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P0980 Shift Solenoid C Control Circuit High

The OBD2 code P0980 indicates a problem with the shift solenoid C control circuit, specifically that the circuit is reading a high voltage or an open circuit when it should not be

Definition

The OBD2 code P0980 indicates a problem with the shift solenoid C control circuit, specifically that the circuit is reading a high voltage or an open circuit when it should not be

Common causes

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

Common misdiagnoses

  • Faulty transmission control module (TCM)
  • Wiring issues or shorts in the harness
  • Faulty shift solenoid C
  • Low transmission fluid level or quality
  • Faulty transmission fluid temperature sensor
  • Incorrectly diagnosed transmission failure
  • Issues with other shift solenoids
  • Problems with the vehicle's computer or software
  • Faulty connectors or terminals
  • Misinterpretation of related codes or symptoms

Troubleshooting steps

  1. 1. Check the Vehicle's Service Manual

    Refer to the specific service manual for your vehicle to understand the wiring diagrams and specifications for the shift solenoid circuit

  2. 2. Visual Inspection

  3. 3. Inspect the wiring and connectors associated with Shift Solenoid C for any signs of damage, corrosion, or loose connections

  4. 4. Look for any frayed wires or broken connectors that could cause an open circuit

  5. 5. Check the Shift Solenoid

  6. 6. Test the shift solenoid itself for proper operation. You can do this by measuring the resistance across the solenoid terminals with a multimeter. Compare the readings to the specifications in the service manual

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

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

  9. 9. Check for any fault codes in the TCM using a scan tool. If there are additional codes, they may provide more context for the issue

  10. 10. Ensure that the TCM is functioning properly and that it is receiving the correct input signals

  11. 11. Check the Power and Ground

  12. 12. Use a multimeter to check for proper voltage at the solenoid connector. You should see battery voltage when the solenoid is commanded on

  13. 13. Verify that the ground circuit for the solenoid is intact and has a good connection

  14. 14. Test the Circuit

  15. 15. Perform a continuity test on the wiring between the TCM and the solenoid to ensure there are no breaks in the circuit

  16. 16. If the circuit is open, trace the wiring to find the fault

  17. 17. Inspect the Transmission Fluid

  18. 18. Check the transmission fluid level and condition. Low or contaminated fluid can affect solenoid operation

  19. 19. If the fluid is dirty or burnt, consider performing a transmission fluid change

  20. 20. Clear the Codes

  21. 21. After performing any repairs or replacements, clear the trouble codes using a scan tool and take the vehicle for a test drive to see if the code returns

  22. 22. Professional Diagnosis

  23. 23. If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with transmission systems and can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the P0980 code