2021 Tesla Model 3: false forward collision warnings

Filed Oct 24, 2026 · Driver assistance, Visibility · CA

Immediately following the installation of over-the-air software version 2026.32.3, the vehicle's center touchscreen lost all driving visualization capabilities. The backup camera now displays a black/non-responsive screen, removing federally mandated back-over protection. Additionally, the vehicle no longer provides active safety alerts, such as forward collision warnings or blind-spot obstructions, and driver-assist technologies (Autopilot) are entirely unavailable. Official Manufacturer Diagnosis: A physical diagnostic review of the vehicle's alert and signal history by Tesla Service confirmed an internal hardware communication failure directly induced by the software rollout. The official service logs state that the secondary Autopilot processor, designated as "Processor Turbo-B," has suffered a fatal fault and is failing to communicate. Tesla documentation acknowledges that this software-induced hardware lockup prevents the car from completing future software updates and has permanently disabled the safety vision suites. Current Vehicle Status: A subsequent physical replacement of the 12V low-voltage battery failed to resolve or clear the faults, confirming a permanent failure of the primary computing hardware. The manufacturer requires an out-of-pocket Car Computer replacement cost of $2,136.00 to restore federally mandated safety features that were operational prior to the manufacturer's software deployment. The vehicle is currently being operated without active safety overrides, emergency braking, or backup visibility.

Filed Sep 10, 2026 · Driver assistance · PA

Interior camera circuit failed in the main computer as diagnosed by Tesla, it disables most safety features of the car, no collision warning or avoidance, no automatic emergency breaking, no lane departure warning or correction, no reverse cam, no cruise control or self driving, and probably more. Only Tesla can replace it because it's vin matched to the car, for $2400. This part should be more durable

Filed Jun 12, 2026 · Acceleration, Brakes · TX

The forward-facing camera and Autopilot computer system on my 2021 Tesla Model 3 has failed. The dashboard first showed intermittent warnings that "Automatic Emergency Braking is currently unavailable" and "Adaptive headlight features are unavailable." Over several weeks the problem worsened from intermittent to constant, and the vehicle progressively lost its forward road visualization and all active safety features. Using the vehicle's Service Mode diagnostics, the Autopilot computer's Primary (A) processing node reports a "CRITICAL" status. The fault log records repeated alerts including dasMIA (driver-assistance system not responding), aebFault (automatic emergency braking fault), and fisheyeCamInitFault and fisheyeCameraStreamExit (forward camera initialization and stream failures). The cameras themselves are physically clean and unobstructed. Safety risk: the failure disables Automatic Emergency Braking and forward collision avoidance, lane-keeping/driver assistance, and the adaptive auto high-beam headlights. AEB is a critical crash-avoidance system; losing it leaves the vehicle unable to brake automatically for an imminent collision, and the loss of adaptive headlights reduces nighttime visibility. A Tesla service center inspected the vehicle, confirmed the diagnosis, and determined the Autopilot computer — a sealed, solid-state control unit — had failed and required full replacement at approximately $3,400. The vehicle is well under 50,000 miles. This failure appears consistent with the same car-computer power-component shorting failure for which Tesla issued a recall on its newer model-year vehicles. The vehicle and the failed component are available for inspection on request. The vehicle has not been inspected by police or insurance.

Filed May 13, 2026 · Driver assistance · PA

Component/System Failure: Total failure of the Autopilot ECU (DAS Computer) and the Front-End Module (FEM) wiring harness. Incident Description: My 2021 Tesla Model 3 (37,000 miles) experienced a catastrophic and "silent" failure of the entire vehicle vision suite and all active safety systems. A Tesla Service technician (Warrington, PA) inspected the vehicle and confirmed the root cause was a factory-defective (crimped) internal coaxial cable in the wiring harness. This manufacturing defect caused an electrical short that destroyed the primary safety-critical computer. Safety Risk: This failure resulted in a direct violation of FMVSS 111 (Rear Visibility), as the backup camera was rendered completely inoperable. Furthermore, all collision-avoidance features—including Automatic Emergency Braking (AEB), Forward Collision Warning, and Blind Spot Monitoring—were disabled. Critical Safety Concern (Silent Failure): The vehicle provided zero driver-facing alerts, dashboard warnings, or lamps to indicate that these safety systems were offline. I unknowingly operated a vehicle that was non-compliant with federal safety standards and lacked all primary crash-avoidance technology. The failure codes (APP_w045 and VCFRONT_a158) were only discoverable by manually entering the vehicle's "Service Mode." Manufacturer Status: Tesla Service has confirmed the hardware failure and the wiring defect but is currently refusing to cover the $2,800 repair cost, despite the failure involving systems currently under federal recall (SB-26-00-016). I am reporting this because a factory wiring defect causing a total, silent failure of federally manda

Filed Feb 20, 2026 · Driver assistance · MI

The rear camera malfunctions intermittently and causes other errors to happen, like Automatic emergency braking unavailable or forward collision warning unavailable. When the camera error happens, it says the camera is unavailable. I took my car to the Tesla dealership three times. The first time, they did a continuity check and said the harness was degraded, and they replaced the harness and the rear camera. A week later, it happened again. The second time they reset the camera calibration and it worked. The day after, it happened again. The car is at the Tesla dealership for the third time (02/20/2026).

Filed Dec 7, 2025 · Driver assistance, Electrical · AZ

Central computer (motherboard), cameras (front/rear/side), autopilot/auto steer system. Error code: APS_w132. Description of Problem: On or around [XXX], Tesla pushed a mandatory over-the-air software update to my vehicle. Immediately after, multiple safety-critical systems failed: all cameras (including backup) became intermittent or non-functional, auto steer/autopilot stopped working, and the car emitted constant distracting beeping alerts due to a critical motherboard failure. This made driving hazardous—impaired visibility for parking/reversing, loss of collision avoidance features, and constant audio distractions that could lead to accidents. I had to drive in this unsafe condition for weeks while waiting for service. Tesla attempted a remote fix but it failed. I scheduled service on November 19 for December 3 (19-day delay). Diagnostics confirmed the update induced the hardware failure, a known issue reported by other 2021 Model 3 owners on forums like Reddit (e.g., software bricking motherboards post-update). Despite this, Tesla refused warranty/goodwill coverage, quoting $2,576.83 for repairs. Service advisors Josh and Andy were unprofessional: Josh was rude/condescending; Andy was aggressive, sarcastic, and retaliatory. After I mentioned filing complaints with the AZ Attorney General and News Channel 3, Andy threatened $100/day storage fees with an impossible deadline (called at 4 PM Friday, close at 5 PM, demanded pickup by morning, then noon). He closed my ticket without authorization, delaying fixes and forcing me to contact another location—prolonging my exposure to the unsafe vehicle. This defect poses serious safety risks: sudden loss of cameras/autopilot could cause crashes. Tesla's awareness (from prior reports) and poor handling (intimidation delaying repairs) exacerbates the danger. No crash/injury yet, but potential is high. Please investigate this update-induced failure as a widespread defect. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Aug 18, 2025 · Driver assistance · CA · crash

Component/System involved: Advanced Driver Assistance Systems — FSD (Supervised)/Autosteer (Lane Keeping Assistance) and Adaptive Cruise Control. Possible failure to warn/stop (FCW/AEB). Vehicle and data are available for inspection upon request. I preserved dashcam files and requested Tesla to preserve engineering logs and EDR. What happened & safety risk: On [XXX] at ~[XXX] PDT on [XXX] near East Palo Alto, CA, with FSD (Supervised) engaged, the system appeared to misinterpret an exit ramp/gore area as a continuing lane at a highway fork and maintained ~60 mph (posted ~70). As soon as I saw the trajectory was unsafe, I braked and began manual steering takeover, but the vehicle contacted a roadside sign near the gore/shoulder before I could complete the maneuver. I then stopped safely. No other vehicles were struck. Airbags did not deploy. This posed a serious collision risk to me, my passenger, and nearby traffic. Reproduction/confirmation: NOT REPRODUCED. I have not attempted to reproduce the event. UNKNOWN whether the issue has been reproduced by Tesla or a service center yet. Inspection to date: Police responded (report pending). My insurer has opened a claim. I opened a Tesla Service request asking to PRESERVE Autopilot/FSD engineering logs for the incident window and to coordinate EDR extraction; engineering review pending. Vehicle remains drivable. Warnings or symptoms before failure: No audible/visual forward-collision warning was perceived by me and I did not observe automatic emergency braking. No prior warning lamps/messages were noticed before the departure toward the gore. UNKNOWN whether any internal/partial interventions were recorded in logs. Evidence available: Four-camera Tesla dashcam footage saved and backed up (see [XXX] ); precise time window ~[XXX] PDT on [XXX]. I can provide files and cooperate with data retrieval/inspection upon request. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jul 8, 2025 · Driver assistance · CA

While using traffic aware cruise control or autosteer, the car occasionally detects a nonexistent person in the center of the lane I’m driving in, the proceeds to slam on the brakes when no hazard exists. It seems that tire markings in the road and certain lighting conditions cause the car to think there is a person in the road. Additionally, when driving on a highway with rolling hills, the car detects a forward collision alert and hits the brakes and disengages the autosteer. Both of these could cause a rear and collision at highway speeds. The dealer has claimed that the cause is functionally normally and I already tried to get it serviced but the car continues to have these issues. I do have video evidence of the car slamming on the brakes and detecting a forward collision.

Filed Sep 5, 2024 · Driver assistance · GA

I started receiving messages that the cameras were occluded and that there was an error and ALL of my system safety features were disabled. No front forward collision warnings, no emergency braking available, nothing available and the system computer that showed all of the traffic and everything completely disappeared from the screen, the car has literally gone blind. All of this started happening on with the camera issues in May, but I thought that it was a software issue and would be addressed in the next update, although the critical disengagements were supposed to be sent to Tesla. I took the car to the service center on 9/4/24 at 9am, and they stated that the did a system test and saw that the triple camera was showing a fault and so they replaced the camera and gave it back to me the same day. Everything worked for the rest of that day for a service that took at least 3hours to figure out. Today after I get off of work at 1pm and I go to initiate FSD and I get 3miles from my residence( I live <8mi from my job) and the system disengages again asking me to take over and all of my critical systems have yet again been disabled. My whole safety is compromised at this point yet again. I immediately bring the car back and they tell me that it's going to take them an additional 30-45 mins to "diagnose" the issue although it's the same thing that's been happening that was supposedly fixed yesterday. After that wait time the service consultant comes back and tell me that the car is throwing all kinds of codes and that, "It's still safe to drive." When I told that it cannot be safe to drive if all of the critical systems were disabled he suggested that I take it and they can do a remote log pull so they can look more into the issue or I can leave it as the part that's needed needs to be ordered anyway. I don't know how they can order a part if they're claiming to not know what's wrong with it. Something else is going on that they don't want to take accountability for!

Filed May 1, 2024 · Brakes, Driver assistance · VA

Tesla ADAS detects non existent objects and issues collision alerts and phantom brakes randomly if there is no cars in front of the Tesla, braking abruptly and almost getting me into rear end accidents. Tesla ADAS freaks out when making lane changes randomly, shaking violently and giving the driver and its passengers a fishtailing simulation. Auto wiper triggers randomly while it's sunny, distracting the driver and forcing an interaction on the center console to stop it. Auto wiper cannot be turned off as it reengages upon using Tesla ADAS. The rear view camera lags. It stutters and shows me a delayed view. Compounded by the Model 3's very small rear view mirrors and side mirrors, this is incredibly dangerous as I have no way of gaining sufficient visibility of the back of the car. Tesla service told me this is all normal.

Filed Jan 5, 2024 · Driver assistance · MA

FSD Computer module (AP3 module) when starting to fail causes all active safety systems to top functioning, including but not limited to Lane Assistance, Automatic Emergency Breaking, Adaptive Cruise Control, Lane Departure Warning, Lane Keeping Assistance, Blind Spot Warning, Pre-collision systems, etc. This is due to the ECU that processes the video feeds from the cameras needed for these function begins to fail, and is not surprising. What is surprising is there are absolutely zero customer or service facing alerts for this issue. Customers simply are unable to manually activate some features, vehicle display has difficulty recognizing objects and lane markings, and the service menu (meant for vehicle service/repair) shows part of the ECU as critical in diagnostics, but does not provide an alert. I can only guess that as previously only half of the module was used at a time, with the second half being for redundancy incase of a failure on one part of the unit, still allowing for full functionality. However, in newer versions of the vehicles software both halfs of the module are used simultaneously to increase processing power, thus eliminating redundancy. It is possible that due to the past redundancy that a failure of one half of the unit was not considered a cause for alarm (though I would have hoped a failing component would have caused an alert, unless the companies hope was that one half would work long enough on its own until it no longer needed to be covered under warranty). However, given both processors and now being actively used there should definitely be alerts and warnings. In addition to losing the convenience of several of these systems there is also a negative safety aspect of systems such as accident avoidance, pre-collision seatbelt tensioning, and others may not work in a pending collision (not that I have seen these systems function properly in past collisions when the module was fully working).

Filed Oct 25, 2022 · Driver assistance · IN

In vehicle speaker system occasionally resets, keeping speakers from making noise during a 5-10 second window. This keeps in-vehicle chimes and collision warnings from sounding at appropriate volumes.