Detection Conditions

DTC P0230 indicates excessive current draw is detected (with Fuel Pump (FP) output command ON) on FP circuit or voltage is not detected (FP output command OFF) on FP circuit (PCM expects to detect VPWR voltage coming through fuel pump relay coil to FP circuit).

DTC P0231 indicates PCM did not detect B+ voltage on Fuel Pump Module (FPM) circuit when fuel pump was commanded ON.

DTC P0232 indicates PCM detected FPM circuit voltage was high when fuel pump was commanded OFF.

DTC 1641 indicates a fault with Fuel Pump Driver Module (FPDM). No possible cause is identified.

Fuel Pump Driver Module (FPDM) modulates voltage to fuel pump to achieve proper fuel pressure. Voltage for fuel pump is supplied by power relay or FPDM power supply relay.