CCU 000110.03 – Engine Coolant Temperature Signal Out of Range High

CCU 000110.03 (CCU 110.03)

Code: 000110.03

Shortcode: 110.03


This fault code indicates that the Chassis Control Unit (CCU) has detected that the engine coolant temperature signal is higher than the normal operating range. This condition suggests that the engine is overheating, which can lead to severe engine damage.


The engine’s functionality is degraded to prevent potential damage due to high coolant temperature.


  • Check Coolant Level:
    • Verify that the coolant level is within the recommended range. Add coolant if necessary.
  • Inspect Cooling System:
    • Check the radiator, coolant hoses, and water pump for leaks, blockages, or damage. Repair or replace as necessary.
  • Inspect Coolant Temperature Sensor:
    • Ensure the coolant temperature sensor is functioning correctly and is not damaged or malfunctioning.
  • Check Thermostat:
    • Verify that the thermostat is operating correctly and is not stuck in a closed position.
  • Monitor Engine Temperature:
    • After resolving any issues, reset the CCU and monitor the engine temperature to ensure it stays within the normal range.


Regular maintenance of the cooling system, including checking coolant levels and sensor functionality, is essential for preventing engine overheating.

Control Units: John Deere

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