WOMS
P code powertrain Medium severity

P2068 Fuel Level Sensor "B" Circuit High

The OBD2 code P2068 indicates that the fuel level sensor "B" circuit is reporting a high voltage signal, which may suggest a malfunction in the sensor or its wiring

Definition

The OBD2 code P2068 indicates that the fuel level sensor "B" circuit is reporting a high voltage signal, which may suggest a malfunction in the sensor or its wiring

Common causes

  • Faulty fuel level sensor "B"
  • Damaged wiring or connectors in the fuel level sensor circuit
  • Short circuit in the fuel level sensor circuit
  • Open circuit in the fuel level sensor circuit
  • Corroded connectors
  • Faulty engine control module (ECM)
  • Poor ground connection
  • Fuel tank issues (e.g., deformation or damage)

Common misdiagnoses

  • Faulty fuel level sensor
  • Wiring issues or shorts in the circuit
  • Fuel gauge cluster malfunction
  • ECM/PCM issues
  • Fuel tank issues (e.g., leaks or damage)
  • Grounding problems
  • Incorrectly calibrated fuel level sensor
  • Fuel pump problems

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 problem

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the fuel level sensor "B." Look for signs of damage, corrosion, or loose connections

  3. 3. Pay special attention to the wiring harness that connects to the fuel tank and the sensor

  4. 4. Test the Fuel Level Sensor

    If accessible, test the fuel level sensor "B" using a multimeter. Check the resistance of the sensor and compare it to the manufacturer's specifications

  5. 5. If the sensor is out of specification, it may need to be replaced

  6. 6. Check for Ground Issues

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

  7. 7. Use a multimeter to check the ground circuit for continuity and proper voltage

  8. 8. Inspect the Fuel Tank

    If possible, inspect the fuel tank for any signs of damage or contamination that could affect the sensor's operation

  9. 9. Ensure that the fuel level sensor is properly mounted and not obstructed

  10. 10. Test the Fuel Gauge

    If the vehicle has a separate fuel gauge, test it to ensure it is functioning correctly. A faulty gauge can sometimes cause erroneous readings

  11. 11. Check for Short Circuits

    Use a multimeter to check for short circuits in the wiring harness. A short to power can cause the circuit to read high voltage

  12. 12. Clear the Codes and Test Drive

    After performing any repairs or adjustments, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  13. 13. Seek Professional Help

    If the issue persists after performing the above steps, consider seeking help from a qualified mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P2068 code