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P code powertrain High severity

P2137 Throttle/Pedal Pos Sensor/Switch B / C Voltage Correlation

The OBD2 code P2137 indicates a voltage correlation issue between the throttle position sensor (TPS) and the accelerator pedal position sensor (APP) for circuits B and C, suggesting a discrepancy in the signals they...

Definition

The OBD2 code P2137 indicates a voltage correlation issue between the throttle position sensor (TPS) and the accelerator pedal position sensor (APP) for circuits B and C, suggesting a discrepancy in the signals they send to the engine control module (ECM)

Common causes

  • Faulty throttle position sensor
  • Faulty accelerator pedal position sensor
  • Wiring issues (shorts, opens, or corrosion)
  • Poor electrical connections
  • Faulty engine control module (ECM)
  • Mechanical issues with the throttle body
  • Calibration issues or software glitches

Common misdiagnoses

  • Throttle position sensor failure
  • Accelerator pedal position sensor failure
  • Wiring or connector issues
  • Engine control module (ECM) failure
  • Faulty accelerator pedal assembly
  • Vacuum leaks
  • Mass airflow sensor issues
  • Fuel delivery problems
  • Ignition system faults
  • Transmission issues

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues present

  2. 2. Inspect Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors associated with the throttle position sensors. Look for signs of damage, corrosion, or loose connections

  4. 4. Ensure that the connectors are securely attached and that there are no bent pins

  5. 5. Test the Throttle Position Sensors

  6. 6. Use a multimeter to measure the voltage output of the throttle position sensors (B and C). Compare the readings to the specifications provided in the vehicle's service manual

  7. 7. Check for proper voltage and ground at the sensor connectors

  8. 8. Check for Throttle Body Issues

  9. 9. Inspect the throttle body for any signs of dirt, carbon buildup, or mechanical issues that could affect the throttle position

  10. 10. Clean the throttle body if necessary, as buildup can interfere with the throttle position sensor's operation

  11. 11. Inspect the Accelerator Pedal Position Sensor

  12. 12. The accelerator pedal position sensor can also affect the throttle position. Check its wiring and operation

  13. 13. Test the sensor to ensure it is functioning correctly and providing the expected voltage output

  14. 14. Check for Software Updates

  15. 15. Sometimes, the issue can be related to software glitches in the ECM. Check with the manufacturer for any available software updates or reprogramming

  16. 16. Clear the Code and Test Drive

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

  18. 18. Take the vehicle for a test drive to see if the code reappears. Monitor the throttle response and performance during the drive

  19. 19. Replace Faulty Components

  20. 20. If any of the sensors (throttle position or accelerator pedal position) are found to be faulty, replace them as needed

  21. 21. If wiring issues are found, repair or replace the damaged wiring or connectors

  22. 22. Consult a Professional

  23. 23. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. They may have specialized tools and knowledge to identify more complex issues. By following these troubleshooting steps, you should be able to identify and resolve the underlying issue causing the P2137 code