P1645 P1645 OBD Code Definition: P1645 EVAP Solenoid Output Circuit P1645 OBD Code Description: OBD Code P1645 EVAP Solenoid Output Circuit OBD Code P1645 Booster Voltage – Operate Injector OBD Code P1645 Fuel pump resistor switch circuit malfunction OBD Code P1645 Body ECU Malfunction OBD Code P1645 Body ECU Malfunction