What 650 owners told NHTSA about the 2021 Tesla Model 3 Bev

The high voltage battery on my 2021 Tesla Model 3 Standard Range suddenly failed without any prior warning or gradual degradation. The vehicle was consistently achieving approximately 180 miles of range per full charge. Overnight, the battery charge was restricted to approximately 30% capacity, reducing usable range to roughly 30 miles. No warning signs or symptoms appeared prior to this failure. The failure was sudden and immediate. The vehicle displayed the alert "Maximum Battery Charge Level Reduced / OK to Drive, Schedule Service." The battery has been confirmed by a Tesla Service Center as having an internal fault. The only remedy offered by Tesla is full battery replacement at a cost of approximately $9,000 to $14,000 depending on the option selected. This failure poses a safety risk as the severely limited range can result in the vehicle becoming stranded unexpectedly, particularly during highway driving or in areas without nearby charging infrastructure. The failure occurred approximately 6 months after the battery warranty expired with no prior indication of degradation, suggesting a potential defect in the battery unit. The vehicle has been inspected by a Tesla Service Center and the fault has been confirmed. The component is available for inspection upon request.

NHTSA ODI 11750373

The contact owns a 2021 Tesla Model 3. The contact stated that while the vehicle was set to Self-Driving Mode, the vehicle suddenly stopped abruptly without the brake pedal depressed. The contact depressed the accelerator pedal immediately to continue driving. The vehicle was taken to the dealer three times. The dealer reset the mirrors and sensors; however, the failure persisted. The vehicle had not been repaired. The dealer suggested that the contact purchase another vehicle. The manufacturer was not made aware of the failure. The failure mileage was unknown.

NHTSA ODI 11746195

This is my fourth high voltage battery failure on this vehicle. Battery replacements occurred at approximately 13,000 miles, 60,000 miles, 96,000 miles, and now at 121,000 miles. The first failure occurred at 13,000 miles on a nearly new vehicle. During the second replacement a Tesla service technician verbally stated that 'the refurb process has vastly improved since your last battery' before retracting the statement when questioned, strongly suggesting refurbished units were installed in a vehicle under original warranty. Tesla has declined to cover the most recent failure citing warranty expiration, despite this being a documented recurring defect that originated well within the warranty period. The vehicle is currently inoperable due to high voltage battery failure. I was around 40 days outside of warranty with this last failure.

NHTSA ODI 11745925

2021 M3 138,000 miles Alerted error code BMS_a074 & BMS_a079 After reading forums, this seems to be a known issue with 2021 in particular. I am reporting in hopes something can be done about it. Yesterday both codes alerted within hours of each other. First that the charging was limited to 50% and would only charge once <50%; then shortly thereafter it alerted with Unable to Charge. I attempted to charge at home with 32A charger when at 28% and charge limit set to 50%— car would not charge. Today I put in Tesla service request with first appointment available in 10 days (still awaiting review). Attempted to try charging again while at home and this time, coincidentally after my service request, it is now charging. I lowered to 20A to trickle in for now…and currently up to 32%. March/April 2025 my ECU went out after 3 12V battery replacements within 2 months. Car has been driving well but without any camera systems (traffic awareness) or entertainment system.

NHTSA ODI 11736600

The vehicle is undriveable due to a high‑voltage enable safety lockout triggered by ECU identity/MAC mismatch after a software/update window; local service instructed me to ‘safely disregard’ active safety alerts contrary to vehicle telemetry, creating a safety risk. Chronology (key timestamps) • Jan 28, 2026 — Low‑voltage undervoltage precondition recorded (DIF_a018). • Feb 2nd, 2026 — Low‑voltage undervoltage precondition recorded (DIF_a018). • Feb 03, 2026 08:46 — Identity/MAC invalidation alerts (CP_a089 / CP_a077); HV‑enable blocked cascade. • Feb 24, 2026 — Service app: estimate approval prompt; supervisor instruction to ‘safely disregard’ active HV alerts captured via screenshot. • Feb 27, 2026 — Persistent handshake stall (CP_a066, State B1) despite ‘successful’ software job and new firmware update to patch the 2026.2 tree branch software. Vehicle remains grounded. Safety Concern Vehicle telemetry states HV contactors are blocked to protect the vehicle; service staff advised to disregard active alerts. Inconsistent guidance risks unsafe operation. I grounded the vehicle pending engineering review. Troubleshooting and A/B Tests My home EVSEs successfully charge a different Tesla (Model Y). The subject VIN charges at DC fast charging (Supercharger) and once on a third‑party EVSE, but fails on my two home EVSEs thereafter. This localizes the issue to vehicle‑side AC charge path/charge‑port logic rather than the EVSE. Request OEM to provide CP waveform under load + Toolbox logs. Please log this safety‑related defect; aggregate with similar complaints, and, if appropriate, open an investigation into identity/integrity faults causing HV‑enable lockouts and conflicting service guidance

NHTSA ODI 11721572

To Whom It May Concern, I am submitting this complaint to report a serious and potentially dangerous safety defect affecting my 2021 Tesla Model 3 Performance. After exposure to heavy rain or wet conditions, the vehicle’s horn completely stops functioning. The failure occurs regardless of the activation method—neither pressing the steering wheel horn nor using the horn via the mobile app produces any sound. The horn remains nonfunctional even though the vehicle is otherwise operable. This issue has occurred after the vehicle becomes wet due to rain and appears to be related to moisture intrusion or an electrical/design flaw. Once the failure occurs, the driver fully loses the ability to use the horn for warnings or emergency signaling. This is a critical safety concern. The horn is a federally required safety device and is essential for alerting pedestrians, cyclists, and other drivers to avoid collisions. Losing horn functionality significantly increases the risk of accidents, especially in urban driving, highway merging, and emergency situations where immediate warning signals are necessary. This issue is not isolated to my vehicle. Numerous Tesla owners have reported the same horn failure after rain or wet conditions on online forums and owner communities, indicating a widespread and systemic defect rather than isolated wear or misuse. Given the safety implications and the volume of similar reports, I respectfully request that NHTSA investigate this issue to determine whether a design or manufacturing defect exists and whether corrective action or a recall is warranted. Thank you for your attention to this matter. Owner – 2021 Tesla Model 3 Performance

NHTSA ODI 11708149

After Tesla replaced my high voltage battery in May of 2024 all of the following started to happen. Prior to the replacement none of these issues were present. While driving under normal conditions, my 2021 Tesla suddenly and violently steered into an oncoming lane or toward the roadside without any driver input. The steering wheel physically turned on its own with force. Full Self-Driving was NOT engaged at the time of the incident. This was not lane assist correction and occurred without warning. Importantly, the vehicle did NOT issue a warning at the time of the steering event. A “Take Control Immediately” message appeared several minutes AFTER the incident, not before or during, indicating a delayed or failed system response. This defect began immediately after a High-Voltage Battery replacement performed by Tesla Service in May 2024 and has occurred multiple times since. The incident presents a serious safety risk, including loss of vehicle control, roadway departure, or head-on collision. In addition to the steering defect, the vehicle began exhibiting multiple electronic and control anomalies immediately after the High-Voltage Battery replacement. These include navigation/map screen failures, windows adjusting themselves while driving, random “cannot shift into drive” warnings, system failure messages, camera malfunctions, and unexpected screen reboots. These issues did not exist prior to the battery replacement and support the presence of an underlying electrical or control system instability related to the steering defect.

NHTSA ODI 11706126

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)

NHTSA ODI 11703590

I have been very cautious on charging my Tesla Model 3 and have followed all of the manufacturer's recommendations. The HV battery recently failed at 105,050 miles. South Korea has noted a battery reliability issue for this year car and model, so I am reporting this to you so if a recall is needed, you can track this. I believe my battery is a Panasonic NCA.

NHTSA ODI 11698493

Resistive occupancy sensor consistently failing causing: -Bluetooth to not automatically connect anytime the vehicle is entered - vehicle puts itself in park to prevent rollback if seatbelt is not applied - car does not recognize when driver is in seat These are serious safety concerns as it could cause a domino effect in safety features if not applied when needed.

NHTSA ODI 11685809

Attempting to park. Slowly inching forward while turning left. Vehicle accelerated. (Sudden Unintended Acceleration: SUA) Vehicle jumped a curb, bounced off a tree, dropped off the curb before comping to a stop. Internet search shows other similar reports; attributed, by Tesla, as pedal misapplication. This was not "pedal misapplication". I am not looking for anything. But NHTSA should increment occurance counter by 1. Tesla has a problem. Electrical or Mechanical...do not know. They have also lost me as a customer. The car will be sold. I have video...mp4

NHTSA ODI 11663381

my 21 M3P 27K miles threw BMS_a079 I've never used a supercharger and rarely charge over 80% mostly charging at work on lvl 2 & occasionally at home on lvl 1 vehicle will no longer charge I've tried 2 Button reset and HV disconnect no help. 27k miles seems unreasonable for a battery malfunction on a vehicle that has been cared for meticulously.

NHTSA ODI 11657017

Vehicle Info: Make: Tesla Model: Model 3 Year: 2021 Incident Date: April 7, 2025 Mileage: 49,000 miles Component: Electrical System / Software / Powertrain While driving on a public road, my Tesla Model 3 experienced a total system lag and shut down unexpectedly. The screen and vehicle controls froze, and the vehicle became unresponsive, leaving me stranded in the middle of the road. Tesla service later stated that the car computer had “slow FPS” (frames per second), which they claim caused the issue. They cleared memory, updated firmware, and said no further diagnosis was needed. However, no root cause was provided, and I am concerned that this issue could reoccur. This kind of unexpected shutdown while driving is a serious safety concern. I was lucky to avoid a collision, but if this had happened on a freeway or near traffic, the outcome could have been worse. I am filing this report in hopes that NHTSA will investigate whether this is an isolated issue or part of a broader safety defect related to Tesla's onboard software or power management systems.

NHTSA ODI 11653607

UNKNOWN

NHTSA ODI 11628595

The contact owns a 2021 Tesla Model 3. The contact stated while driving approximately 65 MPH, the braking system erroneously activated, causing the vehicle to abruptly decelerate. The contact stated that the failure was due to a failure with the computer reading the speed limit as 45 MPH instead of 65 MPH. The cause of the failure was not yet determined. The manufacturer and local dealer were not notified of the failure. The failure mileage was 35,000.

NHTSA ODI 11620649

The contact owns a 2021 Tesla Model 3. The contact stated while driving at various speeds, the hood opened unintentionally, the A/C unit and the radio intermittently turned on and off, the infotainment system screen intermittently turned black and randomly turned back on, along with several other failures that occurred. No warning lights was illuminated. The failures occurred on several different occasions. The contact was notified that the VIN was included in NHTSA Campaign Number: 24V554000 (Latches/Locks/Linkages, Electrical System) however, while attempting to update the vehicle software, the vehicle failed to complete the software update. The vehicle was drivable and was taken to the place of residence; the contact attempted to get in contact with Tesla Roadside Assistance however, once the contact reached the "confirm pickup spot" screen, the screen froze and would not confirm the request. The vehicle was not repaired. The contact attempted to notify the manufacturer however, the contact received no response in return. The failure mileage was unknown.

NHTSA ODI 11617973

The contact owns a 2021 Tesla Model3. The contact received notification of NHTSA Campaign Number: 24V554000 (Latches/Locks/Linkages, Electrical System); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was contacted but saw no recall information related to the VIN. The manufacturer was not made aware of the issue. The contact had not experienced a failure. Parts distribution disconnect.

NHTSA ODI 11614468

I am writing to file a formal safety complaint regarding a critical malfunction that occurred with my Tesla Model 3 on [XXX], in West Palm Beach, Florida. This incident raises significant concerns about the safety and reliability of Tesla vehicles, particularly following software updates. Incident Overview: On [XXX], around 5:00 PM, I placed my French Bulldog in the back seat of my Tesla Model 3 and closed the passenger side rear door. As I walked around to the driver’s side, all the doors locked automatically, and I was unable to open any of them. Despite multiple attempts to unlock the car using both my iPhone and key fob, the vehicle remained locked. My dog was trapped inside the car, and I became increasingly panicked, especially considering the extreme summer heat in Florida. I immediately contacted Tesla customer service, but after a 15-minute conversation, they were unable to unlock the car remotely. I was forced to call 911, and the fire department had to break the passenger side window to retrieve my dog. Even after the window was broken, the doors still wouldn’t unlock, and I had to pull my dog out through the shattered glass. Additional Details: The car was charged to 80% just a couple of days before this incident. After this incident, the car is completely dead. It is non-functional, and I cannot power it on or access any of its systems. The day before this incident, I completed a software update on my Model 3, which I believe may have caused or contributed to the malfunction. There is CCTV evidence of the entire incident, which I can provide upon request. My dog was severely traumatized by this experience and is now fearful of being in the car, even when it is parked in the garage. I was also extremely distressed during the incident, and the situation could have resulted in a much worse outcome. Please advise on the next steps for an investigation, and let me know if you require any further information or evidence. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11609726

The vehicle, a 2021 Tesla Model 3, had an episode of sudden unintended acceleration. I was almost stationary waiting to make a left when the car accelerated by itself, left the road, crossed a grass field at high speed and crashed into bushes. The vehicle was not on auto pilot, it resulted in damage of almost $ 20.000 as estimated by insurance. The vehicle is available for inspection, it will be checked by Tesla service after the damage is fixed. There were no previous warnings, this is the first incident of this kind. It is not clear what component malfunctioned, probably some electric/electronic device in charge of acceleration. It was obviously a very dangerous event that could have jeopardized my safety and/or some others.

NHTSA ODI 11592876

While driving, no warning, car went dead, no control over lights, windows (can’t use hand signals), power steering, unclear if parking brake worked. Had towed. 12v battery died. No explanation as to why there was no warning.

NHTSA ODI 11591417

See attached document for complaint

NHTSA ODI 11583618

My vehicle is 3 years old and has roughly 52000 on it. After a recent software update (within the past month or so) all of the automatic safety features such as automatic braking, blind spot monitoring, cruise control stopped working on the vehicle. I brought it to Tesla and they confirmed the issue and said the entire ECU needs to be replaced, a $2700 expense on a 3 year old car. There is a warning message every time I start the car that says the automatic breaking is not working.

NHTSA ODI 11581476

UNKNOWN

NHTSA ODI 11575945

Complete computer failure leaving cars safety systems not working. Had to pay 3000$ for a new computer for a new car. Did not have car for three weeks. No systems would work.

NHTSA ODI 11574331

My 2021 Tesla Model 3 shuts/powers down WITHOUT warning while driving with a battery charge >0%. This unsafe event has occurred twice now! While the battery gauge displayed 10%, I was driving about 60mph when all of these warning messages appeared prompting me to pull over. As soon as these messages displayed, my car lost all propulsion and I was left stranded in the middle of the road. Both times I narrowly avoided being hit by other vehicles traveling at high speeds since my car died in the roadway. The car was towed to Tesla on both occasions, and they weren't concerned about my safety issue in the slightest. Instead, they said the battery just ran out; however my car displayed that I had about 6-10% charge remaining. So, if the battery were completely depleted (like Tesla says), then the meter should have displayed a 0% reading at the time of the breakdowns or, there is something defective with the battery/computer. Tesla service has refused to investigate the cause of the safety issue and, thus, refused to replace the EV battery (even though my car is still under the manufacturer's warranty). Electric vehicles should not die/run out of battery at 10% charge. However, my EV has done so TWICE! Tesla says that I just ran the car out of battery but has no response when I show them the pictures and video proving that the car died when there was, in fact, a decent amount of charge remaining on the vehicle (PLEASE SEE ATTACHED VIDEO AND PICTURES). If your phone died at 10%, then you would take it back to the manufacturer and demand that they fix the defective product. However, Tesla refuses to help fix my defective vehicle and just tells me that it is "operating as intended". EVs should not just lose all propulsion mid-drive. This creates an unsafe vehicle for me to drive, for my two young daughters in their car seats, and for other drivers who might hit me. I can provide other Tesla owners who have had a similar experience. Please force Tesla to take action!

NHTSA ODI 11559885