The B1671 Code is necessary thing and you cannot solve the problem if you do not get the correct definition. This code is found in different car’s engine but meaning of the code is not same. you have to solve the problem as soon as possible for making the car active. The dictionary meaning of the code helps for solving the problem. 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. 6 for Vehicle Speed Control and Idle Control System. 7 for Vehicle Speed Output Circuit and 1 for TFP Valve Position Switch-Drive Without Drive Ratio.