ECU 000105.03 – High Voltage Detected at EGR Mixed Air Temperature Sensor. John Deere System Advisory.

ECU 000105.03 (ECU 105.03)

Code: 000105.03

Shortcode: 105.03


Error code ECU 000105.03 indicates that the input voltage at the exhaust gas recirculation (EGR) mixed air temperature sensor is too high, suggesting a potential short to a 12-volt source. This could lead to erroneous temperature readings, affecting the EGR system’s ability to properly manage engine temperatures and emissions.


The ECU might adjust engine parameters based on incorrect temperature data, potentially leading to inefficient engine operation or increased emissions.


  • Inspect Electrical Connections: Check the sensor and its circuit for any signs of damage or corrosion that could cause a short circuit.
  • Test Sensor Voltage: Use a multimeter to confirm if the sensor voltage exceeds normal levels and identify the source of the high voltage.
  • Replace Damaged Wiring or Sensor: Repair or replace any damaged wiring or components to ensure accurate temperature readings.
  • ECU Reset and Diagnostic Code Removal: After repairs, reset the ECU and clear the diagnostic codes to restore normal function.


Ensuring that all electrical systems within the EGR pathway are secure and intact is key to maintaining reliable operation and compliance with emission standards. Regular inspections can help identify and rectify such issues before they lead to more significant engine problems.

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