Detailed guide for SPN 110 FMI 0
Back to top ↑What SPN 110 FMI 0 means
SPN 110 identifies engine coolant temperature. FMI 0 indicates that coolant temperature is above the normal operating range at the most severe level.
On Detroit applications this condition is typically an engine coolant temperature high fault.
What you may notice
The truck may display a high coolant-temperature warning, check-engine light, reduced engine power or another engine-protection message. The exact protection strategy depends on the engine calibration.
What to check first
Check coolant level only when it is safe to do so and inspect the cooling system for obvious leaks.
Confirm that the radiator, fan, thermostat, water pump and coolant flow are functioning correctly. Look for airflow restrictions or other conditions that can cause actual overheating.
Compare the ECM coolant-temperature value with actual engine conditions. If the reading is implausible, inspect the temperature sensor, connector and wiring.
Important
Do not continue operating an engine that is genuinely overheating. The exact temperature thresholds and protection actions vary by manufacturer, so use the OEM service procedure for the specific engine.
Mechanic community notes for SPN 110 FMI 0
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