WOMS
B code body Medium severity

B1307 Oil Level Switch Circuit Short To Battery

The OBD2 code B1307 indicates a malfunction in the oil level switch circuit, specifically that there is a short circuit to the battery, which may cause incorrect readings or failure of the oil level sensor

Definition

The OBD2 code B1307 indicates a malfunction in the oil level switch circuit, specifically that there is a short circuit to the battery, which may cause incorrect readings or failure of the oil level sensor

Common causes

  • Shorted wiring or connectors
  • Faulty oil level switch
  • Corroded or damaged connectors
  • Grounding issues
  • Faulty engine control module (ECM) or body control module (BCM)

Common misdiagnoses

  • Faulty oil level switch
  • Wiring issues or shorts in the harness
  • Faulty engine control module (ECM)
  • Corroded connectors
  • Incorrect oil level readings due to oil contamination
  • Malfunctioning oil pressure sensor
  • Issues with the vehicle's body control module (BCM)

Troubleshooting steps

  1. 1. Understand the Code

    B1307 typically refers to a problem with the oil level switch circuit, indicating that the circuit is shorted to battery voltage. This could mean that the switch is stuck in the "on" position or there is a wiring issue

  2. 2. Visual Inspection

    Wiring and Connectors: Inspect the wiring harness and connectors related to the oil level switch. Look for frayed wires, corrosion, or loose connections

  3. 3. Oil Level Switch

    Check the oil level switch itself for any signs of damage or wear

  4. 4. Check the Oil Level

    Ensure that the oil level is within the manufacturer's specified range. An incorrect oil level can sometimes trigger false codes

  5. 5. Test the Oil Level Switch

    Continuity Test: Disconnect the oil level switch connector and use a multimeter to check for continuity. The switch should show continuity when submerged in oil and no continuity when out of oil

  6. 6. Resistance Test

    Measure the resistance of the switch. Compare the readings to the specifications in the vehicle’s service manual

  7. 7. Inspect the Circuit

    Voltage Test: With the ignition on (engine off), check for voltage at the oil level switch connector. If you see battery voltage where it shouldn’t be, there may be a short in the wiring

  8. 8. Ground Test

    Ensure that the ground connection for the oil level switch is intact and functioning properly

  9. 9. Check for Shorts

    Use a multimeter to check for shorts in the wiring harness. Look for any points where the wire may be pinched or damaged, causing it to short to the battery

  10. 10. Scan for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes that may provide additional context or indicate other issues

  11. 11. Clear the Code

    After performing the above checks and repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

  12. 12. Consult the Service Manual

    If the issue persists, refer to the vehicle’s service manual for specific diagnostic procedures related to the oil level switch circuit

  13. 13. Seek Professional Help

    If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these steps, you should be able to identify and address the cause of the B1307 code effectively