WOMS
P code powertrain Medium severity

P0986 Shift Solenoid E Control Circuit High

The OBD2 code P0986 indicates that there is a high voltage signal detected in the control circuit for Shift Solenoid E, which may suggest a malfunction in the solenoid or its circuit

Definition

The OBD2 code P0986 indicates that there is a high voltage signal detected in the control circuit for Shift Solenoid E, which may suggest a malfunction in the solenoid or its circuit

Common causes

  • Faulty shift solenoid E
  • Wiring issues (shorts or open circuits)
  • Poor electrical connections
  • Faulty transmission control module (TCM)
  • Low transmission fluid levels
  • Contaminated transmission fluid
  • Internal transmission problems

Common misdiagnoses

  • Transmission fluid issues
  • Faulty transmission control module (TCM)
  • Wiring or connector problems
  • Shift solenoid E failure
  • Other shift solenoid malfunctions
  • Transmission valve body issues
  • Engine control module (ECM) problems
  • Incorrectly diagnosed transmission failure

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 Shift Solenoid E. Look for signs of damage, corrosion, or loose connections

  4. 4. Pay special attention to the harness that connects to the transmission, as this is where the solenoid is located

  5. 5. Test the Shift Solenoid E

  6. 6. If accessible, test the solenoid itself for proper operation. You can do this by measuring the resistance across the solenoid terminals with a multimeter. Refer to the vehicle's service manual for the specific resistance values

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

  8. 8. Check the Transmission Fluid

  9. 9. Ensure that the transmission fluid is at the correct level and in good condition. Low or dirty fluid can affect solenoid operation

  10. 10. If the fluid is contaminated, consider performing a transmission fluid change

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

  12. 12. The TCM controls the operation of the shift solenoids. Check for any signs of damage or malfunction in the TCM

  13. 13. If necessary, test the TCM for proper operation and communication with other vehicle systems

  14. 14. Check for Ground Issues

  15. 15. Ensure that the ground connections for the solenoid and TCM are secure and free of corrosion. Poor grounding can lead to high voltage readings

  16. 16. Perform a Voltage Test

  17. 17. With the ignition on (engine off), use a multimeter to check the voltage at the solenoid connector. Compare the readings to the specifications in the service manual

  18. 18. If the voltage is too high, trace the circuit back to find the source of the issue

  19. 19. Inspect the Fuse

  20. 20. Check the fuse related to the transmission control system. A blown fuse can cause circuit issues

  21. 21. Clear Codes and Test Drive

  22. 22. After performing repairs or adjustments, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  23. 23. Consult a Professional

  24. 24. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the P0986 code. Always refer to the specific service manual for your vehicle for detailed procedures and specifications