ECU 000051.14 – Air Throttle Actuator and EGR Valve Connectors Swapped. John Deere Engine Control.

ECU 000051.14 (ECU 51.14)

Code: 000051.14

Shortcode: 51.14


The ECU 000051.14 (51.14) error code on John Deere machinery indicates a configuration error where the connectors for the air throttle actuator and the Exhaust Gas Recirculation (EGR) valve have been swapped. This misconnection leads to improper communication and control signals between the engine control unit (ECU) and these components, potentially causing incorrect operation or failure of both systems.


In response to this error, the John Deere engine control system may enter a protective mode to prevent damage by limiting engine performance and ensuring that neither the air throttle nor the EGR valve operates under incorrect control signals.


  • Verify Connector Configurations: Check the wiring harnesses to ensure that the air throttle actuator and EGR valve connectors are correctly installed. Reference the service manual for proper connector placement.
  • Reconnect Properly: If the connectors are found to be swapped, disconnect them and reconnect each to its respective component as per the manufacturer’s specifications.
  • System Reset and Diagnostics: After correcting the connections, reset the ECU to clear the error code. Perform diagnostic tests to confirm that both the air throttle actuator and the EGR valve are receiving and responding to appropriate control signals.
  • Test Engine Performance: Conduct a comprehensive engine test under various operating conditions to ensure that all systems are functioning correctly and efficiently.


It is essential to pay close attention to the labeling and routing of wiring harnesses during maintenance or any replacement activities to prevent similar issues. Training maintenance personnel on the detailed setup of engine control systems and conducting regular audits of work performed can reduce the risk of such errors. Additionally, implementing a checklist for post-maintenance checks can help ensure that all connections are correct before the equipment is returned to service.

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