Two problems related to software have been reported for the 2015 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Toyota Sienna based on all problems reported for the 2015 Sienna.
Van would reboot while parked or driving. It started with dashboard rebooting then I couldn't start the van. There was a time after driving I put the van in park and turned it off but my van was moving on it's own. I always call the dealership when the rebooting occurs. I was told either it was a software issue or since the problem went away, I should be fine. Well recently when my van stalled and had to be towed to the dealership. I was told it was a battery issue and the battery was replaced. When I picked up my van and went home, noticed my rear view camera would not come on went I put the van in reverse. Called the dealership to tell them what's going on and the service advisor woman was very rude and stated it was battery and they never checked anything else. I stated to the woman the I've always expressed my concerns about the van rebooting, won't start, or moving on it's own. The woman became very rude and hung up on me. I decided to go right back to the dealership on the way there I called back to speak to the manager of service department to explain what's going on. While driving there the check engine and another light turned on. Shortly after that as I was turning left, while in the middle of the intersection my van stalled. The steering wheel and brakes locked and the van completely shuts off. I was locked in my van with no control over the van and it was moving towards a pole. Luckily the van stopped before hitting anyone or anything. I was on the phone with the service manager the entire time. The manager called for someone to pick me up and called a tow company. I asked the manger if they are stating my issue was a battery and a new battery was installed why am I still having the same issue. The police was call because someone reported my van in the middle of the intersection.
The dash was randomly freezing for about 5 minutes and then reset itself while driving. Once it reset itself, it went back to the default settings. It was at heart city Toyota multiple times for this problem. Each time they said that they could not get it to duplicate the problem. After dropping it off in April of 2017, the technician stated that he was able to duplicate the problem of the dash resetting. He did a software update and a hard-reset in order to try fixing it. Low and behold, two days later it happened again. After having it at heart city Toyota to have the problem with the cruise control light flickering, for the fifth time, fixed, I reported about the dash still having the problem of resetting itself. The manager of heart city Toyota told me at that point that I am not welcome back to their dealership. After contacting Toyota corporate about this, I was told that they are able to refuse service even with the warranty still present. They explained that I needed to take it to another Toyota dealership to have it diagnosed. So I contacted jordan Toyota and explained the situation. The service manager there informed me that if heart city Toyota was not able to diagnose the problem, then they were not going to start from scratch to diagnose the problem themselves. Three weeks later, while driving on a county road, the dash began to smoke and I pulled off of the road. When it began to smoke even more, I exited the vehicle and as I was getting as far away as I could I seen flames. I called 9-1-1 right away. By the time the fire department was able to get there and extinguish the fire, the van was destroyed. Which ended up being a total loss. All of which seemed to be due to an electrical fire in the dash. Luckily no one was hurt.
| Electrical System problems | |
| Wiring problems | |
| Software problems |