SPN 177 FMI 0 — Trans oil temperature very high
What it means: Trans oil temperature very high.
How serious / can you keep driving: Serious. Power derate likely — plan to stop soon.
Check first: Check cooler flow
Don't risk it — look up listed providers near you and give them this SPN/FMI when you call.
Listed providers nearest Ocala, FL
Closest first. Tell them SPN 177 FMI 0 and what the truck is doing. RoadService.app lists these providers and does not employ them or carry out the repair.
- 0.0 mi away — based in Ocala, FL · (352) 830-1899
- 0.0 mi away — based in Ocala, FL · (352) 620-0740
- 0.0 mi away — based in Ocala, FL · (352) 497-0277
Applies to: Volvo
What SPN 177 FMI 0 means
Trans oil temperature very high.
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
Trans oil temperature very high.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Cooling issue. Other possibilities include Overloaded; Stuck TCC.
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Related codes
Codes that commonly appear alongside SPN 177 FMI 0, or share the same subsystem.
- Trans oil temperature voltage high (SPN 177 FMI 3)
- Trans oil temperature voltage low (SPN 177 FMI 4)
- Main shaft speed erratic (SPN 160 FMI 2)
- Input shaft speed erratic (SPN 161 FMI 2)
- Transmission output retarder speed erratic (SPN 162 FMI 2)
- Engine speed signal abnormal update rate (SPN 190 FMI 9)
- Transmission output shaft speed erratic (SPN 191 FMI 2)
- Output shaft speed abnormal (SPN 191 FMI 8)
Same symptom: Low oil pressure
Other codes a driver sees as an oil-pressure or oil-level warning.
- Trans oil pressure voltage high (SPN 1762 FMI 3) · Drivetrain & Transmission
- Trans oil pressure voltage low (SPN 1762 FMI 4) · Drivetrain & Transmission
- Engine Oil Pressure — Extremely Low (SPN 100 FMI 1) · Lubrication
- Engine Oil Pressure Too Low (P0524) · Lubrication
- Oil pressure sensor — voltage high (SPN 100 FMI 3) · Lubrication
- Oil pressure sensor — voltage low (SPN 100 FMI 4) · Lubrication
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.