The automobile dictionary meaning of the engine P0408 Code is found easily. You can easily know the meaning of the engine code from the online and the you can easily know the right meaning from the automobile engine manual of the code. The general meaning of the code is P for OBD-II Diagnostic Powertrain (P) Trouble Code For Engine. 0 for Intake Valve Control Solenoid Circuit Low. 4 for Engine Oil Temperature Sensor Malfunction. 0 for Crankshaft Position Sensor A Circuit Malfunction and 8 for Exhaust Gas Recirculation Sensor B Circuit High. Do not use the automobile dictionary meaning for solving the car engine.