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P code powertrain High severity

P2152 Fuel Injector Group "C" Supply Voltage Circuit/Open

The OBD2 code P2152 indicates a problem with the fuel injector group "C" supply voltage circuit, specifically that there is an open circuit or insufficient voltage reaching the fuel injectors in that group

Definition

The OBD2 code P2152 indicates a problem with the fuel injector group "C" 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 fuel injector wiring
  • Short circuit in the fuel injector wiring
  • Faulty fuel injector
  • Failed fuel injector driver/module
  • Poor ground connection
  • Corroded or damaged connectors
  • Blown fuse related to the fuel injector circuit
  • Faulty engine control module (ECM)

Common misdiagnoses

  • Faulty fuel injectors
  • Bad fuel injector driver module
  • Wiring issues or shorts
  • Faulty engine control module (ECM)
  • Poor ground connections
  • Fuel pump issues
  • Incorrectly installed or damaged connectors
  • Vacuum leaks
  • Fuel pressure regulator problems
  • Injector pulse width 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

    Visually inspect the wiring and connectors related to the fuel injectors in group "C." Look for signs of damage, corrosion, or loose connections

  3. 3. Pay special attention to the wiring harness that connects to the fuel injectors, as well as any grounds associated with the circuit

  4. 4. Test the Fuel Injectors

    Use a multimeter to check the resistance of the fuel injectors in group "C." Compare the readings to the manufacturer's specifications

  5. 5. If the injectors are out of spec, they may need to be replaced

  6. 6. Check Power and Ground

    With the ignition on (engine off), use a multimeter to check for voltage at the fuel injector connector. You should see the specified voltage (usually around 12V)

  7. 7. Check the ground circuit for continuity. If there is no ground, trace the wiring back to the engine control module (ECM) or ground point

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

    If the wiring and injectors are in good condition, the issue may lie with the ECM. Check for any signs of damage or corrosion on the ECM connectors

  9. 9. If possible, test the ECM with a known good unit to see if the problem persists

  10. 10. Check for Short Circuits

    Inspect the wiring for any short circuits to ground or to other circuits. This can cause the supply voltage to drop or become erratic

  11. 11. Look for Fuel System Issues

    Ensure that the fuel system is functioning properly. A clogged fuel filter or failing fuel pump can affect injector performance

  12. 12. Clear Codes and Test Drive

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

  13. 13. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the P2152 code