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P0722Output Speed Sensor Circuit No Signal

The OBD2 code P0722 indicates that the vehicle's output speed sensor is not sending a signal to the engine control module, which can affect transmission performance and shifting

Definition

The OBD2 code P0722 indicates that the vehicle's output speed sensor is not sending a signal to the engine control module, which can affect transmission performance and shifting

Common causes

  • Faulty output speed sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Failed transmission control module (TCM)
  • Faulty transmission
  • Low transmission fluid level
  • Internal transmission issues

Common misdiagnoses

  • Faulty Output Speed Sensor
  • Transmission Control Module (TCM) issues
  • Wiring or connector problems
  • Faulty Input Speed Sensor
  • Transmission fluid issues
  • Internal transmission failure
  • Engine control module (ECM) problems
  • Incorrectly installed or damaged transmission components

Troubleshooting steps

  1. 1.Check for Additional Codes

    Before proceeding, check for any other related trouble codes that may provide more context to the issue

  2. 2.Inspect the Output Speed Sensor

  3. 3.Locate the output speed sensor, which is typically found on the transmission

  4. 4.Inspect the sensor for physical damage, corrosion, or dirt that may affect its operation

  5. 5.Check Wiring and Connectors

  6. 6.Examine the wiring harness and connectors leading to the output speed sensor for any signs of damage, fraying, or corrosion

  7. 7.Ensure that the connectors are securely attached and free of moisture or debris

  8. 8.Test the Output Speed Sensor

  9. 9.Use a multimeter to test the resistance of the output speed sensor. Compare the readings to the specifications provided in the vehicle's service manual

  10. 10.If the sensor is a Hall effect or magnetic type, check for proper voltage and signal output while the vehicle is in motion

  11. 11.Inspect the Transmission

  12. 12.Check for any issues within the transmission that could affect the output speed sensor's operation, such as low fluid levels or internal damage

  13. 13.Check the Vehicle Speed Sensor (VSS)

  14. 14.If the vehicle has a separate VSS, ensure it is functioning correctly, as it may also affect the output speed sensor's performance

  15. 15.Examine the ECM

  16. 16.In rare cases, the issue may lie with the ECM itself. Check for any software updates or known issues with the ECM that could affect sensor readings

  17. 17.Clear Codes and Test Drive

  18. 18.After performing the above checks and repairs, clear the trouble codes using an OBD-II scanner

  19. 19.Take the vehicle for a test drive to see if the code reappears

  20. 20.Consult a Professional

    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 troubleshooting steps, you should be able to identify and resolve the issue related to the P0722 code