The error meaning of the engine P229B Code is helping thing for the car engineer but if the real meaning of the code is not used, then the situation may become worse. The automobile dictionary meaning of the code is not used for solving the car engine problem. The automobile meaning of the code is P for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 2 for BBV Sensor Circuit Low Voltage. 9 for BBV Sensor Circuit Low Voltage and B for Transmission. The powertrain problem is not difficult to solve.