The automobile dictionary meaning of the car engine P1863 Code lets you know about the car engine problem. Always look for the right meaning of the code and the powertrain problem of the car engine should be fixed properly without changing any part of the car engine. Automobile dictionary meaning of the code can be used for solving the car engine and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 8 for Ignition System Or Misfire. 6 for Control Module Throttle Actuator Position Performance and 3 for Transmission Control Module Reprogrammable Memory.