The engine P0173 Code tells about the car engine problem and it is necessary to know the code meaning for solving the car engine problem. Do not use any meaning of the code for fixing the car engine problem. The general meaning of the code is available online and it is also known as automobile dictionary meaning. The automobile meaning of the code is P for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 1 for Transmission. 7 for Vehicle Speed Output Circuit and 3 for Transmission Control Module Reprogrammable Memory. A test drive is recommended after fixing the car engine.