Transmission Not Go Into Gear problems of the 2006 Hyundai Elantra

The contact owns a 2006 Hyundai Elantra. The contact stated that while driving at various speeds, the brake pedal was depressed but the vehicle failed to respond. The contact mentioned that a crash was prevented due to the failure. In addition, the contact stated that while driving at various speeds, the vehicle failed to switch gears. The vehicle was taken to a dealer where it was diagnosed that the spark plugs and the wires needed to be replaced. The vehicle was repaired however, the failure recurred. The manufacturer was not notified of the failure. The failure mileage was 100,000.