One problem related to wiring has been reported for the 2015 Toyota Prius. The most recently reported issues are listed below.
Toyota soy wiring class action lawsuit! the wire harness contain soy wiring materials that are very attractive to rodents, resulting in costly repairs. Parked my car at work (on January 18 2017) in a full parking lot at a dealership with dozens of other cars but only my car had the wire harness chewed by rodents, and of dozens of cars around my car, the rodents chose my car, the 2015 Prius because the wiring in the engine bay are made of soy which attracts rodents. . Read more...