ECU 000027.04 – EGR Valve Position Signal Out of Range Low. John Deere Engine Control.

ECU 000027.04 (ECU 27.04)

Code: 000027.04

Shortcode: 27.04


The ECU 000027.04 (27.04) error code on John Deere equipment is associated with the Exhaust Gas Recirculation (EGR) valve position signal being below the lower acceptable limit. This typically indicates a short to ground within the valve’s electrical circuit. A short to ground may be caused by issues such as exposed wiring, corroded connectors, or faults within the EGR valve itself. This condition can lead to inefficient engine operation and potentially higher emissions.


When this error occurs, the John Deere engine control system may restrict the operation of the EGR valve or activate a protective mode to mitigate potential engine damage and reduce environmental impact.


  • Inspect Wiring and Connections: Check all wiring and connectors associated with the EGR valve for signs of wear, damage, or corrosion that might lead to a ground fault.
  • Diagnose the EGR Valve: Use diagnostic tools to evaluate the EGR valve’s functionality. Verify that it is not stuck open or closed and that it responds appropriately to control inputs.
  • Replace Defective Parts: If any components of the EGR system are found to be defective, replace them with genuine John Deere parts to ensure proper operation and compatibility.
  • Reset the Error Code and Test the System: After any necessary repairs or replacements, reset the error code using diagnostic equipment. Perform a comprehensive system check to confirm that the issue is resolved and that the system functions as expected.


It is important to conduct regular inspections and maintenance on the EGR system to prevent the recurrence of such faults. Early detection and repair of wiring issues or valve malfunctions can help maintain optimal engine performance and compliance with emission standards. Additionally, check the overall electrical system health, including battery and alternator, as fluctuations in the electrical system can also trigger this error.

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