The B1231 Code is found for the engine error. By the number, it is possible to identify the problem. For solving the problem from engine the technician need to know model number and manufacturer of the code. Because the code may appear in different models or car for different reasons. The technician also need to use manual of the car. So, the technician can identify the problem quick. It is found that the code B1231 is shown due to antilock brake system, electronic suspension and steering systems. Since the device cluster is riding in a plastic dash, a ground circuit through the wiring harness is typically wanted to do the power circuit.