WOMS
P code powertrain Medium severity

P2055 Reductant Injection Valve Circuit High Bank 1 Unit 2

The OBD2 code P2055 indicates a high voltage condition in the reductant injection valve circuit for Bank 1, Unit 2, which is part of the vehicle's emissions control system, specifically related to the selective...

Definition

The OBD2 code P2055 indicates a high voltage condition in the reductant injection valve circuit for Bank 1, Unit 2, which is part of the vehicle's emissions control system, specifically related to the selective catalytic reduction (SCR) system

Common causes

  • Faulty reductant injection valve
  • Wiring issues or short circuits in the circuit
  • Poor electrical connections
  • Failed engine control module (ECM)
  • Blocked or clogged reductant lines
  • Low reductant fluid level
  • Contaminated reductant fluid

Common misdiagnoses

  • Faulty reductant injection valve
  • Wiring issues or short circuits in the circuit
  • Defective engine control module (ECM)
  • Faulty sensors related to the reductant system
  • Issues with the diesel exhaust fluid (DEF) quality or contamination
  • Problems with the DEF tank or pump
  • Incorrectly diagnosed fuel system issues
  • Misinterpretation of related codes or symptoms

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 the Reductant Injection Valve

    Locate the reductant injection valve and visually inspect it for any signs of damage, corrosion, or leaks

  3. 3. Ensure that the valve is properly connected and that the wiring harness is intact

  4. 4. Check Electrical Connections

    Inspect the electrical connectors and wiring associated with the reductant injection valve for any signs of wear, corrosion, or loose connections

  5. 5. Use a multimeter to check for continuity in the wiring and ensure there are no breaks or shorts

  6. 6. Test the Reductant Injection Valve

    If possible, test the operation of the reductant injection valve. This may involve applying power directly to the valve to see if it opens and closes as expected

  7. 7. Measure the resistance of the valve coil with a multimeter to ensure it is within the manufacturer's specifications

  8. 8. Check the Power Supply

    Verify that the reductant injection valve is receiving the correct voltage. Use a multimeter to measure the voltage at the connector while the engine is running

  9. 9. If the voltage is too high or too low, trace the circuit back to the power source to identify any issues

  10. 10. Inspect the DEF System

    Check the diesel exhaust fluid (DEF) for contamination or quality issues. Poor quality DEF can affect the operation of the reductant injection system

  11. 11. Ensure that the DEF tank is not empty and that the fluid is at the correct level

  12. 12. Check for Blockages

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

  13. 13. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner

  14. 14. Take the vehicle for a test drive to see if the code returns. Monitor the system to ensure proper operation

  15. 15. Seek Professional Help

    If you are unable to resolve the issue, consider seeking assistance from a qualified mechanic or dealership that specializes in diesel engines and emissions systems. By following these troubleshooting steps, you should be able to identify and resolve the issue associated with the P2055 code