ECU 000641.04 – Turbocharger Actuator Error. John Deere System Advisory.

ECU 000641.04 (ECU 641.04)

Code: 000641.04

Shortcode: 641.04


This error code, ECU 000641.04, is set when the turbocharger actuator is disabled after multiple unsuccessful attempts to power the controller or perform the actuator learning procedure. This indicates a possible malfunction or calibration issue with the turbo actuator.


The ECU disables the turbocharger actuator to prevent further attempts and potential damage to the turbo system.


  • Inspect Turbo Actuator: Check the turbocharger actuator for any signs of mechanical or electrical failure.
  • Verify Power Supply: Ensure that the actuator is receiving the correct power supply and that there are no issues with the wiring or connectors.
  • Perform Actuator Learning Procedure: Attempt to re-run the actuator learning procedure using the appropriate diagnostic tools and follow the manufacturer’s guidelines.
  • Replace Actuator if Necessary: If the actuator continues to fail the learning procedure or is found to be defective, replace it.
  • Reset ECU and Verify Operation: After repairs, reset the ECU and verify that the turbocharger actuator is functioning correctly and that no further errors are detected.


Proper calibration and functioning of the turbocharger actuator are essential for optimal turbo performance and engine efficiency. Regular maintenance and timely diagnostics can prevent actuator-related issues.

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