The automobile dictionary meaning of the engine P0803 Code is found online and it is not very valuable thing for solving the car engine. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 8 for Ignition System Or Misfire. 0 for IC Circuit High Voltage and 3 for Transmission Control Module Reprogrammable Memory. If you use this meaning for solving the car engine, you need to be careful. You must trust on the real meaning of the code and do not try to solve the car engine problem, if you are not able to fix the car engine.