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P code powertrain Medium severity

P222C Barometric Pressure Sensor "B" Circuit Low

The OBD2 code P222C indicates that the Barometric Pressure Sensor "B" is reporting a low voltage or signal, suggesting a potential issue with the sensor or its circuit

Definition

The OBD2 code P222C indicates that the Barometric Pressure Sensor "B" is reporting a low voltage or signal, suggesting a potential issue with the sensor or its circuit

Common causes

  • Faulty barometric pressure sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Short circuit in the sensor circuit
  • Open circuit in the sensor circuit
  • Faulty engine control module (ECM)
  • Vacuum leaks in the intake system

Common misdiagnoses

  • Faulty Barometric Pressure Sensor
  • Wiring issues or short circuits
  • Faulty Engine Control Module (ECM)
  • Vacuum leaks
  • Faulty intake air temperature sensor
  • Faulty mass air flow sensor
  • Issues with the fuel system
  • Exhaust leaks
  • Throttle body issues
  • Incorrectly calibrated sensors

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 additional context for the issue

  2. 2. Inspect the Barometric Pressure Sensor

    Locate the Barometric Pressure Sensor "B" (refer to the vehicle's service manual for its location)

  3. 3. Visually inspect the sensor for any signs of damage, corrosion, or loose connections

  4. 4. Check Wiring and Connectors

    Inspect the wiring harness and connectors leading to the Barometric Pressure Sensor for any signs of wear, fraying, or damage

  5. 5. Ensure that all connectors are securely attached and free of corrosion

  6. 6. Test the Barometric Pressure Sensor

    Use a multimeter to test the sensor's voltage and resistance according to the specifications in the service manual

  7. 7. Compare the readings to the manufacturer's specifications to determine if the sensor is functioning correctly

  8. 8. Check for Vacuum Leaks

    Inspect the intake system for any vacuum leaks that could affect the barometric pressure readings

  9. 9. Use a smoke machine or other methods to identify any leaks in the intake manifold or associated hoses

  10. 10. Inspect the Engine Control Module (ECM)

    If the sensor and wiring are in good condition, the issue may lie with the ECM

  11. 11. Check for any software updates or recalls related to the ECM that may address the issue

  12. 12. Clear Codes and Test Drive

    After performing any repairs or replacements, clear the trouble codes using the OBD-II scanner

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

  14. 14. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P222C code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  15. 15. Seek Professional Help

    If the issue persists after performing the above steps, consider seeking assistance from a qualified mechanic or dealership for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P222C code