ECU 522590.12 – Sensor Supply #1 Voltage Error. John Deere System Advisory.

ECU 522590.12 (ECU )

Code: 522590.12



This diagnostic trouble code indicates that the ECU detected a voltage error in sensor supply one. This can affect the proper operation of any sensors relying on this supply voltage, leading to incorrect sensor readings and potential engine performance issues.


The ECU may limit or adjust the operation of the engine to manage the sensor supply voltage error, potentially resulting in reduced engine performance and efficiency.


  • Inspect Wiring and Connections: Check for damaged, frayed, or loose wiring and connectors associated with sensor supply one. Repair or replace as necessary.
  • Test Sensor Supply Voltage: Use diagnostic tools to measure the voltage of sensor supply one and ensure it is within specifications.
  • Check for Short Circuits or Open Circuits: Inspect the circuit for any points where wires may be touching ground, causing a short circuit, or any breaks causing an open circuit. Repair or insulate as needed.
  • Verify Sensor Function: Ensure that the sensors relying on sensor supply one are functioning correctly and providing accurate readings.
  • Reset ECU and Monitor System: After resolving the issue, reset the ECU to clear the fault code and monitor the system to ensure normal operation.


Maintaining proper voltage supply to sensors is crucial for accurate engine monitoring and control. Regular inspections and timely maintenance can help prevent voltage-related issues.

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