The P20B0 Code meaning is available online but it is not necessary to follow that dictionary meaning. You will not get benefit from the dictionary meaning for solving the car engine problem. You need to get the manufacturer information. Manufacture set the meaning of the code. You will get this code in different car engines but meanings are different for each car engine. The general meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 0 for Fuel And Air Metering. B for BBV Sensor Circuit Low Voltage and 0 for Transmission Engaged At High Throttle Angle.