The B1605 Code is connected with the faulty car engine and it is necessary to solve the engine problem. From the body of the car engine, the problem code is triggered. The dictionary meaning of the code is necessary to know. 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. 0 for IC Circuit High Voltage. 5 for Park/Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit. You can solve the problem if you have all necessary machineries.