2021 Toyota Highlander

On August 24, 2026, my vehicle was parked, turned off, and locked for more than 6 hours in a parking lot. Without warning, the vehicle experienced a spontaneous thermal event/self combustion. The fire and thermal damage were entirely localized to the dashboard area inside the passenger cabin. The engine compartment, battery area and front mechanical components remained completely unaffected by the fire. The vehicle was off, motor was cold and car was closed and parked for about 6 hours when this incident occurred.

The transmission whining started 70,000 miles and it is progressively gotten worse, there has been some sudden shifting at times. The manufacturer has known about this 8 speed transmission. Problem since 2017 and they haven’t done anything to improve it. Isn’t is something that the warranty only covers the drivetrain and. Transmission till 60,000. And know they are telling us that we have to pay anywhere from $7,000-$12,000 to,have it replaced. We have taken it to the Toyota dealership Thayer Toyota in bowling green,oh and they checked it out. And said that the front part of the transmission is ok it’s but the rear differential is the one that is going bad. We are hoping that there will an investigation on this UA80 transmission to see how many of the toyota models that have this transmission in it, have been reported and if any after the 60,000mile they have covered to be repaired at there cost. We understand that there is a CLASS ACTION LAWSUIT against this transmission. We would appreciate any help that you can get us. We can be contacted at [XXX] or phone number [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

While driving and applying the brakes to come to a complete stop at low speed (approximately 5–15 mph), the vehicle intermittently loses brake responsiveness for a brief moment during the transition from regenerative braking to hydraulic (friction) braking. This causes the vehicle to lurch forward unexpectedly before the brakes fully re-engage. The issue is intermittent and unpredictable, occurring most often when coming to a stop at slow speed, which makes it difficult to anticipate and compensate for. This has happened more than a few times now, most latest, On XXX, this occurred while approaching a stop at traffic light and it felt that the vehicle nearly made contact with the vehicle ahead of me. I brought the vehicle to Elgin Toyota in [XXX] , in 2025 to report this issue. The service department test drove the vehicle but was unable to reproduce the symptom and did not perform any repair. I have since learned that Toyota issued Technical Service Bulletin T-SB-0059-23, "Hybrid Regenerative Brake Transition Feeling Improvement," dated XXX, which describes this exact symptom in 2020–2022 Toyota Highlander and Highlander Hybrid vehicles. I am filing this report because I believe this is a safety-related braking defect, particularly at low-speed stops, that creates a real risk of a rear-end collision. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

1. The car makes a squeaky sound when I accelerate. The faster I go the louder the noise becomes. I took the car to the Toyota dealership and was told that the transmission needs to be replaced. The car is only 5 years old. I checked online and noticed a lot of other people are also complaining about the same issue with their 2021 Toyota Highlander. 2. While driving on the Turnpike a few months ago, the driver side front door suddenly popped open on me. I had to hold it with my left hand, switched lane to pull safely to the shoulder lane in order to close it. The door was completely closed prior to this incident. When that happened, I was already driving on the road for over 1 hour. There was no previous signal that it was opened. It just popped open out of nowhere.

Toyota has known that the UA80 transmissions are faulty & they have not issued a recall. Mine failed at 60,500 miles just outside of the warranty period. I paid over $5,000 to have it replaced & the dealer confirmed that it required replacement due to a faulty transmission assembly. Toyota refuses to issue a recall or cover full costs for replacement.

The car's transmission is failing. •The "Whine of Death": The most common early warning sign is a high-pitched, airplane-like whining noise that rises in pitch with vehicle speed/engine RPM, especially once the transmission reaches operating temperature. •Technical Service Bulletins (TSBs): Toyota has issued internal bulletins (such as T-SB-0008-21 and related updates) addressing abnormal transmission noises and replacement protocols for affected V6 models. •No Formal Safety Recall (as of mid-2026): While the issue has spurred class-action lawsuits and high NHTSA complaint volumes, there has not been a mandatory safety recall for widespread replacement, leaving post-warranty owners to rely on goodwill assistance or third-party warranties.

My system information warning signal and chime indicates that an unbuckled passenger is present in my front passenger seat when nobody is there. Additionally, buckling the seat belt does not turn off the signal and chime. The sporadic signal and chime can continue for a very long time before eventually stopping. However, after another 30 seconds or so, it can start again. This cycle can continue for over an hour. It tends to occur more frequently above 35mph, but can also occur under that speed. From my research, this problem appears similar to another recall (Recall #23TA15 / Campaign 23V-865000), however my VIN currently isn't included in that recall.