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SPN 110 FMI 16 — Coolant temperature — moderately high
SeriousEnginePower derate likely — plan to stop soon
Applies to: Detroit
Coolant temperature — moderately high.
Don't risk it — get a diesel tech on the truck.
Look up listed providers near you and give them this SPN/FMI when you call.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Cooling issue
- Fan clutch
- Thermostat
First moves (roadside)
- Check level/thermostat/fan
FAQ
What does SPN 110 FMI 16 mean?
Coolant temperature — moderately high.
How serious is SPN 110 FMI 16?
Serious — Power derate likely — plan to stop soon.
What's the most likely cause of SPN 110 FMI 16?
The most common cause is: Cooling issue. Other possibilities include Fan clutch; Thermostat.
Can I keep driving with SPN 110 FMI 16?
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Throwing this code right now?
Find a mechanic or related guides
General diagnostic guidance for heavy-duty diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack). Not a substitute for a scan-tool diagnosis on your specific truck.