What are the most likely causes of SPN 110 FMI 0?

Low coolant level or a leak; Radiator or CAC plugged with debris; Fan clutch not engaging

How do you diagnose code SPN 110 FMI 0?

1) Check coolant level cold and look for leaks — Level at the mark, no leak traces 2) Inspect the radiator and CAC against a light — Clean fins, light visible through the core 3) Verify fan engagement — Fan engages when commanded

What part is usually replaced for SPN 110 FMI 0 and how much does it cost?

Coolant temperature sensor: $40–$180 USD (aftermarket to dealer), plus 0.5–1 h of labor.

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SPN 110 FMI 0

Q: What does truck fault code SPN 110 FMI 0 mean?

Coolant is running too hot: engine damage risk. Coolant temperature went above the engine protection threshold. The ECM will pull power and may shut the engine down. Park safely and let it cool before opening anything in the cooling system.

STOP

High temperature

Coolant is running too hot: engine damage risk.

SPN 110 FMI 0: Coolant is running too hot: engine damage risk. Stop: this is a stop-now code. Park safely and do not keep driving until it is checked.

Mechanical · Cooling

Can I keep driving?

Stop: this is a stop-now code. Park safely and do not keep driving until it is checked.

What it means

Coolant temperature went above the engine protection threshold. The ECM will pull power and may shut the engine down. Park safely and let it cool before opening anything in the cooling system.

Most likely causes

Low coolant level or a leak
Very likely
Radiator or CAC plugged with debris
Very likely
Fan clutch not engaging
Likely
Thermostat stuck closed
Likely

Tests, cheapest and most decisive first

1. Check coolant level cold and look for leaks
Expected result: Level at the mark, no leak traces
2. Inspect the radiator and CAC against a light
Expected result: Clean fins, light visible through the core
3. Verify fan engagement
Expected result: Fan engages when commanded
Tool: J1939 scanner