2023 Toyota Highlander

Ongoing severe engine surge after coasting while braking lightly during moderate downhill drives on pavement. It happens consistently with different drivers at speeds between 25 to 45 mph. The surge can cause the vehicle to lurch forward enough to move the vehicle forward suddenly, and rapidly to other cars ahead. This is an unpredictable issue, but occurs multiple times daily. Very concerning for everyone at risk in the vehicle. This issue was presented to several Toyota dealers in the San Diego (Carlbad, CA) and Temecula, CA areas during routine servicing during new car regular servicing up to 36k mi. It was documented at those dealers 4 times. They could not reproduce it until the 4th service appt at Temecula, CA Toyota. Toyota has a remedy for previous years' models of Highlander Hybrid, which was a software upgrade to the hybrid braking/engine system. But not the 2023 year. Yet.

2023 Toyota Highlander Hybrid Regenerative Brake Transition loss of brake pad pressure resulting in acceleration of the vehicle under downhill conditions. Have momentarily experienced the loss of braking frequently during braking when going downhill. This results in the vehicle gaining speed during this 1 or 2 second period before braking returns. In one case it allowed our car to get dangerously close to the vehicle ahead of us but fortunately I was able to push the brakes harder to prevent an accident but did require aggressive braking. Luckily no one was behind us which may have resulted in the person following us braking hard or possible hitting us. This was a known issue for previous year Toyota Highlander models and Toyota issued service bulletin T-SB-0059-23 which is stated to only be for model years 2020 - 2022. So, Toyota dealers say they do not have a fix that applies to the 2023 model. It has been indicated that the dealer is unaware if any action is being taken by Toyota to address this issue in the 2023 and later models. We have multiple people driving this vehicle and this sudden loss of braking power is very concerning. The loss of braking force occurs upon the transition from regenerative braking to standard hydraulic breaking. Below are words from the Toyota Technical Service notice concerning the problem. "Highlander Hybrid vehicles may be sensitive to the momentary transition from regenerative braking to hydraulic braking under certain driving conditions, such as while driving downhill, or turning with light brake pedal application. The brake actuator control module can be updated to improve brake feeling for this condition. Follow the Repair Procedure in this bulletin to address this condition."

When applying brake, in sporadic and unpredictable circumstances, the vehicle seems to switch from regenerative braking to brake pump braking. During this switch, braking power is lost completely. The vehicle was inspected by the Dealer, they stated no issues found / unable to reproduce. This issue, if unresolved, increases risk of vehicle collision. No warning lights, no messages, no other symptoms of the problem. This issue has been present for ~1.5 years.

The brakes on this vehicle disengage and re-engage at will during braking. There are no indications of when it will occur. Brakes will disengage during low and high-speed braking, braking while going uphill, downhill, on flat roadway or during turns. This has resulted in several near miss accidents as well as debris was struck in the roadway due to being unable to stop. This vehicle was purchased new from the dealership in NM and was reported to them starting at 18,000 miles. Vehicle has been taken to numerous dealerships and reported with them as well. Toyota's answer is this is normal. Brakes disengaging and resulting in near accidents is not normal. It is now pending formal inspection from Toyota corporate by dealerships dismiss the problem as unable to replicate. This is to the point where we only drive when absolutely needed due to fear of an accident as this is the only vehicle.

2023 Highlander Hybrid braking suddenly changes at low speeds when coming to a stop. Vehicle's brakes work properly (Regenerative and hydraulic combined) until it slows to make a stop or slows in heavy traffic. Suddenly the brake pressure changes and the vehicle "lunges" forward and brake pedal must be pressed extremely hard to stop or slow the vehicle. Problem happens most often when on a hill approaching a stop. Toyota dealer initially said that they never heard of such a problem until I presented them with T-SB-0059-23 Hybrid Regenerative Brake Transition Feeling Improvement for Model years 2020 thru 2022 from Toyota's website. I had reported the issue 3 times before (twice while in warranty and documented by them once while in warranty) but they claim that there is no fix available and when and if one comes available it will only apply to vehicles with 36,000 miles or less. LOOKS like Toyota and this dealer could care less about SAFETY and its customers.

When applying the brakes sometimes, particularly when breaking at the bottom of a hill, the car lunges forward before the brake catches and it stops. The transition is jarring and does not seem safe at all. I've been told by mechanics at the Toyota shop that it is normal for a hybrid vehicle, but if that is the case they need to not sell hybrid vehicles or find a way to avoid this problem. I've read tons of posts on online forums confirming that many other people have this with their Toyota hybrid vehicles, including the Highlander.

Since I got this car, when going down hill the breaks don't work properly. It is a sudden surge and the car takes a few extra seconds to break. It happens often and I always need to keep a good distance from the car in front of me to avoid a collision. I brought up during service to my Toyota dealership but they don't have a solution. Nothing shows up in the panel, the car just launches forward.

My 2023 Toyota Highlander has had an issue where the steering wheel and brake pedal vibrate when braking at around 25 mph and higher. The car will also vibrate. This happens on the highway mainly but also on 25+ speed zones in residential areas. I have taken my car for regular maintenance and the brakes have always checked out fine. There has never been a service report stating anything is wrong with the rotors. I have purchased new tires and have had them aligned and balanced and the issues still persist. When I reported this to Toyota Service I was told that my brakes were good. The problem still persists.

There is a wobbling sensation on my Highlander during braking at highway speeds. There is no such feeling while driving around city. It appeared after my trip on highway in heavy rain. There was no traffic, and I were using cruise control. Suddenly, doing nothing from my side but steering, I started to feel heavy break impacts, which scared me (I was with my family). I switched off cruise control, and those break impacts disappeared. Then switched it again, and I started to feel the same, thus I switched off cruise control and drove the rest of rain area with my foot on accelerator pedal. After that I started to feel wobbling during braking at highway speeds. It seems - more on the right side. Maybe there was more water layer under the right side of the car, and the Electronic Stability Control tried to hold car on the straight line, or camera detect water on the windshield as an obstacle and applied breaks from time to time, which might case warped rotors. To my understanding it has to be warranty issue, as Toyota manual said that driving during heavy rain can cause unproper action of cruise control, but it does not say it can damage the car or warp the rotors.

Randomly when braking the vehicle will "lurch" forward causing you to immediately reapply the brakes hard to stop. The dealer claims they have no knowledge of this but when you Google "Toyota Highlander hybrid brake issues" there are numerous reports of the same occurrences. This creates a serious collision potential issue with a vehicle stopped in front of the car. It is available upon request for inspection. It has not been confirmed by the dealer but I am happy to do so. It happens without warning.