WOMS
P code powertrain High severity

P0626 Fuel Pump ""A"" Control Circuit High

The OBD2 code P0626 indicates a problem with the fuel pump "A" control circuit, specifically that the circuit is reading a high voltage or signal when it should not be

Definition

The OBD2 code P0626 indicates a problem with the fuel pump "A" control circuit, specifically that the circuit is reading a high voltage or signal when it should not be

Common causes

  • Faulty fuel pump
  • Damaged wiring or connectors
  • Short circuit in the fuel pump control circuit
  • Faulty fuel pump relay
  • Malfunctioning engine control module (ECM)
  • Poor ground connection
  • Corroded connectors or terminals

Common misdiagnoses

  • Faulty fuel pump
  • Bad fuel pump relay
  • Wiring issues or shorts in the fuel pump circuit
  • Faulty engine control module (ECM)
  • Bad fuel pressure regulator
  • Clogged fuel filter
  • Incorrectly installed or damaged fuel pump connector
  • Battery or charging system issues

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide additional context for the issue

  2. 2. Inspect the Fuel Pump Relay

    Locate the fuel pump relay in the fuse box and inspect it for any signs of damage or corrosion. If necessary, swap it with a similar relay to see if the problem persists

  3. 3. Examine the Wiring and Connectors

    Inspect the wiring and connectors leading to the fuel pump for any signs of damage, corrosion, or loose connections. Pay special attention to the ground connections

  4. 4. Test the Fuel Pump

    Use a multimeter to check the voltage at the fuel pump connector. Ensure that the voltage is within the manufacturer's specifications when the ignition is turned on

  5. 5. If the voltage is too high or too low, further investigate the wiring and control circuit

  6. 6. Check the Fuel Pump Control Module

    If your vehicle has a fuel pump control module, inspect it for faults. This module controls the operation of the fuel pump and can cause issues if it is malfunctioning

  7. 7. Inspect the PCM (Powertrain Control Module)

    The PCM controls the fuel pump operation. Check for any software updates or known issues with the PCM. If necessary, perform a reset or reprogramming

  8. 8. Test the Fuel Pump Ground

    Ensure that the fuel pump has a good ground connection. A poor ground can cause high voltage readings

  9. 9. Check for Short Circuits

    Inspect the wiring for any short circuits that could be causing the high voltage reading. This may involve checking for damaged insulation or pinched wires

  10. 10. Perform a Voltage Drop Test

    Conduct a voltage drop test on the fuel pump circuit to ensure that there is no excessive resistance in the wiring

  11. 11. Consult the Service Manual

    Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the fuel pump control circuit.1

  12. 12. Clear the Codes and Test Drive

    After performing repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns.1

  13. 13. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P0626 code