ECU 002630.04 – Exhaust Gas Recirculation (EGR) Fresh Air Temperature Sensor Input Voltage Too Low. John Deere System Advisory.

ECU 002630.04 (ECU 2630.04)

Code: 002630.04

Shortcode: 2630.04


This error code, ECU 002630.04, occurs when the input voltage at the EGR fresh air temperature sensor falls below the minimum specified limit, indicative of a short to ground. This malfunction can lead to inaccurate temperature readings impacting the EGR system’s functionality.


To prevent damage from incorrect EGR operation, the ECU may limit engine functions based on the faulty temperature data received.


  • Inspect Sensor Wiring and Connections: Look for any potential shorts to ground in the sensor’s wiring or connectors.
  • Test Sensor Voltage: Using a multimeter, check the voltage at the sensor. Low voltage readings confirm a short to ground.
  • Repair Electrical Connections: Fix any issues with wiring or connections that are causing the low voltage.
  • Replace Faulty Sensor: If the sensor is found to be defective after electrical repairs, replace it to ensure accurate temperature monitoring.
  • Reset ECU and Perform Diagnostic Tests: After completing the repairs, reset the ECU to clear the fault codes and run diagnostic tests to confirm the sensor operates correctly.


Ensuring accurate sensor operation is essential for the EGR system to function correctly and efficiently. Frequent maintenance and prompt attention to sensor issues can prevent larger system failures.

Control Units: John Deere

John Deere Parts
John Deere Logo