The automobile meaning of the engine P229D Code is found online and it is not used for solving the car engine problem. Due to use of the automobile meaning of the code, your problem from the car engine may not solve. You may get new problems in the car engine. The automobile meaning of the engine P229D 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 D for Transmission. The powertrain problem is easy to solve at cheap rate without changing component.