The B1240 Code has a meaning and this code is related with the engine diagnosis. It is necessary to know the meaning of the code and meaning of the code is not similar to all car engines. That is why, it is necessary to know the model and manufacturer. The car code has dictionary meaning and meaning is B for Body Code Problem is electronic suspension, antilock brake system and steering systems. 1 forMFG – Manufacturer Specific. 2 for Accelerator Pedal Position Sensor 1 show. 4 for BBV Sensor Circuit Low Voltage and 0 for Transmission Engaged at High Throttle Angle.