2018 Tesla Model 3: false forward collision warnings

Filed Oct 27, 2026 · Driver assistance · TX

Following Tesla's over-the-air deployment of FSD 14.1 Lite, the HW3 Autopilot computer in my 2018 Tesla Model 3 failed. FSD / Autopilot worked normally before the update and stopped working immediately afterward. Tesla Service diagnosed the vehicle XXX and verified the alerts APP_W207, APP_W462, APS_W182, APS_W188 and APS_W185. The technician attempted hard and soft resets and a firmware reinstall, and verified power and ground to the car computer. All attempts failed. The technician's notes state the secondary autopilot processor is no longer communicating and "a new car computer is needed." The failure has disabled Automatic Emergency Braking, Forward Collision Warning and Lane Departure Warning, as well as FSD / Autopilot. Tesla denied a goodwill replacement in writing on XXX, stating there was no evidence linking the failure to a software update, after the technician confirmed the computer had failed. Tesla provided a written estimate for the replacement of $2,616.37 total (invoice dated XXX). I have not authorized the repair. Tesla also confirmed in writing that my vehicle is not currently eligible for the HW4 upgrade. I sent a formal Notice of Dispute to Tesla at [XXX] on XXX and received no response; I sent a follow-up on XXX. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Aug 16, 2026 · Driver assistance · MA

After Tesla pushed software update 2026.20.6.11 or “FSD 14 lite” the self driving feature stopped functioning. Also all of the driver assistance safety features stopped working at the same time, forward collision warning, emergency braking, lane keeping assist, adaptive cruise control, blind spot detection have all stopped working as well. It appears one of the two “self Driving” ECU was damaged or disabled by the update. Without these features the drive is not notified in advance of a collision and the emergency braking does not function to stop the car. The car is awaiting inspection and repair by the manufacturer.

Filed Feb 7, 2026 · Driver assistance, Electrical · FL

Description of the Defect: While driving with Full Self-Driving (FSD) engaged, the vehicle's primary computer shuts down and reboots, causing a sudden loss of all safety features, including Blind Spot Monitoring, Lane Departure Warning, Forward Collision Warning, and the driving visualization. The cameras go black while the vehicle is in motion. The Trigger: The failure is triggered by high electrical load. If the Cabin Heater (HVAC) and Seat Heaters are active while FSD is fully computing, the 12V power supply to the computer drops below critical voltage, causing a "Turbo A" processor lockup and system crash. Evidence of Defect: Service Center diagnostics confirmed the specific error code APS_w169_TurboA_SCS_LKUP (Computer Crash) occurred at the exact same timestamp as VCLEFT_a302_blowerGeneralFault (HVAC Blower Failure). This proves a common-mode voltage drop affecting multiple critical systems simultaneously. Manufacturer Response: The manufacturer (Tesla) acknowledged the logs but refused to inspect the wiring harness or ground connections, instead recommending a replacement of the computer unit. However, the failure can be mitigated by unplugging external cameras to reduce load, proving the root cause is an insufficient power delivery design (Wiring/Grounding) rather than a component failure. The computer is running at full load with the newest FSD software and it can no longer keep up with additional loads. Safety Risk: This defect causes a sudden, uncommanded loss of driver assistance and situational awareness tools (cameras/visualization) while the vehicle is maneuvering in traffic. The vehicle’s power distribution system appears insufficient to support the electrical load of the software (FSD) and the hardware (HVAC) simultaneously.

Filed May 26, 2024 · Driver assistance · FL · crash

I may have figured out the common link between Tesla Autopilot crashes. Distracted operators have the accelerator pressed while the TACC is engaged, thinking (for many reasons) that the vehicle will stop if there are any obstacles in front of them. However, when the accelerator is being pressed, the vehicle will not stop. It will happily run into a wall. One second before impact, the forward collision warning turns on, followed by the ABS and the slamming of the brakes, but by then it's too late for a distracted driver. The raw Tesla "Vehicle Data" on Column D, shows "Accelerator Pedal Position (%)." I strongly encourage you to take a look at the data for the autopilot crashes and review this column to see how many had the accelerator pressed until 1 second before the accident, even if the autopilot was engaged. The 4/25/24 update to Investigation EA22002 states that in 82% of the crashes, the operator did not apply the brake until <1 second prior to impact. Tesla's Director of Autopilot Software Ashok Elluswamy also made a claim that the vehicle can switch pedals if the accelerator is pressed instead of the brake, and that technology saves 40,000 crashes per year: [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Apr 22, 2024 · Driver assistance · CO

Following an over-the-air software update, all audio in the vehicle stops working. This includes entertainment services, but more importantly turn signal indicator "clicks", forward collision warnings, parking assist chimes, shift confirmation and warning chimes, and various ADAS notification sounds. In some instances, the problem corrected itself within 24 hours. In another instance, it persisted for nearly a week before I discovered that unplugging the USB cable for the dashcam fixed the problem. The dashcam hard drive has been installed for over 4 years, per the instructions in the user manual, without problems until early 2024. There were no error notifications or anything else to indicate that there was a problem with the car's safety systems, or what the cause of the problem was, except for the lack of audio. I chatted with Tesla service about the issue. After discovering and sharing that disconnecting the USB drive fixed the issue, they were persistent in wanting to cancel my appointment without gathering any additional information. Here is the transcript of our interaction: Me: Unplugging my dascham hard drive from the USB port fixed it. Weird. Tesla: Oh interesting. Good to know! Do we have permission to cancel this appointment? Me: Since it keeps happening I'd like to keep it open. I turned on remote debugging in case that helps you to report the bug or something. Tesla: We have nothing else to diagnose if your vehicle is operating as expected. Me: Ok. If it keeps happening I will still want to bring it in, so let's keep the appointment. And I wouldn't say it's operating as expected. Having to disconnect USB cable to get the turn signal to work properly isn't what I would expect. Tesla: I would hate for you to bring in your car, only for us to tell you that it is because of your third party accessory, and we charge you for the diagnostic time. Me: I appreciate your concern.

Filed Oct 19, 2023 · Driver assistance · 27,000 miles · TX

The contact owns a 2018 Tesla Model 3. The contact stated that while driving at various highway speeds with the Forward Collision Avoidance Adaptive Cruise Control activated, the vehicle experienced phantom braking, causing the vehicle to stop abruptly in the middle of the highway. The contact stated that the failure had occurred on four separate occasions. The cause of the failure was not yet determined. The manufacturer and local dealer were notified of the failure, but no assistance was provided. The failure mileage was 27,000.

Filed Oct 12, 2023 · Driver assistance · MD

while driving my Tesla Model 3, using the ACC and self-steering option, I occasionally get "forward collision warnings" when going over a hill, where you can't see the road until you get over the hill. I have also had the same "forward collision warnings" on a flat stretch of road when there is clearly nothing in front of me in my lane. I have also been experiencing "phantom braking" episodes, noticing a pattern where they will happen as I approach a bridge overpass, as if the car thought the bridge overpass was perhaps an obstacle. These occur on a fairly regular basis, as in, at least 5-10 times per month. I drive a lot of highways, and drive approx 20,000 miles per year

Filed Feb 21, 2023 · Driver assistance · 99,000 miles · CA

The contact owns a 2018 Tesla Model 3. The contact stated while driving 65 MPH, the contact attempted to activate the Autonomous Self Driving feature; however, there was a message stating that the Forward Collision Avoidance: Adaptive Cruise Control inoperable was unavailable. The vehicle was taken to the dealer for diagnosis and the dealer stated that an unstated computer needed to be replaced due to overheating. The vehicle was not repaired. The manufacturer was contacted and stated that the vehicle was not under recall, and that the Warranty had expired. The failure mileage was 99,000.

Filed Feb 20, 2023 · Driver assistance, Electrical · CA

This is a report of suddent unintended acceleration on a 2018 Model 3 performance with 47,800 miles on the odometer - the first known occurrence on this car. At 50% state of charge, I drove the Tesla on a 10 minute trip and pulled into an underground parking garage with 3 lanes of valet parking. At about 5-10 MPH, the forward collision warning came on as I was driving towards the cones and stop sign. I brought the vehicle to a full stop with the friction brakes (not regenerative braking, which was set to LOW). The drive mode was set to HOLD, which lets the car roll forward but not backwards and doesn't CREEP when foot is off the brake. About 15-30 seconds after coming to a complete stop, my foot was hovering over the brake with maybe slight pressure up to 5%. The car suddenly lurched forward with wide open throttle type acceleration. It has over 450 electric horsepower from 2 motors. The car moved between 2 feet and 5 feet. My passenger noticed and asked what I did, if anything. I did not ever once touch the accelerator. Since my foot was on the brake pedal but not pushing hard on it, I was able to depress it with my foot and stop the car. There was a concrete wall perhaps 25 feet in front of the car. No people were in the front of the car. I was at the stop sign in the garage where valet takes over. I do not know if the car would have kept accelerating if I wasn't able to engage the brakes hard.

Filed Jun 4, 2022 · Brakes, Driver assistance · DE

I received access to Tesla’s Full Self-Driving system in late 2021. In the lead-up to that access, Tesla used a series of driver scoring metrics to select which users would get access first. Consistently, my metrics for forward collision warnings would show as alarmingly high, despite never coming within remote striking distance of another vehicle. On more than one occasion, a vehicle passing in other lane or turning left but in the other lane tripped the warning. At the time this registered as a red flag but more a bug of the evaluation system than the car’s recognition software. As time with the FSD suite has gone on, and subsequently with every new update, the phantom braking problem a number of users have described has plagued my experiences. Numerous times I’ve been driving with FSD engaged on two lane roads with no cars, shadows, animals or distractions of any kind around only for the car to suddenly and rapidly decelerate. Additionally I’ve received warnings repeatedly, without explanation, that the emergency braking system is disabling itself, then the warning will clear without any indication it’s either become reactive or is still disabled. Further, I’ve noticed through the new blind spot camera feature Tesla has released that my left rear-facing repeater camera can be blinded by the flashing of the embedded turn signal in the housing - but only the left signal, the right is not. This has led to, on more than one occasion, FSD disabling itself while active with little or no warning. I’ve listed the approximate date the first phantom braking occurred, but all of these problems have been an ongoing issues for months.

Filed Mar 4, 2022 · Driver assistance · MI

My car is equipped with forward-facing radar, but ever since Tesla turned it off in favor of "Tesla Vision" my Autopilot/TACC experience has been greatly worsened. The car suddenly (and very unsettlingly) slams on the brakes on the highway or city traffic (I have FSD Beta) for anything from shadows, to hills/inclines, to curves, or minor harmless debris (shopping bags) in the road. This has not yet caused an accident but has almost come close. Other issues: - FSD Beta, when engaged, forces the computer to have control over the high-beams and windshield wipers. The car obsessively flashes the high beams whenever possible, including on well-lit city streets. On multiple occasions this has triggered road rage in surrounding drivers because they think I'm flashing my brights at them for no reason. There is no reason to engage the brights in a well-lit urban environment. - Forward Collision Warning has become completely unreliable and routinely warns for cars that are not in my lane or in front of my car directly. This makes me more likely to just ignore the warning.

Filed Feb 23, 2022 · Acceleration, Brakes · GA

regularly experience phantom breaking and unwarranted early collision warnings