Four problems related to software have been reported for the 2011 Toyota Prius. The most recently reported issues are listed below.
A few months ago I had the required software update to adjust the safety feature in the hybrid system in case of a failure. While driving on a side street on 3/1/19 I pressed the gas after being stopped, the car jerked, and the check hybrid system light came on. This was on railroad tracks but the car did drive on the gas engine a short distance to make it over the railroad tracks. I had the car towed to a Toyota dealer who stated the inverter was bad, but that Toyota would replace it as they extended the warranty. This seems to be an issue that Toyota is ignoring. I also own a 2014 Toyota Prius v which is also prone to this issue. Toyota should address this issue beyond a mere software update.
June 29th 2018 was in the car wash going thorugh when the dash board panel said traction battery low put in park the battery indicator showed one bar light on but I couldnt put it in park for I was still going thorgh car wash when it was done washing put car in drive and it was very slow in driving it took it awhile to come back up in power July 6th took it to local dealer and I think they thought I was nuts they said they never heard of such of a thing happing like that. Thought matbe it was the new battery they put in my car in March of 20018 so I want this on record that I had it checked even called and checked on line if there was a trecall only thing I found was a 2014 recall on my year but not my vion of the electrical system software. Is it possable that is what happened to my car. Hope you can give me a answer.
On two separate occasions in December of 2013, with two different drivers, the brakes on our 2011 model year Prius (purchased new in February 2012), failed to engage. The first time occured when I was driving (with one of my teenagers in the car with me), and the second time occured when my wife was drving the car alone. In both instance we pressed the brake pedal, but the brakes failed to respond at all. Although it is winter, the roads were clear, and the car did not slow down at all when the brakes were pressed / applied. Interestingly, after 30 - 60 seconds, the brake function restored itself. Since December the car has been at the shop at the Toyota dealership where we purchased the car. The shop has been unable to identify the source of the problem. Additionally, the shop indicated they contacted Toyota mechanics and service support staff to help identify and fix the problem, but Toyota claimed they never heard of such a problem or anything like it. Moreover, Toyota refuses to make any repairs or change any parts (even though the car is still under warranty). Yet, this past Wednesday (February 12, 2014), Toyota announced a recall on rav4's and other models for a software problem that causes the anti-brakes to intermittently turn off. This is particularly troubling, given Toyota's claim that they never heard of anything like this and did not know what to fix. Further, Toyota announced a recall on the Prius itself, for a software problem that might cause the car to turn off completely while driving. Clearly, Toyota has a problem with its software in a number of vehicles. At this point, all I have received is corporate double talk, and I urge the NHTSA to pursue this matter as vigorously as possible.
The contact owns a 2011 Toyota Prius. While driving 40 mph, the vehicle lost power. The vehicle was able to be restarted. The failure recurred twice. The dealer updated the software. The vehicle was repaired; however, the failure recurred. The vehicle was taken to the dealer a second time where the technician stated that they dif not have the correct code for the software. The vehicle was not repaired. The manufacturer was notified. The approximate failure mileage was 60,000.