WOMS
P code powertrain High severity

P0220 Throttle/Pedal Position Sensor/Switch B Circuit Malfunction

The OBD2 code P0220 indicates a malfunction in the throttle or pedal position sensor/switch B circuit, which can affect the engine's throttle response and performance

Definition

The OBD2 code P0220 indicates a malfunction in the throttle or pedal position sensor/switch B circuit, which can affect the engine's throttle response and performance

Common causes

  • Faulty throttle position sensor (TPS)
  • Damaged wiring or connectors
  • Poor electrical connections
  • Faulty accelerator pedal position sensor
  • Malfunctioning engine control module (ECM)
  • Corrosion in the sensor circuit
  • Mechanical issues with the throttle body
  • Software issues or glitches in the ECM

Common misdiagnoses

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

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 the Throttle Position Sensor (TPS)

    Locate the throttle position sensor and visually inspect it for any signs of damage, corrosion, or loose connections

  3. 3. Ensure that the wiring harness and connectors are secure and free from dirt or moisture

  4. 4. Test the Throttle Position Sensor

    Use a multimeter to test the TPS. Check the resistance and voltage output according to the manufacturer’s specifications

  5. 5. If the readings are outside the specified range, the sensor may be faulty and should be replaced

  6. 6. Check the Pedal Position Sensor

    Similar to the TPS, inspect the pedal position sensor for damage and ensure connections are secure

  7. 7. Test the pedal position sensor using a multimeter to verify its operation

  8. 8. Inspect Wiring and Connectors

    Check the wiring and connectors between the throttle position sensor, pedal position sensor, and the Engine Control Module (ECM) for any signs of wear, fraying, or short circuits

  9. 9. Look for any signs of chafing or damage that could cause intermittent connections

  10. 10. Check for Ground Issues

    Ensure that the ground connections for the throttle and pedal position sensors are secure and free from corrosion

  11. 11. A poor ground can lead to erratic sensor readings

  12. 12. Examine the ECM

    If all sensors and wiring appear to be functioning correctly, the issue may lie within the Engine Control Module itself

  13. 13. Check for any software updates or recalls related to the ECM

  14. 14. Clear Codes and Test Drive

    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 code reappears

  16. 16. Consult Repair Manual

    Refer to the vehicle’s service manual for specific testing procedures and specifications related to the throttle and pedal position sensors

  17. 17. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic for further diagnosis and repair.Additional Tips: - Always ensure that the vehicle is in a safe condition to work on, and take necessary precautions when handling electrical components. - Document any changes or repairs made during the troubleshooting process for future reference. By following these steps, you should be able to identify the cause of the P0220 code and take appropriate action to resolve the issue