Home › Fault codes › SPN 174 FMI 16
SPN 174 FMI 16 — Fuel temperature high
SeriousEnginePower derate likely — plan to stop soon
Applies to: Volvo
Fuel temperature high.
Don't risk it — get a diesel tech on the truck.
Your SPN/FMI rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Restricted return
- Fuel cooler (if equipped)
- Hot fuel
First moves (roadside)
- Check return line flow
- Top off tank
FAQ
What does SPN 174 FMI 16 mean?
Fuel temperature high.
How serious is SPN 174 FMI 16?
Serious — Power derate likely — plan to stop soon.
What's the most likely cause of SPN 174 FMI 16?
The most common cause is: Restricted return. Other possibilities include Fuel cooler (if equipped); Hot fuel.
Can I keep driving with SPN 174 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.