The dictionary meaning of the P013B Code is necessary to know and the dictionary meaning is available online. The general/dictionary meaning of the code is P for Powertrain Code – Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 1 for Fuel and Air Metering. 3 for Low Coolant Circuit. B for TFP Valve Position Switch-Drive Without Drive Ratio. You need to fix the car engine problem and that is why, you should take the car to the automobile engineer for solving the car engine problem. Do not drive the car with the engine what can be a reason of terrible accident.