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P code powertrain Medium severity

P0472 Exhaust Pressure Sensor "A" Circuit Low

The OBD2 code P0472 indicates that the exhaust pressure sensor "A" circuit is reading a low voltage, which suggests a potential issue with the sensor or its wiring

Definition

The OBD2 code P0472 indicates that the exhaust pressure sensor "A" circuit is reading a low voltage, which suggests a potential issue with the sensor or its wiring

Common causes

  • Faulty exhaust pressure sensor
  • Damaged wiring or connectors
  • Short circuit in the sensor circuit
  • Open circuit in the sensor circuit
  • Corroded or loose connections
  • Faulty engine control module (ECM)
  • Exhaust system leaks
  • Blocked or restricted exhaust system

Common misdiagnoses

  • Faulty exhaust pressure sensor
  • Wiring issues or short circuits
  • Faulty turbocharger or wastegate
  • Exhaust leaks
  • Faulty engine control module (ECM)
  • Incorrectly installed or damaged exhaust components
  • Issues with the DPF (Diesel Particulate Filter) or EGR (Exhaust Gas Recirculation) system

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 multiple issues

  2. 2. Inspect the Exhaust Pressure Sensor

    Visual Inspection: Check the exhaust pressure sensor for any visible damage, corrosion, or loose connections

  3. 3. Wiring and Connectors

    Inspect the wiring harness and connectors for fraying, breaks, or corrosion. Ensure that the connectors are securely attached

  4. 4. Test the Exhaust Pressure Sensor

    Voltage Test: Use a multimeter to check the voltage output of the exhaust pressure sensor. Compare the readings to the specifications provided in the vehicle’s service manual

  5. 5. Ground Test

    Ensure that the sensor has a good ground connection. A poor ground can lead to incorrect readings

  6. 6. Check for Vacuum Leaks

    Inspect the intake and exhaust systems for any vacuum leaks that could affect the sensor's readings. Use a smoke machine or other methods to identify leaks

  7. 7. Inspect the Exhaust System

    Check for any blockages or restrictions in the exhaust system that could affect exhaust pressure readings. This includes checking the catalytic converter and muffler

  8. 8. Test the Wiring

    Perform a continuity test on the wiring between the exhaust pressure sensor and the Engine Control Module (ECM). Look for any breaks or shorts in the wiring

  9. 9. Check the Engine Control Module (ECM)

    If all other components are functioning correctly, the issue may lie with the ECM itself. Check for software updates or reprogramming if necessary

  10. 10. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  11. 11. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P0472 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues or fixes

  12. 12. Seek Professional Help

    If you are unable to resolve the issue after these steps, consider consulting a professional mechanic or technician who has experience with your vehicle’s make and model. By following these steps, you should be able to identify the cause of the P0472 code and take appropriate action to resolve it