2024 Toyota Sienna Hybrid

My name is [XXX]. I am an automotive Technician and I have completed hybrid vehicle system training. I have a certification of completion for the hybrid training.I work for XXX [XXX] maintaining and servicing a fleet of vehicles. I am contacting NHTSA regarding a safety concern with a 2024 Toyota Sienna Hybrid that I inspected. The vehicle has an intermittent braking concern. The driver reported that while braking, the vehicle sometimes seemed to move or jump forward instead of responding normally to the brake pedal. On one occasion, the driver reported that the brakes did not respond as expected and the vehicle nearly proceeded through a red light. I inspected and road tested the vehicle, but I was not able to duplicate the problem at that time. I also performed a full system scan and found DTC P162B87 in the Hybrid Control system. I contacted a Toyota dealership regarding the concern and also asked about Toyota T-SB-0047-24, which appears to relate to a transition between regenerative and hydraulic braking on certain Sienna Hybrids. The dealership told me that the bulletin does not apply to this vehicle’s VIN. Because this is an intermittent braking concern that could potentially affect vehicle safety, I would like to report it to NHTSA and find out whether there are other similar complaints or any additional information available regarding this issue. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11766679

Incident

Sep 14, 2026

Three (3) separate systems failed. 1. Upon seeing cars ahead of us slowing down, my husband pressed the breaks to slow down to avoid collision. When he pressed on the breaks, instead of slowing down or stopping the vehicle, the brakes failed to engage, and caused a surge that compelled the vehicle to lurch forward. The lurch propelled our vehicle into collision with another vehicle. 2. Also, the forward collision warning system failed to alert or engage the breaks. Our vehicle was stopped by the impact of hitting the other vehicle, not by its own breaks. 3. The automatic breaking system also failed to engage at all prior to impact.

NHTSA ID

11759813

Incident

Aug 26, 2026

The contact owns a 2024 Toyota Sienna Hybrid. The contact stated that while driving at an undisclosed speed, the hatchback independently opened. No warning lights were illuminated. The vehicle was taken to a dealer where it was diagnosed and determined that the hatchback needed to be recalibrated. The vehicle was repaired; however, the failure persisted. The vehicle was taken back to the dealer where it was diagnosed and determined that the hatchback needed to be recalibrated. The vehicle was repaired; however, the failure persisted. The vehicle was taken back to the dealer again and was diagnosed and determined that the hatchback needed to be recalibrated. The vehicle was repaired; however, the failure persisted. The manufacturer was notified of the failure. The failure mileage was approximately 15,000.

NHTSA ID

11757786

Incident

Apr 15, 2026

Mileage

15,000 mi

I have never been in an accident in my 31 years of driving. However, I am worried that this van is going to cause me to be hit. Several times I have pulled out to make a left or right turn and my gas pedal does NOTHING. I can push it clear to the floor and NOTHING!!! Cars end up slamming on their brakes and honking at me but there's nothing I can do. This is EXTREMELY scary and a HUGE HUGE HUGE manufacturing flaw. There needs to be a recall for this to be fixed before people are injured.

NHTSA ID

11754568

Incident

Feb 19, 2024

Unexplained acceleration during braking which has caused the vehicle to appear to accelerate further during braking actions causing driver to apple brakes harder

NHTSA ID

11751146

Incident

Jul 13, 2026

Rear Tail Lights Failed... Brake and Signals work. This was repaired through the dealership. 4 connectors and housing replaced invoice shows part 909890-10942. I am writing to express my concern regarding repeated tail light failures on my black Toyota Sienna that appear to be caused by wiring connection issues. This defect creates a serious safety hazard for my family, other motorists, and pedestrians, particularly in rural areas where there is little to no street lighting. I live in the country, where many roads are unlit and visibility at night is already limited. Because my vehicle is black, it blends into the darkness when the tail lights fail. Drivers approaching from behind may not realize my vehicle is on the road until it is too late to stop safely, significantly increasing the risk of rear-end collisions. This issue is especially concerning because I frequently transport children in my vehicle. Their safety depends on other drivers being able to clearly see my vehicle at night. A tail light failure caused by a wiring defect could place them at unnecessary risk of serious injury or death if another vehicle is unable to see us in time. The defect also puts other drivers at risk. Motorists traveling at highway speeds on dark rural roads rely on tail lights to judge the presence, distance, and speed of vehicles ahead. Without functioning tail lights, they may have little or no warning that another vehicle is in their lane, particularly around curves, hills, or during poor weather conditions. This appears to be more than a routine bulb replacement issue. If the root cause is an unreliable wiring connection, the lights may work intermittently or fail unexpectedly, making it difficult for owners to recognize the problem before driving. An intermittent electrical failure is especially dangerous because drivers may believe their lights are operating normally when they are not. Started a case with Toyota 260715001670

NHTSA ID

11750825

Incident

Jul 4, 2026

Moving about 55 miles per hour on right lane of I-95 the Jeep in front of me braked abruptly. I braked hard but as my Sienna was quickly slowing down to stop, the brake pad felt spongy when it was slower and as I pressed even harder, it seemed to have stopped decelerating at that slower speed and that was when my Sienna slammed into the back of the Jeep. Happened today on July 15, 2026 at around 4:24 EST. I will also file this same report to Toyota. My wife and I are at the hospital getting checked, but my Sienna looked undrivable.

NHTSA ID

11750717

Incident

Jul 15, 2026

The power liftgate on my 2024 Toyota Sienna consistently fails to complete a full close-and-latch cycle. When activated, the liftgate begins its closing sequence normally but then aborts the cycle during the final stages of latching. The system emits an audible beeping signal and the liftgate reverses direction, reopening approximately one-quarter of the way. This failure occurs repeatedly when the vehicle is stationary with no external obstruction present. Multiple repeated attempts to close the liftgate using standard operation (key fob, interior switch, and exterior switch) result in the same failure pattern. The system does not complete a secure latch. Eventually, the liftgate can only be fully closed manually with physical force, bypassing the powered closing function entirely. This condition occurs intermittently at times but has become frequent and repeatable enough to prevent reliable use of the power liftgate system. No obstructions are present during operation. The local Toyota dealership service department observed this and indicated a lift gate adjustment is required, noting it is a known issue Toyota Customer Care has indicated they have no documented record of a known defect relating to this condition. However, multiple independent owner reports and dealer-level discussions indicate similar behavior may be occurring in other vehicles of the same model line, suggesting a potential systemic issue that may not yet be formally recognized. This malfunction raises potential safety concerns, including but not limited to: failure of the rear liftgate to fully secure and latch, increased risk of the liftgate remaining partially open or unlatched without clear driver awareness, and reliance on manual force to override an electronic safety system designed for automatic secure closure. I request that this complaint be documented for investigation and review to determine whether a defect trend exists in the power liftgate system of the Toyota Sienna platform.

NHTSA ID

11746650

Incident

Jun 17, 2026

This bulletin includes basic procedures for performing a rescue charge at battery on high voltage (HV) Ni-MH and Li-ion batteries.

OBSOLETE NOTICE August 20, 2026: This bulletin is now obsolete. Please see T-SB-0051-26.

Although the HV Floor Under Wire Harness and Rear Traction Motor Cable is covered by Toyota’s New Vehicle Limited Warranty for 3 years or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is providing extended coverage under this Customer Support Program for repairs related to excessive corrosion to the wire harness connections at the Rear Motor Generator. Excessive corrosion can cause AM Radio Static during certain drive cycles, or the vehicle may not start.

OBSOLETE NOTICE February 27, 2026: This bulletin is no longer applicable and is now obsolete.

OBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T-SB-0001-26.

Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software.