WOMS
P code powertrain Medium severity

P044E Exhaust Gas Recirculation Sensor "C" Circuit Intermittent/Erratic

The OBD2 code P044E indicates that there is an intermittent or erratic issue with the Exhaust Gas Recirculation (EGR) sensor "C" circuit, which may affect the proper functioning of the EGR system

Definition

The OBD2 code P044E indicates that there is an intermittent or erratic issue with the Exhaust Gas Recirculation (EGR) sensor "C" circuit, which may affect the proper functioning of the EGR system

Common causes

  • Faulty EGR sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Vacuum leaks
  • Faulty EGR valve
  • Malfunctioning engine control module (ECM)
  • Corroded terminals
  • Software issues in the ECM
  • Blocked EGR passages

Common misdiagnoses

  • Faulty EGR valve
  • Vacuum leaks
  • Faulty EGR sensor
  • Wiring issues or shorts
  • Faulty engine control module (ECM)
  • Clogged EGR passages
  • Faulty intake manifold pressure sensor
  • Fuel system issues
  • Ignition system problems
  • Exhaust leaks

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 EGR System

    Visual Inspection: Check the EGR valve and associated components for any visible damage, corrosion, or loose connections

  3. 3. Wiring and Connectors

    Inspect the wiring harness and connectors related to the EGR sensor for fraying, corrosion, or poor connections. Repair or replace as necessary

  4. 4. Test the EGR Sensor

    Resistance Check: Use a multimeter to measure the resistance of the EGR sensor. Compare the readings to the manufacturer’s specifications

  5. 5. Voltage Check

    With the ignition on (engine off), check the voltage at the EGR sensor connector. Ensure it matches the expected values

  6. 6. Check for Vacuum Leaks

    Inspect the vacuum lines connected to the EGR system for any leaks or blockages. A vacuum leak can cause erratic sensor readings

  7. 7. Inspect the EGR Valve

    Ensure that the EGR valve is functioning properly. It should open and close as commanded by the engine control module (ECM). You can test it by applying vacuum to the valve and observing its operation

  8. 8. Check for Exhaust Blockages

    Inspect the exhaust system for any blockages that could affect EGR operation. This includes checking the EGR passages for carbon buildup

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

    If all other components check out, the issue may lie with the ECM itself. Ensure that the ECM is functioning correctly and is not causing erratic signals

  10. 10. Clear Codes and Test Drive

    After performing repairs or adjustments, clear the trouble codes using the OBD-II scanner 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 P044E code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  12. 12. Seek Professional Help

    If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic who has experience with EGR systems and OBD-II diagnostics. By following these steps, you should be able to identify the root cause of the P044E code and take appropriate action to resolve it