ECU 002630.03 – Exhaust Gas Recirculation (EGR) Fresh Air Temperature Sensor Input Voltage Too High. John Deere System Advisory.

ECU 002630.03 (ECU 2630.03)

Code: 002630.03

Shortcode: 2630.03


Error code ECU 002630.03 is triggered when the input voltage to the exhaust gas recirculation (EGR) fresh air temperature sensor exceeds the maximum specified limit, indicating a short to 12 volts. This error can result in erroneous temperature readings that may affect the EGR system’s performance.


The ECU may modify engine performance parameters or limit functionality to prevent potential damage due to incorrect EGR operation based on faulty temperature data.


  • Inspect Wiring and Connectors: Check the sensor wiring and connectors for any signs of damage or corrosion that might cause a short to 12 volts.
  • Measure Voltage at Sensor: Use a multimeter to measure the voltage at the sensor connection. A reading higher than specified suggests a short.
  • Replace Damaged Wiring: Repair or replace any damaged wiring that could be causing the high voltage condition.
  • Test or Replace Sensor: If the wiring is intact, test the sensor itself for faults. Replace the sensor if it fails the tests.
  • Verify System Operation: After repairs, reset the ECU and test the EGR system under various operating conditions to ensure the sensor now functions within normal parameters.


Proper functioning of the EGR temperature sensor is crucial for maintaining efficient engine operation and compliance with emission standards. Regular checks and timely repairs are essential.

Control Units: John Deere

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