You need to test the car engine and make sure that you have used correct meaning of the engine P0500 Code 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. 5 for Computer And Auxiliary Outputs. 0 for IC Circuit High Voltage and 0 for Transmission Engaged At High Throttle Angle. The valves are kept shut using a pair of arms that substitute the conventional engine’s roller-type rocker arm. The engine P0500 code is one of these arms trails the cam profile while the 2nd arm joins to the valves.