ECU 005127.03 – Sensor Supply Voltage 9 Out of Range High. John Deere System Advisory.

ECU 005127.03 (ECU 5127.03)

Code: 005127.03

Shortcode: 5127.03


This diagnostic trouble code indicates that the supply voltage for Sensor 9 is out of range high, typically indicating a short to 12 volts. This condition can affect the proper functioning of the sensor and its associated systems.


The ECU may limit or adjust the operation of the systems associated with Sensor 9 to manage the high supply voltage and ensure safe operation.


  • Inspect Wiring and Connections: Check for damaged, frayed, or loose wiring and connectors associated with Sensor 9. Repair or replace as necessary.
  • Test Sensor Element: Use diagnostic tools to test Sensor 9 for proper operation and correct voltage levels. Replace the sensor if it is faulty.
  • Check for Short Circuits: Inspect the circuit for any points where wires may be touching each other or the chassis, causing a short to 12 volts. Repair or insulate as needed.
  • Verify Electrical Supply: Ensure that the electrical supply to the sensor is stable and within specifications.
  • 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.


Proper electrical function of sensors is crucial for accurate data collection and system performance. Regular inspections and timely maintenance can help prevent voltage-related issues.

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