ECU 000111.18 – Low Coolant Level at Moderate Temperature. John Deere System Advisory.

ECU 000111.18 (ECU 111.18)

Code: 000111.18

Shortcode: 111.18


Error code ECU 000111.18 indicates that the coolant level is low while the engine is operating at moderate temperatures. This condition might not trigger immediate overheating but can lead to potential issues if coolant levels continue to decrease.


The engine management system may issue alerts and initiate precautionary measures to prevent potential overheating, ensuring the engine remains within safe operational temperatures.


  • Refill and Monitor Coolant Levels: Immediately top up the coolant to the specified level and monitor for any further drops to detect leaks.
  • Inspect Cooling System for Leaks: Check all hoses, connections, and the radiator for signs of leakage.
  • Evaluate Coolant System Components: Ensure the integrity of the coolant pump and the radiator cap.
  • Reset ECU and Clear Diagnostic Codes: After corrective actions, reset the ECU to clear the fault code and ensure accurate coolant level monitoring.


Maintaining proper coolant levels is essential for engine health, especially to prevent issues during fluctuating operating temperatures.

Control Units: John Deere

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