2022 Toyota Redundant Sienna

My vehicle occasionally exhibits a behavior during low speed braking (such as approaching a stop sign or red light) where the deceleration will briefly cease in spite of constant brake pedal pressure. This lasts for less than a second before brake behavior returns to normal. To the driver, it feels like a sudden acceleration (but I believe it is a momentary loss of deceleration). -- This behavior is intermittent and difficult to reproduce on demand. It seems to happen more frequently: - At low speeds, when gradually slowing to a stop. - Un uneven pavement (such as a street with speed bumps or potholes). - On downward slopes. -- I strongly believe the problem is related to transitions between regenerative, engine and friction brakes in this vehicle. I believe Toyota has a systemic issue related to the design and/or implementation of the hybrid braking system on this and similar models. -- This is not a case of "you just need to get used to how hybrids work", it is a case of "I press the brake, I expect the vehicle to decelerate". If you review Toyota online forums for the current Sienna, Highlander and similar Toyota hybrids, this issue is extremely common and many owners are complaining, so far Toyota is ignoring the issue.

Our 2022 Hybrid Toyota Sienna will randomly have a loss of brakes for several seconds while in the middle of a stopping situation. The vehicle seems to lurch forward with the brake pedal going soft. After cramming my foot as hard as possible into the brake pedal I have been able to get it to stop so far, however my stop distance is much longer than anticipated. It seems to be getting worse in the past week with 2 of these episodes occurring. In the past year it has happened approximately 5 times. Each time is highly distressing. We have taken it to one Toyota dealership so far that could not find anything wrong with the brakes and have another appt in July with a second Toyota dealership. I find similar experiences described online from other 2022 Hybrid Toyota Sienna owners. I feel an obligation to report this because it is life threatening to be without brakes for even a few seconds while driving. There are no warning messages that appear when this brake failure occurs and it has not been reproducible.

Brakes release briefly when slowing to a stop. While slowing to a stop with steady pressure on the brake pedal, the braking action will momentarily give out, resulting in the vehicle lurching forward beyond the anticipated stopping/slowing distance before the braking action re-engages. This has resulted in near collisions with cars, bikes, and pedestrians as the vehicle suddenly stops slowing without warning and unexpectedly increases stopping distance. The problem is intermittent and difficult to reproduce, but has occurred repeatedly over at least 6 months of ownership. Going over any kind of bump, crack, pothole, etc seems to increase the likelihood of occurrence, but it also happens on dry, flat pavement. No warning lamps, error messages, or other related symptoms from the vehicle either before or after occurrences of the problem.

Over the past 18 months, this vehicle has exhibited the following actions approximately 30-40 times. When slowing the vehicle, with brake pressure applied, the vehicle reacts appropriately until, at the slow speed( approximately 5-10 mph) it suddenly accelerates or surges ahead for approximately 1-2 seconds. The has occurred while in the process of turning as well as moving straight ahead. I have taken the vehicle to the dealer of the original sale, Shepard's Toyota, Thomaston Maine, and they have attempted to replicate this action. They were unable to do so. The reported to me that they contacted Toyota engineering and was told, I paraphrase, that when the drive battery is fully charged and the dynamic braking system is still creating a charge, the current is directed to the drive motors, despite the fact that the brake is applied to slow and stop the vehicle. These events have occurred inn the middle of turns, when attempting to stop at crosswalks, and stopping prior to entering a traffic stream. If I had not continued to apply the brake, the vehicle would have, in several case, collided with objects.

This vehicle accelerate suddenly while it is slowing down even if I have foot on break paddle. I have complained to Toyota dealers but they said that hybrid vehicle operates like that. This is very dangerous and nobody is taking seriously. I do not believe that this works like that. I have seen so many people complain online about this problem in 2022 hybrid sienna. Please help.

When pressing the brake to come to a stop, the van will surge almost as if the brakes stop working. It happens just for a second but makes it feel like you won't stop in time. It definitely slows the braking down and may cause a crash. It has happened randomly and is unpredictable and cannot be replicated in a way that I know how to replicate. This has happened since new but has gotten worse recently. Van currently has 24,000 miles.

About five times now, when braking at slower speeds, such as at a light or parking, the car will accelerate and lunge forward or there will be a loss of the brake. My foot is depressing the brakes normally when this happens, but then I will slam harder on the brake to not hit whatever is in front of me. There does not seem to be any particular reason that causes this to happen, for instance temperature, and it happens randomly.

The contact owns a 2022 Toyota Sienna. The contact stated that while his wife was driving at 65 MPH, a loud sound was heard. Upon inspection, the contact noticed that the sunroof had exploded; however, the sunroof panel was closed, and no glass entered the interior of the vehicle. There was no impact on the sunroof that could have caused the explosion. The vehicle was taken to the dealer, and the dealer referred the contact to take the vehicle to Vantage Mobility International (VMI, 5202 S 28th Pl, Phoenix, AZ 85040) due to the wheelchair van conversion. The vehicle was taken to VMI, where it was determined that a small impact caused the sunroof to explode, and the sunroof needed to be replaced. The vehicle was not yet repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 750.

The contact owns a 2022 Toyota Sienna. The contact stated that the sliding doors inadvertently opened while parked with the doors locked. There were no warning lights illuminated. The contact took the vehicle to the dealer but was not diagnosed. The vehicle had not been repaired. The manufacturer was made aware of the failure and opened a case regarding the failure. The approximate failure mileage was 2,000.