ACU 524017.31 – Neutral Switch/Forward Slot Voltage Irregularity

ACU 524017.31 (ACU )

Code: 524017.31



This error code, ACU 524017.31, signals that the voltage from the neutral switch or forward slot is out of the expected range, indicating an indeterminate state between open and closed positions. This ambiguity can cause confusion in transmission control systems, leading to potential operational hazards.


In response to this unclear indication from the switch, the control unit has defaulted the machinery to neutral to prevent unintended movements and ensure operator safety.


  • Inspect the neutral switch and forward slot for mechanical faults or wear that could be affecting their ability to clearly indicate their position.
  • Use a multimeter to measure the voltage levels at the switch to verify if they fall within the designated range for clear open or closed states. This measurement can help determine if the issue is due to electrical faults or mechanical malfunctions.
  • Check the wiring and connections leading to the switch for any signs of damage, corrosion, or loose connections that could be affecting signal clarity.
  • Recalibrate or replace the neutral switch or forward slot components if they are found to be defective or not functioning as intended.
  • If the issue persists after these corrective measures, it may be advisable to consult with a John Deere certified technician who can perform a more thorough diagnostic evaluation and potentially update system firmware or replace additional components.


Regular checks and maintenance of the transmission system’s electrical components are crucial for ensuring that switches like the neutral and forward slot operate correctly. Accurate voltage readings and clear position indications are essential for safe and reliable machinery operation.