ACU 523954.07 – Invalid Calibration of Speed Band 1

ACU 523954.07 (ACU )

Code: 523954.07



The error code ACU 523954.07 is triggered when the calibration for Speed Band 1 is found to be invalid. This indicates a failure in setting or maintaining the correct calibration parameters, which is crucial for precise speed control.


To mitigate potential risks associated with improper speed control settings, the control unit has restricted certain functions, limiting the operational capacity of the machinery until the calibration issue is resolved.


  • Conduct a thorough review of the calibration settings for Speed Band 1. Ensure that all parameters align with the manufacturer’s specifications.
  • Perform a recalibration of Speed Band 1 using the proper tools and procedures as outlined in the equipment’s service manual.
  • Check for any software updates or patches that might address known issues related to calibration inaccuracies.
  • If recalibration fails to correct the issue, investigate potential hardware issues that might be affecting the calibration, such as sensor malfunctions or electrical interference.
  • Consult with a John Deere technician if the problem persists, as specialized diagnostic tools and expertise may be required to identify and resolve more complex calibration issues.


Maintaining accurate calibration is essential for the optimal performance and safety of the machinery. Regular checks and maintenance of the calibration settings should be performed to prevent such issues and ensure the equipment operates within its designed specifications.