BCU 522507.31 – Control Unit Not Calibrated. John Deere Information Advisory.

BCU 522507.31 (BCU )

Code: 522507.31



Error code BCU 522507.31 is generated when the Basic Control Unit (BCU) of a John Deere vehicle has not been calibrated, is incorrectly calibrated, or if the calibration has not been completed. This diagnostic trouble code may also occur erroneously during the calibration of the hitch, indicating a potential issue with the calibration process. The code triggers an “Information” level alarm, suggesting that it is not immediately critical but should be addressed to ensure optimal operation and system accuracy.


The BCU may not fully engage certain control functions or may operate them based on default or previously stored calibration settings, which could affect the performance and precision of operations. The system indicates this status to inform the operator or technician that a calibration check or correction might be needed.


  • Check Calibration Status: First, verify the current calibration status of the BCU to determine if the calibration was indeed incomplete or incorrect.
  • Review Error Occurrence Conditions: Assess the conditions under which the error was generated to understand whether it occurred due to a genuine calibration failure or as a transient or erroneous code during normal calibration procedures.
  • Perform Calibration If Necessary: If recalibration is needed based on the assessment, follow the manufacturer’s instructions to recalibrate the BCU. Ensure that all necessary conditions for successful calibration are met, including proper setup and environmental conditions.
  • Reset the BCU and Clear Diagnostic Codes: After successful recalibration, reset the BCU to ensure it recognizes the new calibration settings. Clear the diagnostic trouble code to confirm the issue has been resolved.
  • Monitor System Post-Calibration: After recalibration and resetting, closely monitor the system to ensure that all functionalities are performing as expected without recurrence of the calibration error.
  • Documentation and Operator Training: Update any operational manuals and training protocols to include detailed instructions on recognizing and rectifying such calibration issues. Ensure that operators are trained on the importance of correct calibration and the steps to take if calibration issues are suspected.


Calibration of control units is critical for the precise operation of advanced machinery. Proper calibration ensures that the machinery operates within specified parameters, enhancing efficiency, safety, and reliability. Regular checks and maintenance routines should include verification of calibration status to prevent operational anomalies and maintain optimal performance standards.