The B2104 Code is found in the car engine and you need to know the meaning for solving the car engine. The dictionary meaning of the code is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 2 for MFG – Manufacturer Specific. 1 for Transmission. 0 for IC Circuit High Voltage and 4 for Cruise Vehicle Speed/Set Speed Difference Too High. Body of the engine has the main problem and it is easy to solve the problem. Now the engineer needs to know the real meaning of the manufacturer and model number of the car.