WOMS
B code body High severity

B1228 Fuel Temperature Sensor #2 Circuit Short to Battery

The OBD2 code B1228 indicates a short circuit in the fuel temperature sensor #2 circuit, causing it to receive an incorrect voltage, typically from the battery

Definition

The OBD2 code B1228 indicates a short circuit in the fuel temperature sensor #2 circuit, causing it to receive an incorrect voltage, typically from the battery

Common causes

  • Shorted wiring or connectors
  • Faulty fuel temperature sensor #2
  • Corroded or damaged connectors
  • Poor ground connection
  • Malfunctioning engine control module (ECM)

Common misdiagnoses

  • Faulty fuel temperature sensor
  • Wiring issues or shorts in the harness
  • Faulty engine control module (ECM)
  • Corroded connectors
  • Issues with the fuel pump
  • Problems with the fuel gauge or sender unit
  • Incorrectly installed or damaged fuel lines

Troubleshooting steps

  1. 1. Understand the Code

    B1228 typically refers to a fault in the fuel temperature sensor circuit, specifically indicating that the circuit is shorted to battery voltage

  2. 2. Gather Information

    Vehicle Specifications: Check the vehicle's service manual for specific information about the fuel temperature sensor and its circuit

  3. 3. Sensor Location

    Identify where Fuel Temperature Sensor #2 is located in your vehicle

  4. 4. Visual Inspection

    Wiring and Connectors: Inspect the wiring harness and connectors associated with the fuel temperature sensor for any signs of damage, corrosion, or loose connections

  5. 5. Shorts

    Look for any exposed wires that may be touching the chassis or other components, which could cause a short to battery

  6. 6. Check the Sensor

    Resistance Testing: Use a multimeter to measure the resistance of the fuel temperature sensor. Compare the readings to the specifications in the service manual

  7. 7. Connector Condition

    Ensure that the sensor connector is clean and free of corrosion

  8. 8. Check the Circuit

    Voltage Testing: With the ignition on (engine off), use a multimeter to check the voltage at the sensor connector. It should match the expected voltage (usually around battery voltage)

  9. 9. Ground Testing

    Check the ground connection for the sensor to ensure it is solid and not corroded

  10. 10. Inspect Related Components

    ECM/PCM: Check the Engine Control Module (ECM) or Powertrain Control Module (PCM) for any faults or issues that could affect the sensor readings

  11. 11. Other Sensors

    Inspect other related sensors and circuits that may be affecting the fuel temperature sensor

  12. 12. Clear the Code

    After performing the checks and repairs, clear the OBD-II codes using a scan tool and take the vehicle for a test drive to see if the code returns

  13. 13. Further Diagnosis

    If the code persists, consider using an oscilloscope to monitor the signal from the sensor while the vehicle is running. This can help identify intermittent issues

  14. 14. If necessary, consult with a professional technician or refer to the manufacturer’s service manual for more advanced diagnostic procedures

  15. 15. Replace Components if Necessary

    If the sensor is found to be faulty, replace it. If wiring issues are found, repair or replace the damaged wiring or connectors

  16. 16. Final Check

    After repairs, ensure that all connections are secure and that there are no additional codes present. By following these steps, you should be able to diagnose and address the issue related to the B1228 code effectively. If you're not comfortable performing these steps, it's advisable to seek assistance from a qualified mechanic