Diesel Fuel System Pre-heater problems of the 2012 Ford F-250

The contact owns a 2012 Ford F-250. The contact stated that while driving at various speeds over 50 mph, the vehicle shifted into limp mode. No warning lights were illuminated. The vehicle was taken to a local dealer, where the failures could not be duplicated. The vehicle was not repaired. The contact stated that the failure persisted, and that the transmission was slipping while shifting. The contact also stated that prior to entering the vehicle, he noticed a fluid leak underneath. The vehicle was taken back to the dealer, where unknown transmission repairs were completed; however, the failure recurred. The vehicle was then taken to an independent mechanic, where the fuel pressure regulator and heater malfunction failure codes were retrieved, and it was diagnosed that the diesel exhaust fluid (def) tank needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 160,100.