Home › Fault codes › SPN 102 FMI 0
SPN 102 FMI 0 — Boost pressure high
SeriousEnginePower derate likely — plan to stop soon
Applies to: Detroit · Navistar · Volvo
Boost pressure 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
- Overboost
- Stuck VGT vanes
- Wastegate issue
- Stuck VGT
- VGT stuck closed
First moves (roadside)
- Scan live data actual vs commanded boost
- Check VGT operation
- Compare actual vs commanded
- Live data comparison actual vs commanded
FAQ
What does SPN 102 FMI 0 mean?
Boost pressure high.
How serious is SPN 102 FMI 0?
Serious — Power derate likely — plan to stop soon.
What's the most likely cause of SPN 102 FMI 0?
The most common cause is: Overboost. Other possibilities include Stuck VGT vanes; Wastegate issue; Stuck VGT; VGT stuck closed.
Can I keep driving with SPN 102 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.