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P code powertrain High severity

P0918 Gear Shift Position Circuit Intermittent

The OBD2 code P0918 indicates an intermittent issue with the gear shift position circuit, which means there may be a problem with the signals sent from the gear shift position sensor to the vehicle's control module

Definition

The OBD2 code P0918 indicates an intermittent issue with the gear shift position circuit, which means there may be a problem with the signals sent from the gear shift position sensor to the vehicle's control module

Common causes

  • Faulty gear shift position sensor
  • Wiring issues (shorts, opens, or corrosion)
  • Poor electrical connections
  • Malfunctioning transmission control module (TCM)
  • Faulty transmission range sensor
  • Mechanical issues in the transmission
  • Software glitches in the vehicle's control modules

Common misdiagnoses

  • Transmission Control Module (TCM) failure
  • Faulty gear shift lever or assembly
  • Wiring issues or shorts in the circuit
  • Faulty transmission position sensor
  • Malfunctioning transmission solenoids
  • Incorrectly calibrated or programmed TCM
  • Low transmission fluid levels or quality
  • Mechanical transmission issues
  • Faulty connectors or terminals
  • Other electrical issues in the vehicle's wiring harness

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues that need to be addressed

  2. 2. Inspect Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors associated with the gear shift position sensor. Look for signs of damage, corrosion, loose connections, or frayed wires

  4. 4. Ensure that all connectors are securely attached and free of dirt or moisture

  5. 5. Test the Gear Shift Position Sensor

  6. 6. Use a multimeter to test the resistance and voltage output of the gear shift position sensor. Compare the readings to the specifications provided in the vehicle’s service manual

  7. 7. If the sensor is faulty, it may need to be replaced

  8. 8. Check for Ground Issues

  9. 9. Ensure that the ground connections for the gear shift position circuit are secure and free of corrosion. A poor ground can cause intermittent issues

  10. 10. Inspect the Transmission Control Module (TCM)

  11. 11. Check the TCM for any signs of damage or corrosion. Ensure that it is properly connected and functioning

  12. 12. If necessary, reprogram or update the TCM software according to the manufacturer’s guidelines

  13. 13. Look for Mechanical Issues

  14. 14. Inspect the gear shift mechanism for any mechanical binding or misalignment that could affect the sensor's operation

  15. 15. Ensure that the gear shift lever moves freely and is properly aligned

  16. 16. Clear Codes and Test Drive

  17. 17. After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner

  18. 18. Take the vehicle for a test drive to see if the code reappears. Monitor the performance of the transmission and gear shifting

  19. 19. Consult Technical Service Bulletins (TSBs)

  20. 20. Check for any TSBs related to the P0918 code for your specific vehicle make and model. Manufacturers may have issued updates or fixes for known issues

  21. 21. Professional Diagnosis

  22. 22. If the problem persists after performing these steps, consider seeking help from a professional mechanic or dealership. They may have specialized diagnostic tools and experience to pinpoint the issue more accurately. By following these troubleshooting steps, you should be able to identify and resolve the underlying cause of the P0918 code