Today, 12/14/2021, it happened three times within 90 minutes. All three times there was no reason for the car to make emergency actions. Once I had a truck with a trailer behind me, forcing them to brake hard to avoid hitting the rear of the car. I submitted a service request to Tesla and this is what they told me: Incidents like the one you are describing where the vehicle slowdowns for apparently no reason are generally caused by a few reason such as: Map data inaccuracy, Speed limit data inaccuracies, the vehicle reacting to an upcoming event, GPS position inaccuracies, and predicative driving anomalies. In all of these situations the computer is trying to make the safest determination of what...

On a daily basis while using the Adaptive Cruise Control or Tesla Autopilot, I will experience multiple erroneous automatic braking events. The car generally slams the brakes on when it is cresting a hill, attempting to pass a semi truck, or when sun angles produce large shadows in the road. The automatic braking events are sometimes very aggressive and can be extremely dangerous, especially if someone is following behind you in high speed traffic. My wife has requested that I don’t use cruise control or autopilot while she’s in the car, as we experienced an unwarranted, aggressive automatic braking episode which caused great pressure against her pregnant belly on a previous road trip. Additionally, the cameras on my vehicle will often produce warning/error messages stating “X camera is blocked or blinded” for absolutely no reason other than headlights from oncoming traffic shining into my lane. I am unsure if this...

My Tesla Model 3 is brand new and delivered in 2021, the vehicle has had no recalls or issues report by the manufacture and is running the latest software updates provided by Tesla, which as of this date is: 2021.36.8 I have driven the car since delivery a total of 5,596 miles, which includes a cross country road trip from CA to FL. During this trip I used "Autopilot" a feature which is touted as safe, however after my experience and reading and hearing other users reports I believe this is not the case. I had numerous cases of "phantom braking" which is where the vehicle believes there is an object that it will collide with and it slams the brakes on, usually dropping around ~20 MPH extremely rapidly. Many of these events occurred in lower light scenarios (night time) and almost all of them occurred when I had no...

Driving normally, with cruise control (not auto steering) engaged vehicle will spontaneously and dangerously apply emergency breaking. This happens regularly to the point I won’t use it. It’s going to cause accidents, especially when slippery conditions exist.

ADAS systems detect oncoming traffic from the opposing lane on single lane roads and sounds forward collision alarm. If using adaptive cruise control or Autopilot, vehicle will rapidly decelerate. This poses a risk to the occupants and vehicles behind from unexpected changes in speed, which could cause a rear-end accident. The issue can be repeated in the scenario described above. Forward Collision Warning alarm goes off when it sees a oncoming vehicle far off in the distance.

Vehicle will randomly have phantom braking and braking events when using adaptive cruise control. It happens more often when a vehicle has recently passed and it 150+ feet in front of the vehicle. This poses a safety risk for vehicles behind as the car will randomly slow down. The adaptive function becomes unusable.

Terrible phantom braking. On a road trip, flat straight open roads, little to no traffic in front of me, and consistent full on hard braking from 75mph down to 35mph in a split second. Multiple times and so consistent I had to stop using the cruise control completely. This never happened like this in my day to day city driving. But as is, the cruise control is nerve wracking and dangerous. Thankfully no cars behind me because it could very easily cause a serious and deadly accident.

Recurrent, frequent, and unpredictable sudden braking while vehicle is being driven in TACC (Traffic Aware Cruise Control). These event, or "phantom brakes", occur when there is no visible obstruction ahead of the car (i.e. crossing vehicle or object), nor any environmental explanation (sun glare, heavy rain, etc.). Events occur in all conditions, including daytime, clear sky, with or without traffic. Frequently the collision warning will sound during these events. Given the episodes occur during highway driving, the unexpected hard braking is a set-up for being rear ended by cars behind me. These events are most common on 2 lane divided highways, and can occur as frequently as every 2-5 minutes. Brought in for evaluation at Tesla service center, and they refused to acknowledge any problem, stating the car is "operating as designed." This was based on the fact that they did not reproduce symptoms on their test drive. Although I...

Whenever TACC (cruise control) is engaged and the car is on a two lane highway with no divider, it will aggressively brake and trigger the collision warning system when a semi-truck passes going the opposite direction.

While using autopilot feature on interstate highway the vehicle independently applied braking while traveling at 70 mph although no other vehicle nor any other physical object was observed. Also while using the same feature and traveling on a two lane highway at 55 mph the car independently applied braking when an large truck approached in the opposite on-coming lane. This exact event happened a second time when another large truck while traveling the same two lane highway. Autopilot was no longer used.

The “traffic aware cruise control” feature is flawed to the point of being unusable add dangerous. My Model 3 (leased in late September 2021) exhibits very frequent “phantom braking” problems when TACC is active. Some are mild, the car applying the brakes and slowing down despite the absence of nearby cars or hazards. Some are dramatic, the car slamming on its brakes and sounding an alarm — again, with no hazards. I have a service appointment scheduled for Dec 3 but I’m not optimistic.

For the past week, my car phantom braked with no obvious danger from a parked car. It just happens on a city road, not a freeway. Ithappened about 4 times

TRAFFIC AWARE CRUISE CONTROL WHILE CRUISE CONTROL IS OPERATING, DRIVING AT 70 MPH OR HIGHER, FOR NO APPARENT REASON, NO VEHICLES AHEAD OF ME, THE CAR BRAKES SUDDENLY. THIS HAPPENED AT LEAST SIX TIMES ON A 1000 MILE TRIP. IF A CAR HAD BEEN FOLLOWING TOO CLOSELY, MY SUDDEN BRAKING COULD HAVE CAUSED AN ACCIDENT. I HAVE NOT FIGURED OUT HOW TO CONTACT TESLA ABOUT THIS. NO ONE HAS INSPECTED MY CAR. THERE WERE NO WARNING SIGNS. AFTER I GOT HOME, I GOOGLED THE PROBLEM AND SAW THAT OTHERS HAD EXPERIENCED IT TOO. I'M WRITING IN THE HOPE THAT YOU WILL TELL TESLA TO FIX THE PROBLEM, OR AT LEAST TO OFFER THEIR CUSTOMERS PLAIN CRUISE CONTROL WITHOUT THE TRAFFIC AWARE FEATURE. THIS HAPPENED EVERY TIME I WAS ON THE INTERSTATE FOR MORE THAN A COUPLE HOURS, MOST RECENTLY ON OCTOBER 31, 2021.

Traffic Aware Cruise Control in the 2021 Model 3 is down right dangerous. Constant random braking for no reason at all. Happens multiple times if I use TACC on 2 lane roads. Happens nearly every time I use TACC on a 4 lane road. If I have traffic behind me I cannot use TACC at all for fear I would be rear ended.

While driving on C-470 westbound going 70 MPH with the car on Autopilot, the car braked hard dropping the speed to 40 MPH. If a car would have been behind me, they would have hit the back of my car. This issue is happening frequently, from neighborhood side streets, city streets, and on the interstate highway.

Starting in June 2021, Tesla removed the radar sensing on their vehicles and switched to a vision-only (camera) system for adaptive cruise control and "auto pilot" operation. On my 2021 Model 3 Performance, I can not use either system without constant "phantom braking" events. Sometimes it will only gently pulse the brake pedal, but often it is very hard braking along with a beep and message on-screen saying I need to take immediate control of the car. This happens daily and is not hard to reproduce. If there is a car behind you, it can be quite dangerous. Even if they don't rear end you, often it will cause them to think you're doing a "brake check" and can lead to road rage incidents. My previous car (a 2018 Model 3 RWD) had a radar sensor and experienced mild (not hard) phantom braking roughly 2~3 times over an 18 month...

I have been experiencing very frequent adaptive cruise control breaking for no reason. It is getting worse with every software update. It seems like the car is very scared of oncoming traffic and will hit the breaks or slow down for no reason. Sometimes there will be no traffic at all and it happens. If a car is following closely I’m afraid I will be hit. I wish I could turn off adaptive cruise control but there is no option. This is a serious safety issue.

When driving using the traffic aware cruise control, the vehicle experiences frequent abrupt and random rapid deceleration. This causes a safety issue when other vehicles are behind due to the rapid change in speed. Occasionally the vehicle will produce a forward collision warning with nothing in the path of the vehicle. This makes the cruise control function less usable and no option to disable the adaptive function.

Car hits the brakes and activates the emergency braking and forward collision warning very frequently (10+ instances during a 1 hr drive) in instances that absolutely do not warrant it (no obstacles or cars in the lane of traffic). Product is unsafe in the condition that it is in, and car offers no way to revert to standard cruise control. This type of automatic behavior could cause accidents.

My vehicle is a "Tesla Vision Only" (non-radar) Model 3 on firmware 2021.32.21 although this issue occurred on other firmware I've used as well. At night the car will very very frequently brake 3-10 miles an hour for no reason. It's specifically bad at night. It regularly thinks the ongoing traffic is headed in my lane. It regularly slows me down significantly before the top of a hill. Sometimes this can happen 3-5 times in succession within 5 minutes and causes other drivers to react to my vehicle as if it were dangerous. My only recourse is to tap the accelerator as quickly as I can to override the braking or not use the cruise control. This happens mostly on two lane two way traffic roads, often with gentle curves, and worst at night. I now have a car without even "dumb" cruise control. This is not what you think...

The vehicle will suddenly brake with no discernible obstacles when advanced cruise control is engaged. We experienced multiple “phantom braking” events during an 800+ mile road trip (round trip) last week, which was so frequent and unpredictable that autopilot and autosteer (Tesla’s terms) are unsafe to use. The first half of our trip was on two-lane highways and the car would brake heavily on clear roads and triggered two emergency accident avoidance events when large pickups were approaching in the opposite lane (screen showed a vehicle in red in our lane, audible alarms + heavy braking). The braking was so sudden that we were almost rear ended twice. We chose a different route to return home on a divided interstate, hoping that the TACC system would work. It did not. The car would brake dramatically when we went over a small rise, there was a vehicle in our lane at...

Tesla: 2021 Model 3 (Standard w/Full Self-Driving Capability) Vehicle Safety Issues as of August 09, 2021: 1. Vehicle does not have interior rear manual door release to allow rear seat occupants to escape in case(s) of emergency or vehicle electrical power failure 2. Vehicle does not have an exterior manual release for all doors in order to allow first responders the ability to assist or rescue vehicle occupants and/or driver 3. Vehicle doe not provide regenerative charging of 12V batter used as the only primary source of power to operate all Onboard Computer and Diagnostics, as well as electronics 4. Vehicle does not provide redundancy to operate Onboard Computer and Diagnostics or to maintain the electronics in order to allow vehicle to keep satellite contact or radio beacon 5. Vehicle does not have a mechanical locking system and is unable to be opened in the event of failure of the...

Automatic cruise control (autopilot) has twice failed to decrease speed when it should have. The vehicle will also brake at a moderate to high rate on the highway with zero warning or message, with no obstacle or vehicle on the road, creating a dangerous situation with following vehicles. ACC also requires the use of automatic wipers and automatic high beams, both of which activate at random times and thus encourage their disuse (e.g. sunny clear day, or with obvious traffic in front of the vehicle, respectively). Automatic high beams turning on and flashing when they shouldn't is unsafe for other drivers. Finally, the use automatic wipers and high beams is not listed as a requirement for active safety features such as FCW and AEB to function. However, these two critical safety systems rely on the same camera array and systems with problematic functionality described above. It's hard to believe that...