WOMS
P code powertrain Medium severity

P216B Fuel Injector Group "E" Supply Voltage Circuit Low

The OBD2 code P216B indicates that there is a low voltage issue in the fuel injector group "E" supply circuit, which may affect the performance of the fuel injectors in that group

Definition

The OBD2 code P216B indicates that there is a low voltage issue in the fuel injector group "E" supply circuit, which may affect the performance of the fuel injectors in that group

Common causes

  • Faulty fuel injector
  • Damaged wiring or connectors
  • Short circuit in the fuel injector circuit
  • Open circuit in the fuel injector circuit
  • Faulty engine control module (ECM)
  • Poor ground connection
  • Blown fuse related to the fuel injector circuit
  • Corroded connectors or terminals

Common misdiagnoses

  • Faulty fuel injectors
  • Wiring issues or shorts
  • Bad engine control module (ECM)
  • Fuel pump problems
  • Low fuel pressure
  • Injector driver circuit issues
  • Grounding problems
  • Corroded connectors
  • Battery or charging system issues
  • Faulty sensors (e.g., MAF or MAP)

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 injector group "E." Look for signs of damage, corrosion, or loose connections

  3. 3. Pay special attention to the wiring harness for any fraying, cuts, or shorts

  4. 4. Test the Fuel Injector

    Use a multimeter to check the resistance of the fuel injector. Compare the readings to the manufacturer's specifications. If the resistance is out of range, the injector may be faulty and need replacement

  5. 5. 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)

  6. 6. Also, check the ground connection for the injector. A poor ground can cause low voltage issues

  7. 7. Inspect the Fuel Injector Driver Circuit

    The fuel injector is controlled by the engine control module (ECM). Check the driver circuit from the ECM to the injector for continuity and proper operation

  8. 8. If the ECM is not sending the correct signal, it may need to be tested or replaced

  9. 9. Check for Short Circuits

    Inspect the circuit for any short circuits to ground or to other circuits that could be causing a drop in voltage

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

    If all other components check out, the issue may lie with the ECM itself. Testing or reprogramming the ECM may be necessary

  11. 11. 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

  12. 12. Seek Professional Help

    If you are unable to diagnose or fix the issue, consider seeking help from a qualified mechanic or automotive technician. By following these steps, you should be able to identify and resolve the issue related to the P216B code. Always ensure safety precautions are taken when working on a vehicle's electrical system