The error B1304 Code is set for the engine and if you want to solve the problem of the engine, you should understand the meaning of the code. As model and manufacturer can change the meaning of the code, so it is necessary to know the model and manufacture to get the meaning of the code. This code has dictionary meaning what is necessary to know for the better result. The meaning of the code B1304 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. 0 for IC Circuit High Voltage and 4 for Cruise Vehicle Speed and Set Speed Difference Too High.