The contact owns a 2016 Toyota Corolla. The contact stated while driving at an undisclosed speed, the vehicle downshifted with no warning light illuminated. The contact also stated that the steering wheel seized with no warning light illuminated. The contact stated that the steering wheel became difficult to turn. The vehicle was able to restart. The vehicle was taken to an independent mechanic, where it was diagnosed that the steering module and the transmission had failed and needed to be replaced. The vehicle was not repaired. The vehicle was taken to the dealer but was not diagnosed or repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 43,000.