2023 Toyota Sienna Hybrid

The contact owns a 2023 Toyota Sienna Hybrid. The contact stated while driving and depressing the brake pedal to come to a stop, the vehicle jolted. The vehicle was taken to the dealer, where the contact was informed that the vehicle was operating as designed. Additionally, the contact stated that upon starting the vehicle, the messages "Parking Brake Malfunction", "Parking Brake Unavailable" and "Door Ajar" were displayed. The gear shift indicator light and the parking brake warning light were illuminated. The vehicle was taken back to the dealer, where it was diagnosed that the main wiring harness underneath the gear shifter was corroded. The dealer informed the contact the wiring harness would be replaced at the contact's expense. The contact stated that the failure occurred because there was no protective shielding around the wiring harness. The vehicle was not repaired due to the cost. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 44,242.

The contact owns a 2023 Toyota Sienna Hybrid. The contact stated while driving at an undisclosed speed and turning the steering wheel there was an abnormal knocking sound coming from the vehicle. The contact stated that the sound came from the front and the rear of the vehicle. The vehicle was taken to the dealer twice; however, the contact was informed that the sound was due to normal wear and tear. In addition, the contact was informed that the vehicle was safe to drive. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was made aware of the failure but provided no assistance. The contact was advised to take the vehicle to another dealer for a second opinion. The failure mileage was approximately 52,200.

multiple times this has been an issue. I stepped on the break and the car essentially leaps forward typically when going up down or straight. In November 2024 it happened while going up a hill slowly and I bumped into the vehicle ahead of me. My vehicle had no damage, but the car in front of me had to get a new skid plate and my insurance doubled because of it. Since the incident in November 2024, my car has unintentionally accelerated intermittently. finally, April 2025 this happened my car started shaking jolted forward, engine revving, and then my check engine light came on then immediately contacted my local dealership and scheduled an appointment to get my car in. They have had my vehicle since then and have said it is not safe to give it back to me so I am currently driving a loaner vehicle.

The (PCS) Precollision System has been already set to LOW sensitivity, but every once in awhile when pulling in to oncoming traffic the vehicle would think there's still a car and just stalls for a few seconds (nonresponsive to acceleration pedal) leading to a dangerous occurrence where I could be hit by a vehicle because I've basically stopped in an active intersection. My vehicle is clean, so no dirt blocking the sensors, and I also own a 5th gen RAV4 without this issue.

The sunroof spontaneously exploded while in a closed position, not in use in any way, while driving in the rain on the highway. While driving at highway speed, a sudden “shotgun blast sound” occurred. The interior cover was closed. Wind noise became immediately apparent. Upon stopping to inspect, the exterior sunroof glass had shattered with the appearance it blew out from the inside, as the middle section was protruding upward. The sunroof has been used very minimally since purchasing the vehicle right at a year ago. There have been no issues with the sunroof. The vehicle is going to the dealership body shop in the next few days.

The brakes on my '23' Hybrid Toyota Sienna seem to have a sudden acceleration when braking at times. Typically, it happens when braking going down a hill or around a curve (at slower speeds) and sometimes when trying to come to a full stop. This has caused me to almost rear-end other vehicles on several occasions and has also caused me to go slightly beyond the stop sign, putting the nose of my car in the street. It is not reproducible at the dealership. It has happened since I drove it off the lot in July of 2023 and happens randomly and without warning. This is scary when you seem to be braking in plenty of time to keep safe distances and then you suddenly get propelled forward! It happens weekly and has happened weekly since purchase. In speaking with other owners, this sounds like a common issue.

The vehicle has a standard installation of a kick sensor for the rear hatch. I purchased the vehicle used and was able to start the vehicle and drive it for a period of time hoping to charge up the 12V battery. However, upon stopping the vehicle I could not restart it. Even after repeated jumpstart and driving the vehicle for over 45 minutes, the 12 V battery could not restart the car. I read about a similar issue with 2022 Toyota vehicles and so I followed the directions to disable the kick sensor. I then jumpstarted the car, drove it around and I found I could restart the car even after a short drive. I left the vehicle sitting in my driveway for two days and I could still restart the vehicle. I believe the 2023 Toyota sienna has the same issue as the 2022 model and the kick sensor needs to be replaced so it doesn’t drain the 12V battery when the sensor gets dirty. I live in the Midwest and this happened during January when there was snow and slush on the streets.