The engine P1501 Code is important thing and you need to fix the car engine. That is why, you must rely on an automobile engineer for solving the car engine. The car engine code is found for the location of the car engine’s problem. It is necessary to know the problem if real meaning of the code is found. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 2 for Accelerator Pedal Position (APP) Sensor 1 Performance. 3 for Cruise Control Servo Indicates Low and 0 for Transmission Engaged At High Throttle Angle.