BCU 523759.11 – Unrealistic Value Detected from S44 Remote Control Switch for Rear PTO (Left). John Deere System Advisory.

BCU 523759.11 (BCU )

Code: 523759.11



Diagnostic trouble code BCU 523759.11 is issued when the Body Control Unit (BCU) detects an unrealistic value from the S44 remote control switch for the rear Power Take-Off (PTO) on the left side. This anomaly suggests a malfunction within the switch or its associated circuitry, potentially due to faulty wiring, a defective switch, or interference compromising the signal sent to the BCU.


In response to this fault, the system may deactivate the function of the rear PTO (left) to prevent incorrect or unsafe operation. The system will likely alert the operator through diagnostic indicators or error messages, aiming to mitigate any risk of damage or inefficiency.


  • Inspect the S44 Switch and Wiring: Examine the S44 remote control switch and its connected wiring for any visible signs of damage, wear, or loose connections that could be impacting the switch’s functionality.
  • Test the Switch Operation: Employ diagnostic tools to evaluate the functionality of the switch, checking if the signal output corresponds with expected values for different switch positions.
  • Replace or Repair Faulty Components: Should any components of the switch mechanism or wiring be found faulty, proceed with repairs or replacements to ensure the switch operates correctly.
  • Ensure Signal Integrity: After addressing any physical issues, verify that the signal from the switch to the BCU is accurate and consistent with operational requirements.
  • System Reset and Testing: Clear any related fault codes from the BCU and conduct tests to confirm the rear PTO now operates correctly and responds appropriately to the remote control switch.


Regular checks and timely maintenance of electrical components, such as remote control switches for PTO systems, are critical for maintaining the operational reliability and safety of agricultural equipment. Promptly addressing errors like unrealistic signal values can prevent further mechanical or electrical issues, ensuring that the machinery remains effective and safe for use.