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P code powertrain High severity

P20CE Exhaust Aftertreatment Fuel Injector "A" Control Circuit High

The OBD2 code P20CE indicates a problem with the control circuit for the exhaust aftertreatment fuel injector "A," specifically that the circuit is reading a high voltage or signal, which may suggest a short circuit or...

Definition

The OBD2 code P20CE indicates a problem with the control circuit for the exhaust aftertreatment fuel injector "A," specifically that the circuit is reading a high voltage or signal, which may suggest a short circuit or malfunction in the injector or its wiring

Common causes

  • Faulty exhaust aftertreatment fuel injector
  • Short circuit in the wiring harness
  • Open circuit in the wiring harness
  • Corroded or damaged connectors
  • Faulty engine control module (ECM)
  • Incorrect fuel pressure
  • Faulty fuel injector driver circuit

Common misdiagnoses

  • Faulty fuel injector
  • Wiring issues or short circuits
  • Defective engine control module (ECM)
  • Fuel system problems
  • Exhaust system leaks
  • Incorrect fuel type
  • Faulty sensors (e.g., oxygen sensor, temperature sensor)
  • Clogged fuel filter
  • Injector driver circuit issues
  • Software or calibration errors in the ECM

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 Wiring and Connectors

    Visually inspect the wiring and connectors associated with the exhaust aftertreatment fuel injector. Look for

  3. 3. Damaged, frayed, or corroded wires

  4. 4. Loose or corroded connectors

  5. 5. Signs of short circuits or grounding issues

  6. 6. Test the Fuel Injector

    If accessible, test the exhaust aftertreatment fuel injector for proper operation. This may involve

  7. 7. Checking the resistance of the injector coil with a multimeter

  8. 8. Ensuring that the injector is not clogged or malfunctioning

  9. 9. Check the Control Circuit

    Use a multimeter to check the voltage and ground at the injector connector

  10. 10. Ensure that the voltage is within the manufacturer's specifications

  11. 11. Check for proper ground connection

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

    The ECM controls the fuel injector. If the wiring and injector are functioning correctly, the issue may lie within the ECM

  13. 13. Check for software updates or reprogramming needs

  14. 14. Inspect for any signs of damage or failure

  15. 15. Look for Exhaust System Issues

    Inspect the exhaust system for any blockages or restrictions that could affect the operation of the aftertreatment system

  16. 16. Check for Fuel Quality

    Ensure that the fuel being used meets the specifications required for the vehicle. Poor-quality fuel can lead to injector issues

  17. 17. Clear Codes and Test Drive

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

  18. 18. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the specific make and model of the vehicle, as manufacturers may have issued guidance on common issues related to the P20CE code

  19. 19. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with diesel engines and aftertreatment systems. By following these troubleshooting steps, you can systematically identify and resolve the issue associated with the P20CE code