The dictionary meaning of the code describes the information of the car engine. This B1978 Code comes when the engine code fails to check the area of the code and it specify the code. So, it is easy to get the meaning of the code. The dictionary meaning of the code is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 1 for MFG – Manufacturer Specific. 9 for Fuel and Air Metering. 7 for Vehicle Speed Output Circuit and 8 for PCM Stack Overrun. It is not everything for solving the problem of the car engine.