The automobile meaning of the car engine of the P204E Code is P for Powertrain Code – Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 0 for Transmission. 4 for Control Module Throttle Actuator Position Performance e – TFP Valve Position Switch-Drive Without Drive Ratio. The real meaning of the engine code is found in the car engine manual. Do not follow wrong meaning of the code for solving the car engine problem. However, you may try to fix the car engine if you have expertise and all tools for fixing the car engine.