The P20A8 Code has general and real information. For solving the car engine problem, the real information of the code is necessary. The manufacturer of the car engine has put a meaning of the code and for solving the car engine, that meaning of the code is important thing. The dictionary meaning of the code is not helpful. You can get general information online. The dictionary meaning of the code is P for Powertrain Code – Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 0 for Transmission. A for BBV Sensor Circuit Low Voltage and 8 for Park/Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit.