The P20DA Code means P for Powertrain Code – Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 0 for Transmission. D means BBV Sensor Circuit Low Voltage and A for TFP Valve Position Switch-Drive Without Drive Ratio. For solving the car engine problem, no part or component should be replaced or changed with reference to only a P20DA DTC. The car service manual should be checked for more information on possible reasons of the fault, along with required testing. The P20da engine code seems a kind of powertrain problem and it is easy to solve without less problem.