还有人有转向系统的问题。

https://www.carcomplaints.com/Toyota/Sienna/2011/steering/steering.shtml

https://repairpal.com/the-power-steering-eps-in-our-2011-toyota-sienna-is-dead-391

You can try to collect more information and connact with Toyota to fix it for free. This looks like their design or quality issue, should take care of your problem. And this is good for Toyota for further huge cost.

Good luck!