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P0968 Pressure Control Solenoid "C" Control Circuit/Open

The OBD2 code P0968 indicates a problem with the pressure control solenoid "C" in the transmission, specifically that there is an open circuit or a control circuit issue affecting its operation

Definition

The OBD2 code P0968 indicates a problem with the pressure control solenoid "C" in the transmission, specifically that there is an open circuit or a control circuit issue affecting its operation

Common causes

  • Faulty pressure control solenoid "C"
  • Open or shorted wiring in the control circuit
  • Poor electrical connections
  • Failed transmission control module (TCM)
  • Low transmission fluid level
  • Contaminated transmission fluid
  • Faulty transmission valve body

Common misdiagnoses

  • Transmission fluid issues
  • Faulty transmission control module (TCM)
  • Wiring or connector problems
  • Faulty pressure control solenoid
  • Transmission valve body issues
  • Low transmission fluid level
  • Faulty engine control module (ECM)
  • Incorrectly installed or damaged transmission components

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 issue

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the Pressure Control Solenoid "C". Look for

  3. 3. Damaged, frayed, or corroded wires

  4. 4. Loose or disconnected connectors

  5. 5. Signs of moisture or dirt that could affect connections

  6. 6. Test the Pressure Control Solenoid

    If accessible, test the solenoid itself for proper operation. This may involve

  7. 7. Checking the resistance of the solenoid with a multimeter (refer to the vehicle's service manual for specifications)

  8. 8. Applying voltage to the solenoid to see if it activates

  9. 9. Check Power and Ground

    Use a multimeter to check for proper voltage and ground at the solenoid connector

  10. 10. With the ignition on (engine off), check for the specified voltage at the solenoid connector

  11. 11. Ensure that the ground circuit is intact and has a good connection

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

    The TCM controls the solenoid. Check for

  13. 13. Proper operation of the TCM

  14. 14. Any signs of damage or corrosion on the TCM connectors

  15. 15. Software updates or reprogramming that may be needed

  16. 16. Check for Short Circuits

    Inspect the wiring for any short circuits to ground or power that could cause the solenoid to malfunction

  17. 17. Test the Transmission Fluid

    Low or contaminated transmission fluid can affect solenoid operation. Check the fluid level and condition, and replace it if necessary

  18. 18. Perform a System Reset

    After addressing any issues found, clear the trouble codes and perform a test drive to see if the code returns

  19. 19. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P0968 code for your specific vehicle make and model, as there may be known issues or fixes

  20. 20. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician for further diagnosis.Conclusion By following these troubleshooting steps, you can systematically identify and resolve the issue related to the P0968 code. Always refer to the vehicle's service manual for specific procedures and specifications related to your vehicle