The dictionary meaning of the P20E3 Code is not very helpful and you may know the meaning of the code. The meaning of the code P20E3 is P for Powertrain Code – Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 0 for Transmission e – BBV Sensor Circuit Low Voltage. 3 for TFP Valve Position Switch-Drive Without Drive Ratio. The engine code P20E3 OBD2 precisely denotes to the camshaft (cam) timing. So, if the cam timing is very slow, the engine light will be illumined and the code will be set. Fix the car engine if you want to enjoy free saving.