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P2153 Fuel Injector Group "C" Supply Voltage Circuit Low

The OBD2 code P2153 indicates that there is a low voltage condition in the fuel injector group "C" supply voltage circuit, which may affect the operation of the fuel injectors in that group

Definition

The OBD2 code P2153 indicates that there is a low voltage condition in the fuel injector group "C" supply voltage circuit, which may affect the operation of the fuel injectors in that group

Common causes

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

Common misdiagnoses

  • Faulty fuel injectors
  • Bad fuel pump
  • Wiring issues or shorts
  • Faulty engine control module (ECM)
  • Fuel pressure regulator problems
  • Injector driver circuit issues
  • Bad ground connections
  • Faulty relay or fuse
  • Vacuum leaks
  • Air intake sensor malfunctions

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 Wiring and Connectors

    Visually inspect the wiring and connectors associated with 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 frayed or broken wires can cause low voltage issues

  4. 4. Test the Fuel Injector Voltage

    Use a multimeter to measure the voltage at the fuel injector connector while the engine is running. You should see a voltage reading that is within the manufacturer's specifications

  5. 5. If the voltage is low, trace the wiring back to the power source to identify any breaks or shorts

  6. 6. Check the Fuel Injector Ground

    Ensure that the ground connection for the fuel injectors is secure and free of corrosion. A poor ground can lead to low voltage readings

  7. 7. Test the ground circuit with a multimeter to ensure it is functioning properly

  8. 8. Inspect the Fuel Injector Driver Circuit

    The fuel injectors are controlled by the engine control module (ECM). Check the driver circuit from the ECM to the fuel injectors for any faults

  9. 9. If necessary, test the ECM output to ensure it is sending the correct signals to the injectors

  10. 10. Check for Short Circuits

    Inspect the wiring for any signs of short circuits to ground or to other circuits. A short can cause a drop in voltage and trigger the P2153 code

  11. 11. Test the Fuel Injectors

    If the wiring and connections are intact, test the fuel injectors themselves to ensure they are functioning properly. You can do this by measuring their resistance with a multimeter or using a fuel injector tester

  12. 12. Inspect the Power Supply

    Check the power supply to the fuel injector circuit. Ensure that the fuse related to the fuel injectors is intact and that there is no issue with the power distribution

  13. 13. Check for ECM Issues

    If all other components are functioning correctly, consider the possibility of a faulty ECM. This is less common but can happen. If you suspect the ECM, it may need to be tested or replaced

  14. 14. 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.Conclusion If you are not comfortable performing these troubleshooting steps or if the issue persists after your attempts, it may be best to consult a professional mechanic for further diagnosis and repair