The faulty B1602 Code is related with the car engine. The dictionary meaning helps for solving the problem of the engine and the dictionary meaning 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 and 2 for A/C System High Pressure High Temperature. The engine system, in conjunction with the engine control module powertrain control module, starts the B1602 code solenoid valve to regulate oil compression to the engine mechanism that is connected in the valve system to switch valve timing between High and low. If the engine solenoid valve has an open circuit a DTC is stored.