P0231 OBD II Trouble Code Fuel Pump Secondary (Feedback) Circuit Low Voltage

Detailed information on troubleshooting and repairing a P0231 DTC code which has to do with low voltage on the fuel pump secondary circuit. Also includes links to relevant forum topics on the code.

Symptoms of P0231 OBD II Trouble Code

  • No start Start and stall
  • Misfire
  • Inadequate fuel supply

Common Causes of P0231 OBD II Trouble Code

  • Bad FP (fuel pump) relay
  • Harness chafing causing open in fuel pump supply circuit
  • Loose/damaged connectors
  • Open in feedback circuit
  • Fuel pump fuse blown due to short to ground