Tesla Model S lane assist problems

Filed Oct 25, 2026 · Brakes, Driver assistance · CA

While driving at freeway speed at about 9:15 PM with Full Self-Driving (Supervised) engaged, the car suddenly jerked and told me to take over. Several safety systems then failed at once: ABS disabled (ESP_a025), stability control disabled (DI_a222), traction control disabled (DI_a223), Automatic Emergency Braking unavailable (APP_w009), Vehicle Hold disabled (DI_a245, DI_a246), steering assist reduced (UI_a020), and lane departure avoidance unavailable (APP_w264). Steering became very heavy and regenerative braking stopped, so the car coasted freely and would only slow with the brake pedal. I exited the freeway and drove slowly home. The alerts stayed active after a reboot. The car was towed to the Tesla service center under warranty and is available for inspection. There were no warning signs before the failure. No crash or injury. This is the second event like this. In April 2026 the car showed safety fault alerts and, with automatic braking disabled, rolled forward twice at a red light. Tesla service reviewed the logs, called it a false sensor reading, and made no repair. A service advisor later acknowledged in writing that these were intermittent problems. My children ride in this car regularly. I no longer consider it safe to drive.

Filed May 12, 2026 · Brakes, Steering · FL

Tesla just sold me a car with defective front half shafts axles. The car makes a reproducible and very concerning accelerator pedal shudder that makes the entire vehicle front vibrate, including the steering wheel and brake pedals while the car is accelerating between 30-60mph. This interferes with safety features like, lane departure assistance and blind spot steering wheel feedback, Confusing the driver and creating a distracting scenario where an accident can happen. Upon bringing this to the attention of the service center in Fort Myers Florida, the service center manager took a drive test with me, and was able to replicate the issue, but immediately started dismissing it as "normal" and within Tesla specs. This is becoming a regular practice at that service center, where they deem warrantable issues as normal and within (their tolerance). I insisted that this issue is not to be taken likely by Tesla, because it is something that involves a safety hazard. Upon further research, I was able to find that this issue is happening to many Teslas model S and X, where the front axles bend due to the weight and high torque of the vehicles. The issue falls completely under warranty and the half shafts should be replaced, but apparently Tesla has instructed their service centers to dismiss and disregard the symptoms, and just tell the customers that no warranty replacement will occur, because it is not necessary, we just have to drive the cars like this, until the car completely fails, or an accident happens because one of the bent axle shafts breaks on a highway during normal drive. I recording this report as evidence that the issue has been reported to the highest vehicle safety authorities, and I expect a corrective action so Tesla can fix my car under the existing unexpired warranty.

Filed Mar 3, 2026 · Driver assistance · SD

multitude of electrical problems: Fuel/Propulsion System, Lighting, and body controls along with all ADAS: Adaptive Cruise Control, Automatic Emergency Braking, Blind Spot Warning, Forward Collision Warning, Lane Departure Warning, Lane Keeping Assistance systems are impacted by random intermittent glitching as computer screen bubbling progressed with goo leaking out of the bottom of the main computer. Most recent symptom was disabling of ALL ADAS systems along with automatic high beam headlight switching. Long ago as screen began to bubble and express fluid the low windshield washer alert came on and remains even when the tank is full. Then the charge port responsiveness degraded and stopped automatically functioning requiring user to bypass by clicking the "open charge port", then waiting 3 seconds, then tapping "unlock charge port". User must perform this as remote manual operation from a NACS charging handle button push will FAIL. Long ago the computer controlled 'home link' module would have excessive time delays on the order of hours or days from when the user would program and or operate the function. I even had a "phanthom" car appear by the computer calculations with E-Braking before the ADAS system failed fully, a 1.0 Tesla system should not have that... Windows have randomly rolled down and the driver side rear door will unlock and open on its own as the door handles present themselves. The safety risk class is unknown unknown; if the root problem is the screen filling leaking on electronics any number of unknown, unplanned, unstudied risk failure modes exist that can not be predicted. Schematically the HOMELINK is on connector X429 sharing CANBUS connections impacting safety: Driver "Instrument Cluster", DAS systems connected to "Power Steering ECU", "iBooster ECU", "ABS / Stability ECU", "Passive Restraints Controller"... see CAN Network - Chassis drawing page 11 , "Energy System - Charger Logic Connections" "Instrument Cluster / LIN" pg35

Filed Jan 13, 2026 · Driver assistance · CA

CRITICAL SAFETY FAILURE: Loss of Driver Override and Extreme HMI/Signaling Latency. 1. Loss of Override & Unintended Acceleration: While operating FSD (Supervised), the vehicle ignored a 65 mph set-point and accelerated to 80 mph. I attempted to reduce speed by pulling down on the steering stalk 4-5 times, but the vehicle ignored all manual inputs, requiring a hard disengagement. 2. Lane Departure / Path Failure: The vehicle failed to maintain lane centering, specifically crossing over the centerline into opposing traffic. This occured without warning or system-initiated steering alerts 3. False Signaling / Path Failure: I’ve seen at least two occurrences where system exhibits dangerous signaling conflicts, such as activating a right-turn signal while simultaneously executing a left-turn maneuver. One time it was on a 45–55 mph rural corridor where trailing drivers frequently overtake slower vehicles. A false right-turn signal acts as a dangerous "all-clear" for a trailing driver to pass on the left, creating a high- probability broadside collision scenario when the Tesla physically executes its left turn. I have no idea if this has occurred more than these two times as I don’t check this. The other time I caught on video, by chance, as I was trying to capture the surging behavior to show the Tesla service center 4. Audio & Visual HMI Latency: Audible instructions arrive 100+ feet after turns, and the map UI auto-zooms away from the driver’s focus, requiring constant manual screen contact to view street names. This forces significant Visual-Manual Distraction. 5. Confirmed Inadequacy: Tesla Service Invoice #[XXX] (Jan 27, 2025) documents: 'The current computer is a little too slow for full self driving function...' confirming the hardware is unfit for safety-critical processing. This incident is directly relevant to the federal safety agency Investigation PE25012. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Sep 16, 2025 · Driver assistance, Steering · NC

Sometimes while making ordinary and safe traffic maneuvers the Lane Departure Warning system sometimes emits a very loud, distracting, and startling emergency chime. In particular it does this while turning into parking garages or driveways, which are already high-workload moments with high likelihood of nearby pedestrians and other vulnerable road users.

Filed Sep 15, 2025 · Driver assistance · MD

Without prior incident or warning all ADAS systems stopped working, including adaptive cruise control, AP, FSD, automatic emergency breaking, blind spot warning, forward collision warning, lane departure warning, lane keeping assistance, parking collision warning. There were no alerts displayed on either driver’s display (other than ‘park assist unavailable’). Also there was no visualization of surrounding traffic, roads etc that is normally visible. The cameras were clean. Rebooting the MCU did not resolve the issues.

Filed Aug 24, 2025 · Electrical, Lights · NJ

Tesla originally confirmed issues with the MCU1 system in my vehicle and upgraded it to MCU2. I Paid $1,599 for the repair/upgrade. Since then, the center screen has continued shutting off while driving. When this happens, the instrument cluster and controls go dark, I cannot see my speed, use the blinkers to signal, operate the AC/defroster, or access other critical vehicle functions. This has occurred multiple times on highways, including US-22 in New Jersey, which created serious danger because I could not monitor speed or signal properly. Although Tesla addressed the MCU1 problem by upgrading me to MCU2, they told me afterward the vehicle was still “safe to drive,” despite the failures continuing. I believe this is unsafe because I lose visibility of all driving information and access to basic controls. Tesla now refuses to repair these ongoing problems. After I raised complaints about the severity of the issue, I was dismissed and mocked for my speech disability during phone calls, and Tesla placed me on a service restriction. As a result, I am unable to obtain further repairs for this safety defect. I am afraid to drive the car. No Adaptive Cruise Control, Automatic Emergency Braking, Blind Spot Warning, Forward Collision Warning, Lane Departure Warning, Lane Keeping Assistance, Parking Collision Warning, or Rear Cross Traffic Warning features were involved in this failure.

Filed Feb 23, 2025 · Driver assistance · SC

In July 2024 all the cameras on the Tesla Model S except the rear stopped working after a failed software update. This meant that all of the driver assistance systems as well as GPS, adaptive cruise control, blind spot monitoring, lane departure warning, forward collision warning etc stopped working. The lack of availability of this system meant that the car no longer had any advanced safety features that came with the car. It took many months for Tesla service to diagnose and fix the problem, which they identified as a failure of the Auto Pilot computer. After I was finally able to get an appointment with the Service center, they replaced the Autopilot computer at a cost of over $1500. The failure first appeared in July 2024. The symptom was GPS location being stuck and Autopilot and all safety features being not available.

Filed Dec 6, 2024 · Driver assistance · CA

10:12am 12/6/2024 autopilot randomly and suddenly starts jerking wheel back amd forth erratically and swerves all iver road onto wrong side of road. When i grab wheel to disengage it sounds alarms and alleges im departing my lane and activates lane departure/ assist despite the fact i have lane departure assist disabled

Filed Nov 18, 2024 · Driver assistance · CA

3:17pm nov 18 2024 - I was driving manually and pulled into my driveway and subsequently my garage. I had the blinker on. As I went to turn into the garage, I heard three beeps and no message was displayed on the screen. The vehicle also jerked the steering wheel towards the wall. I have all lane departure warnings, and assistance settings turned off.