You will get various meanings of the car engine P0456 Code and you should use the right meaning only. The automobile dictionary meaning of the engine code is not right meaning and you will get some general information from it. 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. 5 for Cylinder 10 Contribution/balance Fault Cylinder and 6 for Exhaust Gas Recirculation Sensor B Circuit High. Check the car engine and learn about the problem and take step for solving the car engine. Finally, test drive is recommended.