The meaning of the engine code is found online and from manufacturer. The P20D5 Code has a meaning and you may use that manufacturer meaning for your car if you want to solve the problem. Do not use automobile dictionary meaning of the code for solving the car engine. The automobile dictionary meaning is a common meaning and that is P for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 0 for Fuel And Air Metering. D for BBV Sensor Circuit Low Voltage and 5 for Park or Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit.