The error B1311 Code is set for the engine of the car and it is necessary code. For solving the problem of the engine, it is necessary to know the meaning of the code. The meaning of the code is related with the model and manufacture. By reading the manual, it is possible to identify the meaning. The problem of the code is related with the body of the engine. 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. 3 for IC Module 4X Ref Circuit Intermittent, No Pulses. 1 for Low Coolant Circuit and 1 for TFP Valve Position Switch-Drive Without Drive Ratio.