The contact owns a 2019 Nissan Sentra. The contact stated while driving at an undisclosed speed, the transmission downshifted, and the vehicle stalled. The message to see “Owner’s Manual” was displayed. The vehicle was able to restart. The vehicle was taken to an independent mechanic, where it was diagnosed that the transmission had failed and needed to be replaced. The vehicle was not repaired. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 134,145.