WOMS
P code powertrain Medium severity

P1702 TRS Circuit Intermittent Malfunction

The OBD2 code P1702 indicates an intermittent malfunction in the Transmission Range Sensor (TRS) circuit, which affects the transmission's ability to determine the correct gear position

Definition

The OBD2 code P1702 indicates an intermittent malfunction in the Transmission Range Sensor (TRS) circuit, which affects the transmission's ability to determine the correct gear position

Common causes

  • Faulty Transmission Range Sensor (TRS)
  • Poor electrical connections or wiring issues
  • Corroded or damaged connectors
  • Faulty Engine Control Module (ECM)
  • Low transmission fluid levels
  • Internal transmission problems
  • Intermittent short circuits or open circuits in the TRS circuit

Common misdiagnoses

  • Transmission Control Module (TCM) failure
  • Faulty transmission fluid level or condition
  • Shift solenoid issues
  • Wiring or connector problems
  • Faulty neutral safety switch
  • Incorrectly adjusted transmission linkage
  • Engine control module (ECM) issues
  • Battery or charging system problems
  • Faulty sensors (e.g., speed sensors)
  • Mechanical transmission 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. Addressing any related codes can help narrow down the issue

  2. 2. Inspect Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors associated with the transmission range sensor. Look for signs of damage, corrosion, loose connections, or frayed wires

  4. 4. Ensure that all connectors are securely attached and free of dirt or moisture

  5. 5. Test the Transmission Range Sensor

  6. 6. Use a multimeter to test the resistance and voltage output of the transmission range sensor. Compare the readings to the specifications provided in the vehicle's service manual

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

  8. 8. Check for Mechanical Issues

  9. 9. Inspect the transmission linkage to ensure it is properly adjusted and not binding. A misaligned linkage can cause incorrect readings from the range sensor

  10. 10. Ensure that the transmission is shifting properly and that there are no internal transmission issues

  11. 11. Inspect the ECM

  12. 12. Check for any signs of damage or corrosion on the ECM connectors. Ensure that the ECM is functioning correctly and that it is receiving the proper signals from the transmission range sensor

  13. 13. Clear the Codes and Test Drive

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

  15. 15. Take the vehicle for a test drive to see if the P1702 code reappears. Monitor the transmission operation during the drive

  16. 16. Consult Technical Service Bulletins (TSBs)

  17. 17. Check for any TSBs related to the P1702 code for your specific vehicle make and model. Manufacturers may have issued guidance or fixes for known issues

  18. 18. Seek Professional Help

  19. 19. 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 issues and OBD-II diagnostics. By following these troubleshooting steps, you should be able to identify and resolve the underlying issue causing the P1702 code