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U010E Lost Communication With Reductant Control Module

The OBD2 code U010E indicates a loss of communication between the engine control module (ECM) and the reductant control module, which is responsible for managing the diesel exhaust fluid (DEF) system in vehicles...

Definition

The OBD2 code U010E indicates a loss of communication between the engine control module (ECM) and the reductant control module, which is responsible for managing the diesel exhaust fluid (DEF) system in vehicles equipped with selective catalytic reduction (SCR) technology

Common causes

  • Faulty reductant control module
  • Damaged wiring or connectors
  • Poor electrical connections
  • Failed or malfunctioning sensors
  • Software issues or programming errors
  • Blown fuses
  • Corrosion or dirt in connectors
  • Issues with the vehicle's power supply

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective reductant control module
  • Failed engine control module (ECM)
  • Issues with the diesel exhaust fluid (DEF) system
  • Faulty sensors related to the reductant system
  • Software issues or updates needed in the ECM
  • Problems with the vehicle's CAN bus communication
  • Low battery voltage or power supply issues

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 other issues present

  2. 2. Inspect Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors related to the reductant control module. Look for signs of damage, corrosion, or loose connections

  4. 4. Ensure that all connectors are securely plugged in and that there are no bent pins

  5. 5. Check Power and Ground

  6. 6. Verify that the reductant control module is receiving the proper power supply. Use a multimeter to check voltage at the module's connector

  7. 7. Check for a good ground connection as well

  8. 8. Test the Reductant Control Module

  9. 9. If the wiring and connections are intact, the issue may lie with the reductant control module itself. If possible, test the module according to the manufacturer's specifications or replace it with a known good unit to see if the problem persists

  10. 10. Inspect the CAN Bus

  11. 11. The communication between modules in the vehicle is often done via a Controller Area Network (CAN) bus. Check for any issues with the CAN bus wiring or connections that could be causing communication problems

  12. 12. Check for Software Updates

  13. 13. Sometimes, communication issues can be resolved with a software update. Check with the vehicle manufacturer or a dealership to see if there are any available updates for the vehicle's ECU or the reductant control module

  14. 14. Clear Codes and Test Drive

  15. 15. After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  16. 16. Consult Technical Service Bulletins (TSBs)

  17. 17. Look for any TSBs related to the U010E code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  18. 18. Professional Diagnosis

  19. 19. If the issue persists after performing the above steps, it may be necessary to seek assistance from a professional mechanic or dealership with experience in diagnosing communication issues in the vehicle's electronic systems. By following these steps, you should be able to identify and resolve the issue causing the U010E code