ECU 004376.14 – DEF Dosing System Powerdown Fault. John Deere System Advisory.

ECU 004376.14 (ECU 4376.14)

Code: 004376.14

Shortcode: 4376.14


This diagnostic trouble code is triggered when the DEF dosing system cannot be powered down properly. Proper power down is crucial for maintaining the integrity of the DEF system and preventing issues during subsequent startups.


The ECU may issue warnings or take preventive measures to ensure the safe operation of the DEF system, potentially impacting overall vehicle performance.


  • Inspect Powerdown Procedures: Verify that the DEF dosing system follows the correct powerdown procedures. Ensure that there are no interruptions during the powerdown process.
  • Check Wiring and Connections: Inspect all wiring and connections related to the DEF dosing system for any signs of damage, loose connections, or corrosion. Repair or replace as necessary.
  • Test DEF System Components: Use diagnostic tools to test the DEF dosing unit and associated components for proper operation.
  • Check for Software Updates: Ensure that the DEF dosing system and ECU have the latest software updates that may address powerdown issues.
  • Reset ECU and Monitor System: After addressing the issue, reset the ECU to clear the fault code and monitor the system to ensure proper powerdown procedures are followed.


Maintaining proper powerdown procedures for the DEF dosing system is essential for preventing operational issues and ensuring the longevity of the DEF system components. Regular inspections and timely maintenance can help prevent powerdown-related faults.

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