Electrical System Problems of Tesla Model 3 - part 1

I was locked inside my Tesla Model 3 two stories down in a parking garage with no internet access to find out where the emergency release was for my door. I kicked my driver side window to survive. It wasn't until after I was told that the doors are tied to a 12v battery that had died without warning. I did not know the doors tied to that nor that there was a secret emergency release. There are no clear indicators within the car that this is how it operates and you shouldn't need internet access and electricity to survive exiting a car.

See all problems of the 2019 Tesla Model 3 🔎.

I am writing to report an accident involving my son who was driving Tesla 2024 model-3 on July 18th 2026 approximately 10:15 am est. He was returning home from his volunteering with emergency medical service(ems) when the vehicle's steering wheel suddenly froze. While attempting to maneuver the vehicle to safe location , it collided with a roadside barrier. Fortunately , my son was not injured , but the vehicle sustained significant damage, including deployment of airbag and damage to front passenger side. This incident occurred at a speed of approximately 26 mph.

See all problems of the 2024 Tesla Model 3 🔎.

While out on vacation in [xxx] on xxx at around 11 am I had just finished charging the Tesla at a supercharging station. I was headed to go eat breakfast at the intersection of [xxx] and xxx on the right lane. I stopped briefly prior to making a right onto [xxx]. Upon making the right turn the vehicle kept turning all the way right and making a sharp right turn instead of a soft right. When I noticed the sharp right turn I tried to turn the steering wheel towards the left but the steering wheel was locked and it wouldn't respond. The car drove me into a concrete barricade and caused a collision. My children were in the car and thankfully no one in my vehicle was seriously injured nor were there any pedestrians on the sidewalk near the barricade. I contacted Tesla for the repair and investigation into why the steering wheel locked. Tesla has not provided a loaner vehicle in the meantime despite my frequent requests. This incident is a serious and critical safety issue that may have caused deaths had I been traveling at a higher rate of speed or been on the highway heading back to [xxx]. The strange thing is that this vehicle is still under warranty with Tesla and had been working just fine without any issues since I got the vehicle in xxx. No warning messages, or symptoms to indicate any malfunction. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

See all problems of the 2025 Tesla Model 3 🔎.

The center touchscreen/camera display system in my 2021 Tesla Model 3 is malfunctioning. The vehicle’s camera views do not work properly on the center display, including camera visibility needed for reversing and safe operation. The failed system is available for inspection upon request. This creates a safety risk because the vehicle relies heavily on the center screen to display camera views and vehicle information. When the camera display does not work properly, rear and surrounding visibility is reduced, especially while reversing, parking, changing lanes, or maneuvering around pedestrians, vehicles, curbs, and other obstacles. Tesla has refused to repair or cover the repair. The problem has been reported to Tesla. Tesla has not provided a satisfactory safety-related repair solution. It is unknown whether Tesla has fully inspected the failed component or confirmed the exact cause. There were no known warning lamps before the failure. The symptom is that the camera display/center screen camera views do not function properly when needed. The issue appears to involve the center display, camera display system, camera hardware, wiring/harness, vehicle computer, or related software. The exact cause is unknown. I am reporting this as a potential safety defect involving loss or malfunction of the camera display system in a 2021 Tesla Model 3.

See all problems of the 2022 Tesla Model 3 🔎.

I am getting an electrical fault which has disabled my front passenger seat airbags. They need to replace the wiring, which means they also now need to replace the passenger airbag itself because wiring has changed and the old airbag is not compatible with the new wiring. Replace occupant classification system (OCS) of front passenger seat while servicing subcomponents update front passenger airbag to maintain compatibility with front passenger seat I had this same error 4 months ago and it ended up shorting out the entire electrical system, which disabled autosteer and eventually completely disabled power steering which made the car unusable. Tesla service center called it a water intrusion problem and had to replace the entire front electrical harness system and steering rack costing $4500. Now the problem has resurfaced and I'm afraid I might lose power steering again which is extremely dangerous and could happen any time, in addition to my airbags potentially not deploying.

Vehicle displayed a “safety restraint system issue - service required” alert (fault codes rcm_a056 and rcm_a032). Tesla diagnosed an open circuit between the driver-side curtain airbag and the left airbag controller, requiring replacement of the left body harness. Tesla quoted approximately $1,800–$2,200 for the out-of-warranty repair. This is a known, recurring pattern — multiple other 2018 Tesla Model 3 owners report experiencing this identical fault at nearly the same mileage (~78,000 miles), suggesting a design or component wear issue rather than isolated damage, similar to a prior Tesla trunk-harness recall (NHTSA campaign 21v-00d) that also stemmed from a wiring/harness defect on this same vehicle. I am requesting NHTSA investigate whether this represents a safety-defect trend warranting a recall.

See all problems of the 2018 Tesla Model 3 🔎.

High voltage fast charge contactors experienced partial weld failure (bms_a167_sw_fc_partial_weld) during routine supercharging, causing complete hv system shutdown (hvstate = hv_down). Vehicle also threw bms_a085/a086 pack and fast charge contactor mismatch codes. Tesla service is refusing to cover repair under the 8-year hv battery warranty, claiming fast charge contactors are not a warranted component despite being integrated into the hv battery assembly. Vehicle has been at duluth, GA Tesla service center since approximately June 8, 2025.

The vehicle was purchased pre-owned directly from Tesla. On the day of pickup and five days later, while operating on full self-driving (fsd), the vehicle phantom-braked abruptly and then dangerously accelerated through a solid red light into cross-traffic intersections. The driver had to forcefully override the vehicle to prevent a crash. Tesla service center was notified but dismissed the issue, performing only a camera recalibration and charging a fee. Following the service appointment, the red-light running behavior stopped, but the vehicle continues to suffer from aggressive, sudden phantom braking multiple times on every single trip, creating a severe and continuous risk of a rear-end collision on public highways.

See all problems of the 2023 Tesla Model 3 🔎.

Rear passenger door electronic release did not work. Technician indicated rear door harness corroded making the door inoperable.

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.

See all problems of the 2021 Tesla Model 3 🔎.

Complaint title: defective horn system on 2026 Tesla Model 3 - ineffective in rain or highway conditions description: the horn on my 2026 Tesla Model 3 highland is dangerously inadequate. It uses a single pedestrian warning speaker instead of a proper horn, which is easily overpowered by road noise, tire noise from large trucks, and especially rain. I cannot reliably alert other drivers, including 18-wheelers, when they are drifting into my lane or failing to yield. This creates a serious safety risk in wet conditions and highway driving. Traditional horns have been effective for decades — this design fails basic safety expectations. I am requesting immediate investigation and a fix.

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.

It showed message that emergency brakes not available. It was related to wire hardness inside the trunk lid. I had to get it replaced. Tesla did not cover it.

The contact owns a 2022 Tesla Model 3. The contact stated that while operating the vehicle, abnormal crackling and bubbling sounds were heard coming from underneath the rear seat. While driving later, an electrical arcing sound emanated from the same area. While at a local charging station, the contact discovered that the battery failed to charge when connected to a high-voltage charger; however, the battery could still be charged at the contact's residence using a 110-volt charger. The vehicle was driven to a local dealer, who was unable to identify the problem, and no service was performed. The vehicle was driven back to the charging station, but the high-voltage charging failure persisted. The vehicle was then towed to a local service center, where it was diagnosed and it was determined that the high-voltage battery required replacement. The high-voltage battery was replaced, and the vehicle was repaired. The manufacturer was notified of the failure. The failure mileage was 38,200.

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.

During autopilot, the vehicle failed to recognize the curve (or did not input enough turning to steering) and accelerated at the curve thinking it is a straight to almost have me crash into a guard rail. No symptoms. No side damage or collisions with others.

This car was designed without steering wheel stalks for control of the directionals. In their place it uses push buttons on the steering wheel. It becomes difficult to start the directionals when the steering wheel is turned because the buttons are no longer in a standard position and aren't easily located. This is especially difficult in traffic circles or when making rapid turns where directionals are needed. In addition if your fingers are kept rested on the buttons the system alarms and tells you they have been in place too long and the buttons stop working. I believe Tesla should offer an after market replacement returning to a much safer and standard steering column stalk which is and has been used on almost all cars for at least 75 years.

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.

While driving my Tesla, autopilot was engaged and navigating with the destination entered. At the time of the incident, my hand was on the steering wheel when the vehicle suddenly attempted to make a hard right turn toward a divider. This was not an exit or intended route, which raises serious concerns about what caused the vehicle to react that way. In addition, I have experienced multiple battery-related issues with this vehicle. The battery has already been replaced once, and on approximately 2–3 occasions the vehicle entered “turtle mode,” limiting the car to about 35–50 mph. This created a serious safety hazard because it occurred while I was driving on the highway alongside tractor-trailers and fast-moving traffic.

The wiring in my trunk harness was severed due to the repeated opening and closing of my trunk. This caused my reverse lights to fail and my trunk latch to stop working. This issue is part of a known recall: campaign 21v-00d. Tesla attempted to fix the issue in 2023 but the poor repair did not work. I took my Tesla to the dealer and they refused to remedy the issue unless I would pay $1300. I persuaded them to lower the feet to $300 but still feel that I should not pay anything because this issue was due to the recall.

See all problems of the 2020 Tesla Model 3 🔎.

I am reporting a serious safety incident involving a 2023 Tesla Model 3. On March 29 at approximately 5:00 pm, while driving on the freeway at about 65 mph, the right-side passenger door suddenly opened while the vehicle was in motion. The door had been fully closed and latched prior to driving. There was no impact, obstruction, or warning indicating that the door was not secure. The opening occurred unexpectedly during normal driving conditions, creating a significant safety risk. After the incident, Tesla was contacted and indicated that a diagnostic inspection would require a fee, and they suggested the possibility of prior modification or tampering but did not provide a confirmed cause. The vehicle was purchased from a used car dealership, and the incident raises concerns about a potential mechanical or electronic failure of the door latch system and the safety of the vehicle as sold. This issue poses a serious risk to occupants and other road users, particularly at highway speeds. I am requesting that this incident be reviewed as a potential safety defect.

Door cannot be opened during power loss / emergency. I am a Tesla Model 3 owner in California. I discovered that the rear doors do not have a mechanical emergency release. Tesla service confirmed that my vehicle does not include any manual rear emergency door release system. This raises a serious safety concern because, in the event of a crash, fire, or 12v power failure, rear passengers—especially children or elderly occupants—may be unable to exit the vehicle. I request NHTSA to investigate whether the absence of a mechanical rear emergency release complies with fmvss 206 and whether Tesla’s design poses a safety risk during emergency egress.

The rear doors intermittently will not unlock. Even after hitting the unlock button from menu or short or long press of the driver unlock button or from the app unlock button. The driver only unlock feature is disabled. I have video that would not upload. Snapshots of video included.

My Tesla Model 3 was brought to Tesla princeton service center on February 27, 2025 for a 12v battery replacement. During the service visit, Tesla also replaced the rear glass, citing the rear defroster as the root cause of the battery drain — a repair that was added without prior discussion and increased the total invoice from an original estimate of $180 to a final charge of $1,730. Upon picking up the vehicle, the rear backup camera, blind spot cameras, navigation system, sentry mode, and windshield wiper sensor were all non-functional. None of these systems showed any malfunction prior to the service visit. Tesla princeton’s service advisor denied responsibility without performing diagnostics, and in a subsequent message admitted he could not determine the cause with certainty without diagnostics — which have still not been performed. The vehicle was discharged from a licensed Tesla service center in a condition non-compliant with fmvss 111. I have escalated this matter to Tesla executive leadership in writing and am filing this NHTSA complaint to create a federal record of this safety violation.

An incident that occurred while full self-driving (fsd) was engaged. During the drive, the vehicle unexpectedly steered toward the curb while making a right turn. I was actively monitoring the vehicle and immediately took control of the steering, but the vehicle still made contact with the curb. After the incident, the vehicle developed steering misalignment, vibration while driving, and abnormal noise, which suggests possible suspension or wheel damage. Since fsd was engaged at the time, I would appreciate it if Tesla could review the vehicle logs and investigate whether there was any system malfunction or unexpected behavior from the fsd system.

My 2022 Tesla Model 3 experienced a heat pump compressor failure at approximately 89,457 miles. Tesla service center diagnosed an internal failure in the heat pump system. The heat pump system controls cabin heating, windshield defrosting, and thermal management for the vehicle. When the system failed, the vehicle lost heating and proper defrost capability. This can impair windshield visibility during cold or foggy conditions, creating a potential safety hazard while driving. Tesla quoted approximately $3,000 to repair the compressor and declined warranty assistance despite the system being critical to safe vehicle operation.

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.

After downloading Tesla’s update (no. 2025. 44. 25. 4) software my heater (with the window defrost functionality) in winter stopped operating. I made my update while at my nearest Tesla service compound (location verifiable per system location log) on 01/25/26 when that same day software began throwing hvac error codes with blowing cold air, when previously my heat ran well. This is not coincidental; this is system design failure.

When cabin heat is enabled, visible vapor/smoke emits from the front trunk area under the windshield cowl and is pulled directly into the cabin through the hvac intake. The vapor has a chemical/sweet odor consistent with coolant or refrigerant. Smoke enters the passenger compartment, especially when stopped or idling. This occurs repeatedly in cold temperatures and stops immediately when hvac heat is turned off. No warning lights appear. This appears to be a heat pump or coolant system leak upstream of the cabin intake, allowing chemical fumes to enter the cabin air stream. Occupants are exposed to fumes while driving. This is a safety concern due to inhalation risk and lack of driver warning.

Screen is black and no app access. No power to accelerate.

There is no mechanism to unlock the rear passenger doors in case of electrical failure. No emergency mechanical door opening in case of emergency. Passengers will not be able to get out of the locked vehicle during an emergency (I. E. Crash, battery fire, submerged in water, etc). This is an extremely imminent danger for small kids who are sitting in car seats, since it will take even longer to release them from their straps in order to get out. The small rear windows are useless for escape. This flaw design has already caused deaths. Changes should be made to enable emergence mechanical opening of the rear doors.

Please review attachment.

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.

Recurring 12v low-voltage system failure and defective rear defroster heater grid vehicle: 2022 Tesla Model 3 (VIN: [xxx] ). Odometer: 114,093 miles at time of third service visit. Summary of defect: vehicle has experienced recurring low-voltage (12v) system alerts since late December 2025. The 12v battery has been replaced three times by Tesla service. After each replacement, the low-voltage alerts return within days. Tesla's diagnostic system detected a dcr (DC resistance) reading of 16. 8 milliohms against a threshold of 16 milliohms, indicating the battery's internal resistance is too high for the vehicle's electrical system to function properly. A brand-new 12v battery showed "degraded - replace" status within one week of installation. These low-voltage errors did not exist before Tesla replaced the 12v battery during the first service visit. Diagnostic findings: during the third service visit (February 2026), Tesla technician performed a resistance check on the rear defroster heater grid and described it as "out of spec but not significantly. " ground straps were also described as "out of spec but again not significantly. " the technician stated there was "no smoking gun yet" and it was "maybe a combination of all leading to the 12v warning. " Tesla proposed replacing the rear backlight glass at a cost of $1,265 to the customer. Additionally, severe rodent damage was discovered in the front wiring harness with chewed wires and nesting material. Despite this confirmed damage to the electrical system, the service manager stated the rodent damage was "not associated with the error" while the technician simultaneously stated there was no confirmed root cause. Safety concern: the recurring 12v low-voltage condition presents a safety risk. The 12v system powers critical vehicle functions including exterior lighting, hazard lights, door locks, windows, the vehicle's computer systems, and safety features. Repeated system alerts include dif_a018_hwlvsupplyuv (ha information redacted pursuant to the freedom of informatio.

The blinkers do not respond to the change in blinkers when I initiate the blinker (right or left) by using the stalk. There has been numerous times that I fully pull down or push up the blinker stall and it would not engage the blinker but today I am reporting it because now I almost changed the lane after engaging the blinker but it didn’t happen.