Toyota
Highlander

On or about Oct, 3rd, 2025 , my vehicle experienced the 'Check Engine' light and all the warning lights lit up, the hybrid system failed to engage, the vehicle would say “park somewhere safe /take to dealer” . I immediately took the vehicle to the authorized Toyota dealership, Wonderies Toyota Alhambra , for diagnosis. They said they could not find anything, reset the sensors, and told us to come back if the problem persisted, and one hour later the system lights lit up again. We returned the same day and the dealership informed me that the issue is a severe corrosion of the underbody wiring harness , specifically citing external damage or 'spillage' as the cause. The estimated cost for a complete replacement of the wiring harness is approximately $6- 7,000.00. I contend that this corrosion is not the result of customer spillage but rather a manufacturing defect related to inadequate design, covering, or routing of the wiring harness, which makes it highly susceptible to road hazards, moisture, and environmental contaminants. Crucially, this issue appears to be covered under the Toyota Limited Service Campaign (LSC) related to wiring harness deterioration (LSC25TD01 / LSC-J02). Toyota states my vehicle is not covered however Toyotas own website states the Highlander HV 2024 has been added recently in Sep.2025 . I request that NHTSA review my case in light of this known issue to determine if the defect presents an unreasonable risk to safety and to urge Toyota to properly remedy this problem under the terms of the applicable coverage or warranty enhancement. I formally request that Toyota honor the spirit of the Limited Service Campaign LSC25TD01 and cover the full cost of the replacement wiring harness and labor. [XXX] [XXX] [XXX] [XXX] [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

UNKNOWN - 2024 Toyota Highlander makes a drumming or hooting sound when driving over normal to slightly rough roads. It is not related to expansion joints in the road. 1st dealer said it was a rt. wheel bearing, changed it and it did not work. He then said it was in all Toyota's with 20" wheels. I paid to change tires and wheel to no avail. 2nd dealer said it was normal even though mechanic heard the noise. His supervisor said it was fine and they would do nothing to try to isolate the noise. Noise is very obvious.

>While exiting a highway my vehicle surged forward crashing into the vehicle in front of me.Engaging the brake, my car smashed into the van again. I had no control over the forward momentum of the car. >Both the driver & I were in danger of injury >The problem has not been addressed as my damaged car is being repaired >The vehicle has not been inspected >I was given no warning that the incident was forthcoming

Ours has pulsing brakes and brakes feeling "off" at low speeds, potentially due to the interaction of regenerative and conventional braking. The brake pedal will also suddenly jolt the car forward when switching between braking systems. The system is unsafe.

There are many times over the course of the past few months where I am braking and the car lurches forward at least a few inches before coming to a complete stop. It feels as if it is being rear ended at a slow rate of speed. I have not been able to identify any pattern in this problem. It happens when I am braking to slow down at a faster rate of speed or when I need to come to a complete stop at a stop light or sign. This is very dangerous as I fear that one day when I need to brake I will not be able to and will hit something as the car keeps moving several inches after braking sometimes. I have brought the car to the service department at the dealership and they have told me that it is normal and there is nothing that they can do about it as they were unable to replicate it. However, that makes sense as it does not happen all of the time, but rather inconsistently. There have been no warning lamps or messages and the dealership has confirmed that there are none showing up when they check it on their end.

My driver side rear door handle comes off when I open the door. I am having the dealership look into this on 8/28/2025.

While slowing down, the vehicle will suddenly lunge forward, as if It hit a patch of ice and then slow again. This started happening around 30,000 miles. The dealer said this is because of a transition between hydraulic braking and regenerative braking and is "NORMAL". This did not start until 30k miles. I have owned 4 hybrid vehicles and only this one does this. Upon reading and studying online, there was a bulletin for an earlier generation of this type of problem. Clearly, it is an issue as I am not the only one with this problem.

when I attempt to accelerate from a stop, or slowly rolling, there is a 2-3 second delay, sometimes longer, prior to the vehicle moving forward. during the delay, when accelerator is pressed, the engine does not rev, nothing happens at all. it's scary. the highlander has less than 9k miles on it. this has been happening more and more frequently. I have contacted toyota, they have yet to provide a response or solution for this safety issue.