The automobile meaning of the engine P0239 Code is found online and it is necessary to know the real meaning of the engine. The automobile meaning of the engine 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 9 for Transmission. The valves of individually cylinder are kept closed using a pair of arms that replace the conservative engine’s roller-type rocker arm. The engine P0239 code is one of these arms what follows the cam profile while the 2 arm links to the valves. During usual engine operation the 2 arms are linked by a locking pin.