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SPN 177 FMI 0 — Trans oil temperature very high
SeriousTransmissionPower derate likely — plan to stop soon
Applies to: Volvo
Trans oil temperature very 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
- Cooling issue
- Overloaded
- Stuck TCC
First moves (roadside)
- Check cooler flow
- Load operation
FAQ
What does SPN 177 FMI 0 mean?
Trans oil temperature very high.
How serious is SPN 177 FMI 0?
Serious — Power derate likely — plan to stop soon.
What's the most likely cause of SPN 177 FMI 0?
The most common cause is: Cooling issue. Other possibilities include Overloaded; Stuck TCC.
Can I keep driving with SPN 177 FMI 0?
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.