Two problems related to brake sensor have been reported for the 2008 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Toyota Sienna based on all problems reported for the 2008 Sienna.
Tl the contact owns a 2008 Toyota Sienna. When the contact switched lanes or made a turn, the brakes activated on their own. The failure occurred on flat or curved roads and while driving 30 mph. Sometimes the brakes worked properly, but sometimes they did not work at all. The contact also stated that the vehicle would occasionally accelerate and decelerate on its own and the steering wheel made an abnormal ticking noise. Furthermore, the vsc and traction control indicators illuminated. The vehicle was taken to Toyota knoxville (10415 parkside dr, knoxville, TN 37922), but they did not assist. The vehicle was then taken to fox Toyota (228 fox family ln, clinton, TN 37716) where it was diagnosed that a steering angle sensor needed to be installed. The vehicle was not repaired. The manufacturer was made aware of the failures and provided a case number. The failure mileage was 170,000.
While driving the vsc/abs system comes on unexpectedly causing vehicle to brake and effect steering. It is most frequently noticed when steering on curves 30-40 mph. I have replaced tires, front steering components and dealer cannot duplicate. I believe wheel speed/yaw sensor calibration is affecting the vsc system. This is a very scary situation to be in that could lead to a serious accident. Your braking and steering affected all at once unexpectedly is dangerous. Please investigate and provide solution ASAP.