The contact owns a 2019 Nissan Titan. The contact stated that while driving 55 MPH, the DEF System Error – See Dealer’ message was displayed with a countdown for reduced power. The vehicle was taken to a dealer and the contact was informed that the fuel system error in the fuel pump system needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 61,888.