The general meaning of the car engine code may be used when you do not have the real meaning. The real meaning of the code is found from the car manufacturer. So, you should look for the real meaning of the car engine P3455 Code. If the real meaning of the code is not found, then general meaning or the automobile dictionary meaning can used for solving the car engine. The general meaning of the code is p is Powertrain Code Problem is related engine, transmission and emissions systems. 3 is SAE – Generic. 4 is Transmission. 5 is TP Sensor Learn Not Complete. 5 is Park or Neutral Position Switch Circuit Engine Torque Signal Circuit.