The engine P0315 Code lets you know about the problem of the engine and location of the problem. If the engineer knows the meaning of the code, then it is easy to fix the car engine. Do not allow any general meaning of the code. For solving the car engine, real meaning of the code is important thing. The automobile meaning of the code is P for OBD-II Diagnostic Powertrain (P) Trouble Code For Engine. 0 for Intake Valve Control Solenoid Circuit Low. 3 for Engine Oil Temperature Sensor Malfunction. 1 for Cylinder 10 Contribution/balance Fault and 5 for Exhaust Gas Recirculation Sensor B Circuit High.