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P code powertrain High severity

P2155 Fuel Injector Group "D" Supply Voltage Circuit/Open

The OBD2 code P2155 indicates a problem with the fuel injector group "D" supply voltage circuit, specifically that there is an open circuit or insufficient voltage reaching the fuel injectors in that group

Definition

The OBD2 code P2155 indicates a problem with the fuel injector group "D" supply voltage circuit, specifically that there is an open circuit or insufficient voltage reaching the fuel injectors in that group

Common causes

  • Open circuit in the wiring
  • Short circuit in the wiring
  • Faulty fuel injector
  • Failed fuel injector driver/module
  • Poor ground connection
  • Corroded or damaged connectors
  • Blown fuse
  • Faulty engine control module (ECM)

Common misdiagnoses

  • Faulty fuel injectors
  • Wiring issues
  • Fuel pump problems
  • Engine control module (ECM) failure
  • Short circuits in the wiring harness
  • Bad ground connections
  • Fuel pressure regulator issues
  • Injector driver circuit problems
  • Corroded connectors
  • Battery or charging system issues

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 for the issue

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring and connectors related to the fuel injectors in group "D" for any signs of damage, corrosion, or loose connections

  3. 3. Continuity Test

    Use a multimeter to check for continuity in the wiring from the engine control module (ECM) to the fuel injectors. Look for breaks or shorts in the wiring

  4. 4. Check Fuel Injector Operation

    Resistance Test: Measure the resistance of the fuel injectors in group "D" using a multimeter. Compare the readings to the manufacturer's specifications. If any injector is out of spec, it may need to be replaced

  5. 5. Injector Pulse Test

    Use a noid light or an oscilloscope to check if the ECM is sending a signal to the injectors. If there is no signal, the issue may lie with the ECM or the wiring

  6. 6. Inspect the Fuel Injector Driver Circuit

    Check the fuel injector driver circuit in the ECM. If the ECM is not providing the correct voltage or signal to the injectors, it may need to be repaired or replaced

  7. 7. Check Power and Ground

    Power Supply: Verify that the fuel injectors are receiving the correct voltage from the power supply. Use a multimeter to check the voltage at the injector connector

  8. 8. Ground Connection

    Ensure that the ground connection for the fuel injectors is solid and free of corrosion

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

    If all other components check out, the ECM may be faulty. Testing or replacing the ECM should be done as a last resort after ruling out other issues

  10. 10. Clear Codes and Test Drive

    After performing repairs or replacements, 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. Seek Professional Help

    If you are unable to diagnose or fix the issue, consider seeking help from a professional mechanic or automotive technician. By following these steps, you should be able to identify and resolve the issue related to the P2155 code