2021 Toyota Highlander

The contact owns a 2021 Toyota Highlander. The contact stated that while driving at various speeds and depressing the accelerator pedal, the contact heard an abnormal whining sound coming from the front of the vehicle. The vehicle was taken to an independent mechanic, where the contact was informed that it was a known failure. The vehicle was then taken to the dealer, where it was diagnosed, and determined that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and advised the contact to work with the dealer to have the transmission repaired. The failure mileage was 66,000.

There is a Technical Service Bulletin (TSB-0059-23) issued for 2020-2022 Toyota Highlander Hybrid models addressing a braking issue. It happens every day. There are a lot of issues Some drivers reported a momentary transition from regenerative braking to hydraulic braking, particularly when driving downhill or turning with light brake pedal application. Toyota has provided a software update for the brake actuator control module to improve brake feel. If you own one of these models and are experiencing this issue, you can visit a Toyota dealership and request this specific TSB repair. Addendum: There is no charge for this fix if your vehicle is within the warranty period. The repair procedure under Toyota’s Technical Service Bulletin (TSB-0059-23) is covered by Toyota’s warranty, meaning the brake actuator control module reprogramming is performed at no cost to the owner.

I own a 2021 Toyota Highlander Hybrid. The vehicle exhibits a dangerous braking surge defect. When braking during cornering or in stop-and-go traffic, the vehicle randomly surges forward even though the brake pedal is depressed. This creates a serious safety hazard and increases the risk of collision. On multiple occasions, this defect has nearly caused an accident. The last time it happened we were driving in stop and go traffic and the vehicle surged forward while depressing the brakes and the engine died leaving a red triangle on the dash. Toyota has acknowledged this condition through Technical Service Bulletin T-SB-0059-23, which applies to my vehicle. The bulletin involves reprogramming the brake actuator assembly control module to address the braking transition between regenerative and hydraulic braking. Despite this, Toyota has refused to apply hybrid system warranty coverage, misclassifying the defect as a conventional brake issue. My vehicle is available for an inspection. I contacted Toyota corporate, who initially responded but failed to provide follow-up or resolution. The defect persists after the bulletin was applied. Toyota’s refusal to cover the repair under the hybrid warranty leaves me with an unresolved safety defect. This complaint is intended to document the ongoing safety risk and Toyota’s failure to provide adequate remedy under warranty. I request NHTSA investigate this issue as a systemic safety defect affecting 2020–2022 Highlander Hybrid models.

Failed seals on roof rack that allowed water to enter the A pillars. Unknown potential damage to air bag system, and electrical wiring. Smaller leaks can go undetected and damage components over time without owners knowledge. Dealer confirmed water intrusion, Toyota refused to repair the defect. Toyota is aware of the problem and had issued a service bulletin on April 22, 2024 (T-SB-0040-24) with a range of 2020-2023 Highlander vehicles affected. This defect may also affect components within the B pillars, and more.