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P0867 Transmission Fluid Pressure

The OBD2 code P0867 indicates a problem with the transmission fluid pressure, specifically that the transmission control module has detected low fluid pressure in the transmission system

Definition

The OBD2 code P0867 indicates a problem with the transmission fluid pressure, specifically that the transmission control module has detected low fluid pressure in the transmission system

Common causes

  • Low transmission fluid level
  • Faulty transmission fluid pressure sensor
  • Faulty transmission control module (TCM)
  • Wiring issues or damaged connectors
  • Clogged transmission filter
  • Internal transmission problems
  • Faulty pump or pump failure
  • Fluid contamination

Common misdiagnoses

  • Faulty transmission control module (TCM)
  • Low transmission fluid level
  • Transmission fluid contamination
  • Faulty transmission pressure sensor
  • Wiring issues or short circuits
  • Faulty torque converter
  • Internal transmission failure
  • Engine control module (ECM) issues
  • Incorrect transmission fluid type
  • Faulty pump or pump pressure issues

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect Transmission Fluid

  3. 3. Check the transmission fluid level. Low fluid levels can cause pressure issues

  4. 4. Inspect the fluid condition. If the fluid is dirty, burnt, or has a burnt smell, it may need to be changed

  5. 5. Examine Wiring and Connectors

  6. 6. Inspect the wiring and connectors related to the transmission fluid pressure sensor. Look for signs of damage, corrosion, or loose connections

  7. 7. Ensure that the connectors are securely attached

  8. 8. Test the Transmission Fluid Pressure Sensor

  9. 9. Use a multimeter to test the resistance of the transmission fluid pressure sensor. Compare the readings to the specifications in the vehicle’s service manual

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

  11. 11. Check for Leaks

    Inspect the transmission for any signs of fluid leaks, which could lead to low fluid levels and pressure issues

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

  13. 13. Check for any issues with the TCM, as it controls the transmission and can affect fluid pressure readings

  14. 14. Ensure that the TCM is receiving proper power and ground

  15. 15. Perform a Transmission Fluid Change

    If the fluid is old or contaminated, changing the transmission fluid and filter may resolve the issue

  16. 16. Check for Mechanical Issues

  17. 17. Inspect the transmission for any internal mechanical problems, such as worn components or clogs in the fluid passages

  18. 18. If necessary, consult a professional for a more in-depth inspection

  19. 19. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  20. 20. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or transmission specialist for further diagnosis. Always refer to the specific service manual for your vehicle for detailed procedures and specifications