The automobile meaning of the engine P0236 Code is P for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 2 for BBV Sensor Circuit Low Voltage. 3 for BBV Sensor Circuit Low Voltage and 6 for Transmission. The automobile meaning of the engine P0236 Code has real meaning. The real meaning of the code is found from the car manufacturer and in the car engine manual, you will get all meanings of the code. The car engine problem is a serious problem and it is important to solve the car engine problem before driving the car.