2024 Toyota Sienna Hybrid: false forward collision warnings

Filed Oct 30, 2026 · Brakes, Driver assistance · CA · crash

While driving at very low speed on a residential street, my wife was braking when our Sienna struck an unoccupied parked Toyota Tacoma with the right front corner. She believes she was braking and the van did not slow as expected. The pre-collision system did not brake or warn. We have repeatedly noticed the van surge or lurch forward while braking at low speed, such as when pulling out of our driveway. We are aware of Toyota service bulletin T-SB-0047-24 on brake surge in 2021-2024 Sienna hybrids. Damage includes the right front structure, hood, fender and headlamp, with repairs estimated at about $19,900. The vehicle is currently at a body shop (Haws Auto Body, Lafayette, CA).

Filed Aug 26, 2026 · Brakes, Driver assistance · GA · crash

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.

Filed May 20, 2026 · Driver assistance · 25,000 miles · NC · crash

The contact owns a 2024 Toyota Sienna. The contact stated that while approaching a stop light and pressing the brake pedal the vehicle crashed into the rear of a second vehicle. During the crash the collision avoidance system did not activate and no air bags had deployed. No injuries were reported. A police report was taken at the scene.. The failure mileage was 25,000.

Filed Mar 14, 2026 · Acceleration, Engine · MD

While driving on highway, on 3/11/26, car powered down. I had to coast to side of highway. I was able to turn vehicle on after several minutes, but SEVERAL system malfunction error messages (hybrid, accelerator, pre-collision, tpms, airbag, engine…) appeared. The vehicle would not accelerate beyond 10mph. Once I moved it to a safe location, I had the vehicle towed to the dealership. The dealership technician was able to replicate the issue during test drive. The technician apparently had the vehicle towed back to the dealership last night. The car has had other related issues since June 2024 when I bought it. The TPMS system, the accelerator system, and the airbag system have all malfunctioned independently. The accelerator system malfunctioned in Jan. I had to pay for a replacement fuse despite the warranty. The vehicle is modified with Braunability equipment for wheelchair access. These modifications are approved by Toyota and were completed by MobilityWorks. Aside from the vehicle itself being unsafe to drive, the passenger sliding door has had numerous problems. On 3/07/26, the door mysteriously slammed shut after opening and would not open again. These are all dangerous situations that could have resulted in fatal accidents.

Filed Aug 27, 2024 · Acceleration, Driver assistance · CO

When crossing a one-way road with oncoming traffic from the left, a vehicle that has recently passed might be triggering the forward collision avoidance system which cuts off throttle control to the Sienna, even when the passed vehicle is well out of the way. It is unknown if the collision avoidance feature is being triggered as there are no warning lights or messages in the display. This results in the Sienna having no accelerator response and sitting “dead in traffic” sideways in front of oncoming cars. This this is the second time this issue has occurred and today I was nearly t-boned by on-coming vehicles as there was no throttle response to move the car forward. This issue has been reported in 4th generation Sienna (‘21-‘24) forums on Facebook. This issue puts at risk vehicle occupants as well as other vehicles on the road.