2021 Tesla Model Y Driver assistance Problems

Separately, the system could not hold a consistent speed on open highway with no vehicle ahead. It would surge from a set 70 mph to roughly 72-73 mph and then drop back, repeatedly, producing a pulsing acceleration and deceleration. The system also hesitated frequently and issued repeated audible alerts without an identifiable hazard present. I previously filed a complaint regarding phantom braking on this same vehicle (ODI number 11450326, filed February 4, 2022), which described nearly identical behavior triggered by trucks on the same Georgia-to-New Jersey route. That complaint concerned FSD/Autopilot software from 2022. The behavior described here occurs on Tesla’s current v14 Lite software released to Hardware 3 vehicles in July 2026. The defect has persisted across more than four years and multiple software generations. Unexpected hard braking at highway speed with no hazard present creates a rear-end collision risk to my vehicle and to following traffic.

NHTSA ID

11755578

Incident

Aug 1, 2026

On June 7, 2026, my 2021 Tesla Model Y with approximately 37,131 miles became completely unresponsive and could not be driven. Tesla Mobile Service replaced the 12V low-voltage battery on June 11, 2026. The official repair notes stated that the battery was replaced, proper operation was verified, there were no active alerts, and the vehicle was in excellent condition. Shortly after this repair, multiple vehicle systems stopped functioning, including all cameras, navigation/GPS, and software/firmware updates. Tesla Service later diagnosed the vehicle as requiring replacement of the HW3 vehicle computer at a cost of approximately $3,066. The loss of camera functionality disabled or affected multiple driver assistance features that rely on the camera system. The vehicle has been unavailable for approximately one month while awaiting repair. During discussions with Tesla Service regarding the diagnosis, I was informed verbally by the Service Manager that they see similar HW3 computer-related issues on a regular basis (approximately every other week). I cannot independently verify that statement, but I am including it because it contributed to my concern that this may not be an isolated incident. I am not asserting the root cause of the failure. I am submitting this complaint because the loss of the vehicle’s camera system and related driver assistance functionality may represent a potential safety concern, and I believe NHTSA should be aware of this incident.

NHTSA ID

11754296

Incident

Jun 7, 2026

My car is having issues with downloading the software and installing it. It usually happens during the summer. 2025 summer i booked an appointment and visited the Tesla Service center. They diagnosed and told me the ECU is having trouble and need to replace same. Its cost around USD 4K. My car faced this issue right after the warranty is over. First the High Voltage batter died next day the warranty got over, but they replaced it under Battery Warranty. But ECU issue they want me to pay for the same. Its a huge cost and i do see lot of customers keep complaining about the same/similar issues all over internet. It looks like a wide spread issue which Tesla ECU fail after the warranty get over. Biggest challenge for the customers are, No Navigation, GPS is not working, All the cameras goes blind, Lane assistant doesn't work. dashcam recording doesn't work. Technically we can just charge the car and drive. No safety features work as expected.

NHTSA ID

11751688

Incident

Jul 1, 2025

Error ui_a020 "steering assist reduced" appears without any noticeable steering changes at the moment, but with a warning that steering may become increasingly harder and harder. There were recent recalls on other models of Tesla.

NHTSA ID

11749310

Incident

Jun 30, 2026

Safety features on vehicle stopped working after software update was pushed to my vehicle. GPS, all cameras including backup camera and ones used for blind spots, and cruise control have all stopped working. Time displays incorrectly due to GPS issue and night mode stays on so rear view & back window stay dark making it hard to see other vehicles around me during the day. I’ve followed all recommended steps to resolve and issue persists.

NHTSA ID

11748415

Incident

Jul 2, 2026

Tesla model y is experiencing a front passenger airbag sensor failure (OCS) covered by factory bulletin SB-23-20-002 alongside TMPS and EAEB alerts. Tesla corporate resolutions is refusing to fix these safety system failures with out charging $1400 out-of-pocket, citing warranty expired.

NHTSA ID

11747298

Incident

Jun 1, 2026

The steering is not functioning properly. This is sealed system and no where else I can get it. This a safety issue and I haven't seen any car steering failing like this. Even cars as old as 20 year has no such issues. This is huge slap on of $3k+ on consumer. The cars is hardly 5 year old.

NHTSA ID

11744920

Incident

Jun 12, 2026

* What component or system failed or malfunctioned, and is it available for inspection upon request? FSD. It is available upon request. * How was your safety or the safety of others put at risk? Over the course of the last two months since the last FSD update (currently on v12.6.4), at least 20 times the vehicle has not properly stayed in the lane under certain circumstances listed below. These circumstances are always the same and it is repeatable and dangerous as the vehicle would have crashed into the center median if I had not intervened. Repeatable conditions: * 79 MPH * Low curvature highway at highway speeds when turning to the right only. * FSD version 12.6.4 with software version 2026.14.6 is engaged and in Assertive mode. * Has the problem been reproduced or confirmed by a dealer or independent service center? Tesla wanted $1k in order to reproduce and diagnose the problem, so I declined. * Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Same as above; Tesla wanted $1k in order to reproduce and diagnose the problem, so I declined. * Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? None of the safety systems fired, including lane departure warning or steering correction. FSD would not have veered out of the way of the median.

NHTSA ID

11744560

Incident

Jun 1, 2026

I am submitting this complaint to request an investigation into a serious safety defect involving my Tesla vehicle. On multiple occasions, the vehicle has experienced a significant and unexpected loss of acceleration when I attempted to enter or cross intersections. Despite pressing the accelerator, the vehicle failed to respond as expected, leaving me unable to accelerate normally while entering active traffic. This is not a minor hesitation or inconvenience. It is a serious roadway safety hazard. Drivers rely on immediate acceleration when crossing intersections, turning across traffic, or merging. A vehicle that unexpectedly limits acceleration can place occupants directly in the path of oncoming vehicles, creating a substantial risk of a severe collision, serious injury, or death. I reported this issue to Tesla Service and provided multiple timestamps documenting the events. Tesla was unable to identify any fault codes or provide a diagnosis and indicated that because no fault was recorded, the issue could not be confirmed. Through independent research, I found numerous reports from other Tesla owners describing substantially similar acceleration limitation events. Many reports specifically reference Obstacle Aware Acceleration as a possible cause, and some owners report that disabling the feature resolved the issue. If a safety system can falsely detect an obstacle and reduce acceleration while a driver is actively entering an intersection, the system itself may create a greater danger than the one it is designed to prevent. I respectfully request that NHTSA investigate whether Tesla vehicles are experiencing unexpected acceleration limitation or torque reduction during intersection entry and traffic merging situations, evaluate the role of Obstacle Aware Acceleration and related software systems, determine whether a broader pattern exists, and assess whether corrective action or a recall is warranted. This could cause serious injury or fatal crash

NHTSA ID

11743088

Incident

Jun 6, 2026

A 2021 Tesla Model Y experienced steering/suspension warnings followed shortly by a steering-assist reduction event. On or around May 21, 2026, the vehicle displayed: “Steering alignment service recommended — OK to drive, schedule service soon.” The vehicle was brought to Tesla because the owner was concerned the car had detected a steering, alignment, suspension, or safety-related condition. The Tesla invoice from that visit appears inconsistent. It states that “a wheel alignment check was completed,” but also states “No Labor Performed — Customer Did Not Authorize Repairs or Inspection,” with 0.00 labor hours and no charge. A documented steering/suspension diagnostic inspection, alignment report, alert-log review, or safety assessment was not performed by Tesla or inspected. The owner was advised to replace tires and return later. Approximately 90 miles later, during a low-speed three-point turn, the vehicle made a loud pop/clunk from the front area and displayed: “Steering assist reduced — Steering may require increased effort.” A related alert also stated Lane Departure Avoidance features were unavailable. This created a safety concern because steering effort may unexpectedly increase during low-speed turns or parking maneuvers. Tesla later inspected the vehicle and documented torn front lower lateral/compliance link bushings and vehicle log data showing steering gear alerts. Tesla replaced the front lower lateral links and front lower compliance links and performed alignment work. After those repairs, Tesla stated a steering gear alert was still present and recommended steering gear/steering rack replacement with additional alignment work. The concern is that a steering/alignment warning occurred shortly before the physical front-end failure and reduced steering-assist event, but the earlier Tesla visit does not clearly document that the warning was meaningfully inspected or safety-assessed. Vehicle is currently unsafe to drive and is in Teslas possession

NHTSA ID

11742463

Incident

May 21, 2026

The vehicle’s secondary Autopilot Processor / car computer is internally faulted and stuck in a continuous wake/shutdown loop. This causes severe standby battery drain (~20 miles of range lost per day while parked) and completely prevents all over-the-air software updates - including federally mandated safety recall remedies. On April 4, 2024, Tesla Service diagnosed the fault and linked it to the drain and inability to update. On the same visit, Tesla added two safety recalls (23V-838 Autosteer controls and 24V-051 Brake/Park/ABS indicators) to the work order. They then demanded ~$3,000 customer payment for computer replacement before the recalls could be performed. After I declined the paid repair, Tesla marked both recalls as “completed” via software update despite the same invoice stating the vehicle could not receive updates and remained on software version 2023.38.9 (which predates both remedy firmwares they claimed was installed). Tesla is effectively paywalling federally required safety recall remedies by requiring the customer to first pay for computer replacement first. Two additional recalls remain open (21V-389 seat belt fasteners and 24V-554 hood latch). The problem has been confirmed and documented multiple times by Tesla Service.

NHTSA ID

11742219

Incident

Apr 2, 2024

Even after the recent recall for backup camera freezing, my backup camera froze again today. I took the car in, in the past, to report the problem and was told to reset the computer even after the technician witnessed the problem. Got charged $300 so haven't been back. Problem has been there for a couple of years. I had hoped the software update would fix it but no such luck.

NHTSA ID

11741705

Incident

Jun 1, 2026

Phantom brake incident today,5/26/26. Traveling 35mph, brakes slammed on for no apparent reason. Seatbelt tightened and my head launched forward. Neck is very strained.

NHTSA ID

11740161

Incident

May 26, 2026

I am reporting two unresolved safety-related defects on my 2021 Tesla Model Y (VIN: [XXX] ) that occurred following paid service at Tesla's League City Service Center on 04/16/2026 DEFECT 1 — COMPUTER AND SENSOR SYSTEM FAILURE: The vehicle's onboard computer cuts in and out intermittently. Sensors fail during operation and the problem worsens significantly in high-temperature conditions. Tesla vehicles rely on their computer and sensor systems for core safety functions including collision avoidance, autopilot, and driver assist features. Intermittent failure of these systems while operating the vehicle is a safety hazard to the driver and the public. DEFECT 2 — GLOVE BOX INOPERABLE: The glove box does not open following Tesla service. The glove box in Tesla vehicles houses key vehicle documentation and is integrated into the vehicle's locking and security system. I paid $2,497.50 for service on [06/16/2026]. Both defects were either caused or left unresolved by that service. I have notified Tesla service staff directly and followed up multiple times over more than four weeks. Tesla has not responded, has not scheduled any repair, and has not refunded my money. I am filing this complaint because (1) the sensor and computer failures present an active safety risk during operation, (2) Tesla has ignored all attempts to resolve this, and (3) public reviews indicate this is a pattern affecting multiple consumers. I request that NHTSA investigate and determine whether a safety defect investigation or recall is warranted. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11738762

Incident

Apr 16, 2026

My 2021 Tesla Model Y HW3 experienced complete failure of all cameras, GPS, Automatic Emergency Braking, and Adaptive Cruise Control following the installation of software update 2026.8.6.1 — the OTA remedy update issued by Tesla for NHTSA Recall 26V283000. The vehicle was fully functional prior to this update. The failure was confirmed and reproduced by Tesla's authorized service center. The service advisor confirmed in writing: "During the update, the computer failed to reboot properly. We attempted to perform a 12V reset but unfortunately it is still stuck in the boot loop state." The Autopilot ECU (Primary/Turbo A) is stuck in a permanent boot loop and cannot be recovered by software means. Safety impact: All cameras including rearview camera are completely non-functional. Automatic Emergency Braking and all ADAS features are disabled. The vehicle cannot safely detect obstacles or pedestrians. GPS navigation is frozen. Tesla has confirmed the computer requires replacement but is classifying it as a customer-pay repair citing expired warranty, despite the failure occurring during Tesla's own recall remedy software deployment. This vehicle meets every technical criterion of Recall 26V283000 — HW3 hardware, 2021 Model Y, software version 2026.8.6.1, complete camera failure — but does not appear in the recall VIN database. I am requesting NHTSA review whether this VIN should be included in recall 26V283000 or a related investigation.

NHTSA ID

11736560

Incident

Apr 30, 2026

The vehicle began experiencing repeated Autopilot/FSD failures while driving. Symptoms included sudden Autopilot disengagements, cruise control becoming unavailable, and loss of road visualization/navigation display functionality. The issue progressively worsened over time. The vehicle was first brought to Tesla service in 2025 for the same overheating-related concern. At that time, Tesla identified a coolant-related issue, topped off the coolant system, and returned the vehicle to service. However, the problem continued and gradually became more frequent and severe afterward. During the most recent service visit, Tesla diagnosed the HW3 Autopilot computer as overheating due to a heat transfer failure between the Autopilot board and cooling cold plate. Tesla stated that heat generated by the board could no longer be efficiently transferred to the coolant system, causing the Autopilot computer to overheat. Tesla further advised that continued operation without repair could eventually impact additional vehicle functions, including the center display screen shutting off due to overheating-related failures. Given the loss of driver-assistance functionality and potential impact to core vehicle systems, I am submitting this report so the issue is documented as a potential thermal management or hardware reliability concern involving the HW3 Autopilot computer system.

NHTSA ID

11736263

Incident

May 7, 2026

The rear camera has failed posing a safety issue when reversing the vehicle.

NHTSA ID

11731681

Incident

Apr 1, 2026

Incident Date: April 11, 2026 Approximate Time: 6:30 PM Component(s): Unknown (Suspected: Electronic Stability Control, Steering, ADAS) Description of Incident: On April 11, 2026, at approximately 6:30 PM, I was operating my Tesla Model Y on a highway with a self-driving mode engaged. I experienced what appeared to be a sudden, unintended acceleration combined with an erratic "zig-zag" steering pattern across multiple lanes. I am not certain of the technical cause, but the vehicle’s behavior felt like a loss of system control that was not initiated by me or the road conditions. I had to intervene immediately to prevent an accident. Post-Incident Actions and Manufacturer Contact: I have since contacted Tesla Service, and while they confirmed that data for that date exists, my formal "Privacy Data" requests for those specific logs have come back empty or missing the relevant timeframe. Summary of Concern: I am reporting this because I suspect a serious software or hardware malfunction occurred, though I do not have the technical diagnostic to confirm which system failed. The combination of the vehicle’s erratic movement and the subsequent difficulty in obtaining the data logs for this specific window of time leads me to believe there is a potential safety defect that requires investigation.

NHTSA ID

11731428

Incident

Apr 11, 2026

Getting message on screen since october 2025. That time total milage on my car was less then 30,000 STEERING ASSIST REDUCED and LANE DEPARTURE AVOIDANCE FEATURE UNAVAILABLE. I did reset / restart the vehicle / soft / hard reset, software update. and This both message got disappear and then again after sometimes its keep coming back. So i did appointment to rocklin tesla center and they gave me cost estimate $5770. Thats way too much so i decline but they said those message might keep popping up because of LOW VOLTAGE DISTRIBUTION AND CONTROLLERS. So i accepted that service and paid $359.68. But i am still getting same both messages on my tesla screen. Sometimes it does comes and sometimes it does not. I did online research and people with same problem stating that because of TESLA's poor manufacturing steering wheel and some kind of faulty circuit board causing this issue. My car never been to any accident and its very low on milage. Please look for other tesla owner who has same problem and tesla has to fix this problem without charging this much amount. Thanks

NHTSA ID

11729305

Incident

Oct 16, 2025

The vehicle's Autopilot/Full Self-Driving (HW3) computer has failed at approximately 70,000 miles. Tesla Service has diagnosed the vehicle as requiring replacement of the HW3 computer. As a result of this failure, multiple safety related systems are inoperative, including collision avoidance, lane assist, lane departure warning, automatic wipers, and other driver assistance features including adaptive cruise control. The vehicle is also unable to receive over-the-air software updates, including potential safety updates. In addition, the vehicle experiences system lag, including delay when shifting into Drive or Reverse. The center display is slow to respond, and certain media and software features are no longer functional due to inability to update. This condition increases safety risk because active safety systems designed to assist with collision prevention are disabled. The failure appears to be hardware-related and not due to normal wear. Tesla has confirmed the need for computer replacement but has declined coverage as the vehicle is outside warranty. The failed component should be available for inspection upon request.

NHTSA ID

11720961

Incident

Mar 26, 2025

Vehicle will suddenly apply brakes while using standard cruise control for no apparent reason. This is extremely dangerous as it has almost caused several accidents on the highway. I have almost been rear-ended several times. This is a very common problem and well documented problem referred to as "phantom braking" on Teslas and something needs to be done immediately.

NHTSA ID

11720876

Incident

Feb 25, 2026

The car suddenly reduced lane assistance and steering assistance functionality. After calling Tesla they said it is not a software issue. I checked the service mode and it indicated a malfunction in the steering assist motor, which apparently costs $3500 to replace. Online, I have found many complaints about this problem that are not resolved by software updates. In addition, there was a large number used steering assist motors for sale online which indicates a more wide spread problem. This is not normal for cars to have this failure prematurely and is a serious safety hazard. I read online that some had their steering EPAS get locked while driving on the highway and nearly destroyed their Teslas

NHTSA ID

11718843

Incident

Feb 1, 2026

When driving with cruise control engaged the car randomly brakes and shows a "curvature assist " indication. The car quickly slows from 55 to 35 with no warning. This primary happens on a straight road, not a curve. I am concerned about the traffic behind me.

NHTSA ID

11713621

Incident

Jan 27, 2026

I noticed the windshield washer nozzle on the passenger side isn't either working or not there. I reached out to Tesla, and also stopped by a Local Dealership and they told me that it would cost me out of pocket, since it's out of warranty. Secondly, the left side driver repeater camera has a Glare when turned at night time only. which is quite dangerous due to very less visibility due to the Glare of the Turn signal light that causes the repeater camera to function properly. this is a on going known problem. I have reached out to Tesla for this matter. and I was advised that it would not be covered since it's not under warranty. This issue should be a recall that Tesla should fix. this isn't an issue caused by normal wear and tear it's a manufacturer defect.

NHTSA ID

11709822

Incident

Aug 26, 2025

In early Nov 2025 my Tesla Model Y began intermittently showing warnings about the forward collision warning system and multiple sensors being offline. Tesla service replaced a faulty connector on Nov 3. On Nov 15, 2025, about two weeks later, the car had a sudden drivetrain failure while I was parking on a steep hill. I heard a loud bang from the front of the car and the vehicle immediately lost drive power and had to be towed. Tesla diagnosed a failed front motor inverter that blew the high-voltage pyrofuse and damaged the 12V battery; they replaced those parts. The vehicle is available for inspection and the repaired components and records are with Tesla. After that repair the car needed another visit for alignment and has continued to show worrying behavior: “VCFRONT offline/unable to contact VCFRONT” in the service menu, repeated “autopilot computer overheating” messages, intermittent loss or reduction of regenerative braking (braking feel changes unpredictably), a rear right seatbelt malfunction warning (later inspected and cleared by Tesla), and what appears to be significantly increased battery drain compared to before the inverter failure. This has now resulted in four service visits within about a month, all at Tesla service centers (no police, insurance, or independent shops involved). Tesla has confirmed the inverter/pyrofuse/12V failure and says the overheating was due to an air pocket in the cooling system, but the VCFRONT messages, inconsistent regen braking, and increased drain have not been fully resolved or clearly explained. I am concerned that a sudden loss of power, loss of regen, or failure of VCFRONT/autopilot systems could recur at speed or in traffic, creating a serious safety risk. Please note that I'm only able to view partially-complete paperwork from the latest service appointment in the Tesla app. I have requested this documentation from Tesla and will be able to provide all the service reports and communication as a follow-up.

NHTSA ID

11704381

Incident

Nov 15, 2025