The general meaning of the car engine P3453 Code is found online and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 3 for SAE – Generic. 4 for Transmission. 5 for TP Sensor Learn Not Complete and 3 for Transmission Control Module Reprogrammable Memory. It is important thing that to use the right meaning but if the real meaning of the code is not found, then automobile dictionary meaning of the code can be used. Do not drive the car if the car engine is faulty and make sure that the car engine is fully before taking the car for a drive.