The P20BA Code has an appropriate meaning and if the real explanation of the code is not found, it cannot be solved from the car engine. You have to read the manual of the car and there you will get all necessary information for solving the car engine. 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. B for BBV Sensor Circuit Low Voltage and A for TFP Valve Position Switch-Drive Without Drive Ratio. However, do not try to solve the problem if you do not have all information.