Electrical System Problems of Toyota Corolla - part 1

Dear national highway traffic safety administration, I am submitting this email to formally report a potential vehicle safety defect involving my 2022 Toyota Corolla. Vehicle information: - make/model: 2022 Toyota Corolla - in-service date: 08/18/2022 my vehicle sustained significant wiring damage caused by rodents. Toyota has denied warranty and financial assistance, characterizing the issue as an “outside influence. ” however, according to what I read online, modern vehicles —including Toyota models—use soy-based or bio-based wiring insulation, which is widely documented to attract rodents. The damage affected critical electrical wiring, creating potential safety hazards including loss of vehicle function and increased fire risk. This is not merely cosmetic damage but impacts essential vehicle systems. The foreseeability of rodent attraction due to wiring materials raises concerns of a design-related safety defect and failure to adequately warn consumers. Toyota has stated there are no recalls or customer support programs addressing this issue, despite recurring reports from vehicle owners nationwide. I respectfully request that NHTSA review this matter as a potential safety defect and consider whether further investigation is warranted. Thank you for your attention to this safety concern. Sincerely,.

See all problems of the 2022 Toyota Corolla 🔎.

While the vehicle was parked and powered off, a fire originated inside the driver seat area. There was no collision, no aftermarket electrical equipment installed, and no heated seat or accessory usage at the time of the incident. The vehicle was stationary when the fire began. The fire damage was concentrated within the driver seat assembly, consistent with a suspected electrical failure involving seat wiring, seat-mounted components, or associated harnesses. This is not consistent with owner misuse or external ignition sources. The insurer (allstate insurance company) declared the vehicle a total loss but declined further fire-origin or electrical defect investigation. The vehicle is at risk of being sold or dismantled through a salvage auction, which would destroy critical evidence related to a potential manufacturer defect. The vehicle is currently listed on copart (lot# 99091095 highlighted as ‘run and drive’) I have completed a power of attorney (hsmv 82053) per allstate requirement, along with a limited conditions notification for evidence preservation however allstate is refusing to accept the conditions stating their intent to sell it as salvage. This incident presents a serious safety concern involving spontaneous ignition within the passenger compartment. Similar failures pose a risk of injury, death, or property damage, particularly if ignition occurs while occupied. I am requesting that NHTSA review this incident for potential electrical system or seat assembly defects and preserve this complaint as part of any pattern or trend analysis involving Toyota vehicles.

See all problems of the 2019 Toyota Corolla 🔎.

On December 12, 2025, I was in a head on car accident in my 2021 Toyota Corolla nightshade. I was slammed into the steering wheel which caused injury. My car has over $14,000 worth of damage to the front yet my airbags did not deploy. I have taken my car to Toyota several times over the past few years and every time I’ve asked about a remedy for this recall I’ve been told there is no remedy as early as June or July 2025 I had to bring my car in for a manufacturer defect with the engine that Toyota fixed for free. I asked them about the recall on the airbags. They again told me there was no remedy.

See all problems of the 2021 Toyota Corolla 🔎.

2022 Toyota Corolla hybrid touchscreen/infotainment display randomly shut down while driving without warning and no longer functions. This could not be reset by holding the power button or disconnecting the vehicle battery. The backup camera still works, and the radio can be heard when the power button is pressed, but the display remains on a black screen and none of the controls on the steering wheel or headunit work. At night, the lights on the buttons for the multimedia display turn on and off every 10 seconds which is extremely distracting and has the potential to cause an accident. This defective part serves as a safety issue, as this is where critical maintenance and hybrid battery power related errors displayed. In addition there are many critical controls locked behind the screen related to door locks, hybrid battery usage, and other vehicle controls, as well as personal data that may now be at risk and unable to be able to be deleted. Vehicle was inspected by a lia Toyota of rockland dealership service department and determined to be a faulty display, requiring a compete unit replacement. The quoted cost is $2500, and despite my car having only 35500 miles, this is not covered under any warranty due to being outside the 36 month time window. The multimedia display in this car is a critical component and is just as vital to the car as the engine/transmission. It is a shame that Toyota reliability is a thing of the past.

This is in regards to Toyota csp 24te04 and the engine bypass system. This was also included in a class action lawsuit that got dropped. Engine bypass system is faulty and shows check engine requiring replacing of bypass valve and or wiring. According to 24te04 it has been affecting over 2 million cars, but not all are being fairly covered. They need to include all models with this system that were produced during this time. Thank you.

See all problems of the 2020 Toyota Corolla 🔎.

I am reporting an ongoing safety issue involving the skid control ecu and loss of power break recall on my 2024 Toyota Corolla hybrid. The first time, my vehicle experienced loss of power brake assist and displayed a “hybrid system malfunction” message on screen. I towed my car to Toyota, confirmed it was related to the skid control ecu recall and repaired it under the recall at no cost, they did a software update. The second time, the exact same problem reoccurred. I had the vehicle towed again to a Toyota dealership, but this time, they refused to perform diagnostics unless I paid out of pocket for a 12-volt battery replacement. The dealership stated they cannot confirm if the issue is recall-related until diagnostics are complete, but they also refuse to complete diagnostics without me paying first. My vehicle is currently undrivable and unsafe, and I rely on it for daily transportation and work. So they made my pay for this 12v battery to do the diagnostics and now they tell me it is not recall related but one of the relays not working, the repair will be cover under warrant but I had to pay for battery and rental cars . I believe Toyota is in violation of its obligations under 49 u. S. C. §30120, which requires manufacturers to correct recall-related safety defects free of charge. This issue leaves me without a vehicle and unable to verify that the recall has been properly resolved. I have opened a case with Toyota brand engagement. I am requesting that NHTSA review this case and ensure that Toyota complies with recall repair requirements so my vehicle can be safely diagnosed and repaired without charge.

See all problems of the 2024 Toyota Corolla 🔎.

After having no indication of any issue, my 2018 Toyota Corolla has stopped re-starting after fueling. The only light that appeared was regarding my battery. My battery is brand new and tested.

See all problems of the 2018 Toyota Corolla 🔎.

I have a engine maintenance required earring I did research it turned to be the coolant bypass valve.

"I am reporting a fatal crash involving a 2024 Toyota Corolla (VIN [xxx] I do not know the exact mechanical cause, but the following symptoms occurred: 1) the driver reported dashboard lights (red and blue) flickering on and off, windows and locks going on or off. 2) there was hesitation in acceleration after taking off, 3) the vehicle failed to stop and went airborne causing a fatal accident. Insurance CO. Failed to investigate porperly and sold the car to CO-part without waiting for probate forms to be complete for this vehicle and the estate. We have discovered this car was an avis fleet vehicle sold as 'new' at beaver Toyota. I am requesting a federal investigation to determine if a mechanical or electronic defect caused this loss of control. " information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The contact owns a 2020 Toyota Corolla. The contact stated that after the vehicle was started, the contact started driving, and a voice message was heard coming from the speaker on the driver’s side door, stating that the communication module had failed. The vehicle was taken to the dealer, where it was diagnosed, and determined that the data communication module needed to be replaced. The vehicle was not repaired due to the cost. The manufacturer was informed of the failure. The failure mileage was approximately 38,000.

I’m getting engine maintenance required visit your dealer, and it has to do with the a/c it only comes on when I turn on the a/c which has to work the “coolant bypass valve” I’ve looked online and many others have had issues it’s the 2020 and onward year Toyota, I’m not the only one many have mentioned they reach out the dealer & state this is not a recall and need to pay out of pocket to fix, but with some many people having same issue, doesn’t seem right that it wouldn’t be a recall with its multiples of people having this same issue.

The problem of windshield wipers going off either once, or at varying speeds has not been able to be reproduced by my Toyota dealership. It goes off right when I turn the car on 50% of the time and is very inconsistent. Wipers typically go off after using the turn signal, making long turns (such as into a parking spot), and driving on long curved roadways. It has been inspected and nothing has been found. There are no warning lights or messages.

Driving on highway around 65mph, car shut down internally completely blacking out inside. Turned back on a few seconds later while still driving all lights were blinking. Pushed the sos no-one answered pushed again then someone came on. Matches the same description on the other 2025-26 hybrids in the Corolla cross and camry hybrid.

See all problems of the 2025 Toyota Corolla 🔎.

Sos is malfunctioning. Rebooting every thirty seconds. Interferes with handfree phone calls messages pop up asking to call for operator. Google this and it very common. The sos is for emergencies to get you help and it cuts off every thirty seconds. Your phone calls. Were the person you're talking to cannot hear you until it stops.

When I use blinker windshield wipers turn on and sometimes when I call or somebody calls my cell phone I can hear them, but they cannot hear me. Does not happen all the time, but I was concerned since there was a recall on certain Toyota Corolla that says a short circuit may develop in the OCS sensor, preventing front passenger air bag from deploying and my son who is a mechanic said both of these could be a problem with the wiring in the column and I thought it may be connected to the same recall as the air bags? the wipers coming on is happening more often these days and that is why I mentioned it to my son who is a mechanic. He will not touch it since it is still under my extended protection but he is concerned about it getting worse since the blinker is attached to the column. As far as using not being heard by callers or when I call I am concerned if I need to call in an emergency the ones I call cannot hear me. As far as when this started I do not remember but I know it's been at least 6 months if not longer, it just seems to be doing it more often lately.

The navigational systems shuts off in the middle of driving. The screen will go completely black making it unsafe when using navigational directions. The system also shuts off at the slightest pot holes. Windows also won’t work when trying to put them down from the drivers side.

The contact owns a 2020 Toyota Corolla. The contact stated that while operating the vehicle, the message "communication module failure" was activated. The cause of the failure was not yet determined. The local dealer and the manufacturer were contacted regarding the failure, but no assistance was provided. The failure mileage was 37,000.

Radio will constantly reset as well as the in-dash clock, and the tire pressure light will illuminate and flash. I found this appears to be a consistent issue with 2014, 2015, and 2016 Toyota Corolla's on youtube.

See all problems of the 2016 Toyota Corolla 🔎.

My vehicle was backed into while ì was inside of it in a parking lot. Due to my horn failing. , I was unable to alert the other driver to see me. The clock spring is what failed the first time at 95k they replaced it. I'm now at 147k and it failed again . Now I'm discovering that if it does not work, there's an electrical circuit failure and that the airbag will not deploy if I get in an accident. This is a serious safety issue and I feel Toyota should be responsible for it for the life of the vehicle . A horn should never go out. Especially if it not working will keep my air bag from functioning properly . 850 out of my pocket is way steep. The replacement part lasted half as long as the original part did when I bought the car that to me seems like a faulty part this should be obvious and they should just fix the problem cuz I might have to just consult an attorney should they choose not to. The attached photo shows what happens when you can't beep your horn at somebody who's about to back into your car !!! my car still has not turned on any kind of warning lamp for the airbag or any kind of malfunction light, no warnings on my radio. I have noticed that my lane departure warning seems to work intermittently along with the automatic high beams that like to flash my high beams in people's face for some unapparent reason which also seems like a safety issue. If I had to take my car to an inspection station it would not pass an inspection due to the horn not working ! you cannot take your child to the department of motor vehicles and let them take their drive test if your horn does not work ! which happened to be my case !! very disappointing to say the least especially when you've paid $30,000 for a car.

The driver seat belt dont work and once in a great while it will work but even whenever it does latch it still shows the seat belt isn't on and that noise keeps going off but after a while the noise goes off but the symbol is still on the dash board. I recently got hit from behind (09/15/2025) at a red light and no air bags deployed. Im not sure if they were suppose to deploy but either way my seat belt dont work. And I know this isn't a safety matter but my radio doesn't turn off when I turn off my car and I can't lock/unlock my doors with the key fob I have to lock it with the key on the driver door. I have to take the fuse out for the radio so my battery won't die and so the radio turns off.

My 2021 Corolla showed an engine maintenance required message. This message pertains to replacing the engine coolant bypass valve - a common occurrence for the 2019-2023 Corolla/rav4 models. I have seen multiple instances online of complaints of this same issue around the 50k-60k mark of the vehicle. This should be a recall due to how common the problem is. I’m here to add on to that tally of complaints that have already been submitted.

After shortly pumping gas, I received a alert on my car that I needed to check my fuel cap, after checking fuel cap I proceeded to drive on the highway during this time a multitude of sensors started to go off on my car, and it started to drive weird there were light such as my interlock, being deactivated, parking, brake, deactivated, malfunction of vsc, collision deactivated. Then suddenly while driving at an accelerated speed, and trying to slow down, my engine turned itself off, and I was not able to re-crank my car. There is an active recall with Toyota for the fuel pump, which I was told by Toyota was the issue, but due to my VIN not being associated they would not repair as a recall.

The contact owns a 2022 Toyota Corolla. The contact stated that while the vehicle was stationary, the emergency button failed to respond. There were no warning lights illuminated. The contact then contacted the manufacturer and was informed that the contact needed to pay additionally for a subscription, for the feature on the vehicle to function. The vehicle was not taken to be diagnosed. The vehicle was not repaired. The dealer was not made aware of the failure. The manufacturer was made aware of the failure. The failure mileage was approximately 58,000.

I just had to replace my transmission. 2 days later I have my check engine light, secondary collision, pre collision and parking brake malfunction lights came on. There is a osc recall that could cause these issues, but they’re saying stated my specific vehicle isn’t under a recall.

Beginning on April 18, 2025, my 2020 Toyota Corolla le began experiencing repeated failures involving multiple safety systems while driving. Without warning, several lights illuminate at the same time, including: brake system malfunction, pre-collision system, parking brake system, vehicle stability control, check engine, and secondary collision brake system. These warnings appear suddenly during normal driving, then sometimes disappear, then return again unpredictably. These failures disable several integrated safety systems and create a serious safety risk due to changes in braking performance, loss of stability control, and disabled collision-avoidance functions. Diagnostic scans from both the dealership and an independent mechanic repeatedly show: p1578 — brake system malfunction p265b — rocker arm actuator position sensor circuit range/performance (bank 1) both codes reappear even after being cleared. The vehicle was with loving Toyota lufkin, TX multiple times over seven months. They received over $7,100 in insurance payments for repairs, $463 towing cost (due to the negligence of loving Toyota) and almost $1,500 in rental cars (paid by state farm) but were unable to diagnose or fix the underlying failure. Loving Toyota also provided a courtesy rental for 7+ weeks while they did no repairs to the car. The safety warnings continue to occur. Toyota corporate is now involved but the vehicle remains unsafe to drive. The same code p265b is present that was present back in April 2025. This car is not safe! the problem has been reproduced by me, the dealership, and an independent shop. The vehicle is available for inspection. All scans, photos, videos, and documentation are available upon request. Date first occurred: April 18, 2025 issue continues intermittently to present day.

On March 12, 2025, I was involved in a frontal collision when another vehicle unexpectedly pulled out in front of me. Impact occurred to the front-left area of my vehicle. Despite the nature of the collision, the front airbags did not deploy. The vehicle is subject to safety recall 20ta03, which addresses incomplete or non-deployment of airbags and/or seat belt pretensioners due to ecu susceptibility to electrical noise in certain crash scenarios. The vehicle was declared a total loss by my insurance company and is no longer available for inspection. The manufacturer was notified in may 2025 and again in November 2025. The manufacturer closed the case citing inability to inspect the vehicle and later relied on photographs only to rule out airbag deployment concerns. No warning lights or messages related to the airbag system were observed prior to the collision. The non-deployment of the airbags placed my safety at risk during a frontal impact.

See all problems of the 2014 Toyota Corolla 🔎.

The contact’s mother owns a 2020 Toyota Corolla. The contact stated that while looking in the list of features on the infotainment center, the forward collision, brakes, accelerator, lane assist, on-board collision, and other safety features were flagged as malfunctioning. The contact stated that the list of malfunctioning systems seemed to have increased over time. The vehicle failed to turn off intermittently, causing the driver to make several attempts to turn off the vehicle. The vehicle was not taken to the dealer to be diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was 80,000.

My 2021 Toyota Corolla's engine coolant bypass valve has shorted out once again. This is the second time this has happened in less than 40,000 miles. The vehicle has been inspected by two different dealers one two separate occurrences for the same issue, even after replacing the failed equipment.

While turning left out of a drive through my the steering locked up and shot to the left causing a run up on the curb. However after a second or two it cleared. Upon shutting the car off and restarting driving in a parking lot same problem occured steering wheel shot to left causing me to almost loose control then all electrical power was lost in the vehicle. The steering wheel fault came up on the dash and would not let me control the wheel.

See all problems of the 2017 Toyota Corolla 🔎.

While driving, my vehicle gas pedal becomes unusable, and two warning messages appear on the dash "charging system malfunction" & "low oil pressure" forcing me to pull over in traffic to restart vehicle. This has happened to me 9 times already in a span of 2 weeks. This same issue has happened to a few others and one stated "unfortunately the techs at the dealership couldn't figure out the issue as no errors were popping up when they hooked up the car to get a read out, so they called in a Toyota rep and even he couldn't figure it out. " and later stated, "I've heard from 5 other people who had the same thing happen with their Corollas; one lady was even driving on the freeway when it happened to her. I reported the issue to the NHTSA and can only hope that enough people did the same so that Toyota is forced to deal with the issue. " I am experiencing the same issues as this owner and this needs to be investigated!.

I am experiencing a recurring issue with the data communication module (dcm) in my 2020 Toyota Corolla. This component was previously subject to a recall, which I addressed at a dealership. However, the problem persists, and many other Toyota owners, including those with rav4 models, are reporting similar issues. Discussions on forums such as Toyota nation and Toyota owners club highlight these ongoing concerns. My vehicle is out of warranty, and replacing the dcm is estimated to cost over $800. I have confirmed that the issue lies with the dcm system, as removing the corresponding fuse eliminates the error message on the multimedia system. However, this circuit also powers the right speaker and microphone, making it impractical to simply disconnect the module. The local dealership has quoted $205 for diagnostics, despite my prior identification of the problem. Revisiting the original dealership where the recall work was performed is not feasible, as it is located across the country. Toyota has not offered a remedy, leaving me without an affordable or practical solution to address what appears to be a manufacturer fault. I am seeking assistance and accountability for this persistent and widespread issue. . Read more...

Car would not start/turn over - not battery related. Toyota determined the ecu went bad and stated the cause was improperly jumping the battery. The issue happened randomly one day (car was driving fine previous days).

To start, on [xxx], I was going through an intersection on a country road and my automatic emergency braking engaged for no reason. My car stopped despite no other vehicle or object being in my way or anywhere close to me. I found it really weird but did not think much about after the fact. I have also heard a rattling noise under my hood since [xxx] and have reported this to Toyota and tried to have it fixed multiple times (and showed them videos) but they were never able to duplicate the noise so it has not been remedied. On [xxx] I was traveling on a highway during rush hour and the traffic in front of me came to a sudden stop. I braked as hard as I could; my automatic emergency braking did not engage and I rear ended the car in front of me (minimal damage to that car). We both immediately pulled partway onto the narrow left berm (we had both been in the left lane to get onto another highway). My car then turned off by itself and gave me an engine warning (I believe low engine oil- I had just had it serviced 3 days prior). The other car owner and I exchanged information quickly and decided to drive away because we were blocking rush hour traffic and it was dangerous. However, my car would not start back up. I called 911 and they came to use their vehicle to push me to the right side of the highway onto an exit where I was no longer blocking traffic. During the wait, I felt like I was going to die with traffic honking and swerving to avoid me. When the police officer was moving my car, the parking brake engaged when I put the car in neutral and would not turn off, so the smell of burning rubber was strong since the tires would not roll. Once the tow truck driver arrived he was able to use jumper cables to disengage the parking brake but the car still would not start. There were no prior warning lights. The car not starting was confirmed by the dealer- they are holding off doing maintenance to have an engineer check out the car and figure out what happened. Information redacted pursuant to the freedom of inf.

See all problems of the 2023 Toyota Corolla 🔎.

The vehicle flashes ‘connected device is not compatible’ with the ‘sos button flashing continuously red then green. ’ this message causes the microphone to remove 1 to 3 seconds of sound every 5 to 15 seconds making a clicking noise when speaking on vehicles bluetooth. This is typically corrected by a dcm reset and firmware update. Not only is this incredibly inconvenient during normal conversation but having to repeat random portions of the conversation is irritating at best. Recently I had to make a 911 call and had to repeat myself several times to request emergency services. This glitch caused the emergency 30 second call to be extended roughly 1 1/2 to 3 minutes delaying response time. If the clicking occurs while the other person is speaking this is not noticeable. This is an identified issue only covered under basic warranty with specific TSB correction. This defect causes portions of vehicle occupants conversation to be removed and replaced with a clicking noise.

When using built in carplay navigation the gps will start drifting 10-20 feet from the highway into field or other highways causing it to reroute constantly. When phone is disconnected from carplay during the gps drifting current location will go back to right location on the phone. We tried connecting different phone to Corolla all had the same issues. My other two cars don’t have this issue using the phones. Dealers won’t address the issue.