WOMS
P code powertrain Medium severity

P0928 Gear Shift Lock Solenoid Circuit / Open

The OBD2 code P0928 indicates a malfunction in the gear shift lock solenoid circuit, specifically that there is an open circuit, which means the electrical connection is incomplete or broken, preventing the solenoid...

Definition

The OBD2 code P0928 indicates a malfunction in the gear shift lock solenoid circuit, specifically that there is an open circuit, which means the electrical connection is incomplete or broken, preventing the solenoid from functioning properly

Common causes

  • Faulty gear shift lock solenoid
  • Open or shorted wiring in the circuit
  • Poor electrical connections
  • Malfunctioning transmission control module (TCM)
  • Blown fuse related to the solenoid circuit
  • Faulty brake switch
  • Corroded connectors or terminals

Common misdiagnoses

  • Faulty gear shift lever
  • Malfunctioning transmission control module (TCM)
  • Defective brake light switch
  • Wiring issues or shorts in the circuit
  • Faulty ignition switch
  • Transmission fluid issues
  • Problems with the battery or charging system
  • Incorrectly installed or damaged gear shift assembly

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 more context and help identify related issues

  2. 2. Inspect Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors associated with the gear shift lock solenoid. Look for signs of damage, corrosion, or loose connections

  4. 4. Pay special attention to the wiring harness for any fraying or breaks

  5. 5. Test the Gear Shift Lock Solenoid

  6. 6. If accessible, test the solenoid itself for continuity using a multimeter. The solenoid should have a specific resistance value (check the vehicle’s service manual for specifications)

  7. 7. If the solenoid is open (infinite resistance), it may need to be replaced

  8. 8. Check Power and Ground

  9. 9. Use a multimeter to check if the solenoid is receiving the proper voltage when the ignition is on

  10. 10. Ensure that the ground connection for the solenoid is intact and functioning

  11. 11. Inspect the Gear Shift Assembly

  12. 12. Check the gear shift assembly for any mechanical issues that may prevent the solenoid from functioning properly

  13. 13. Ensure that the gear shift lever is not stuck or obstructed

  14. 14. Examine the Transmission Control Module (TCM)

  15. 15. The TCM controls the solenoid operation. If there are issues with the TCM, it may not send the correct signals to the solenoid

  16. 16. Check for any software updates or reprogramming that may be needed

  17. 17. Look for Short Circuits

  18. 18. Inspect the circuit for any short circuits that could cause the solenoid to malfunction. This includes checking for shorts to ground or power

  19. 19. Clear Codes and Test Drive

  20. 20. After performing 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

  21. 21. Consult a Professional

  22. 22. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you can systematically identify and address the cause of the P0928 code. Always refer to the vehicle's service manual for specific procedures and specifications related to your vehicle