You need solve the car engine problem as soon as possible and you need to test the car engine if you want to know where the problem is. When the car engine is tested and checked, the engine P1313 Code has come. The engine code is related with the car engine and you can know the meaning of the code from the car engine manual. You can know the automobile dictionary meaning of the code and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 3 for IC Module 4X Ref Circuit Intermittent, No Pulses. 1 for Low Coolant Circuit and 3 for Transmission Control Module Reprogrammable Memory.