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SPN 5571 FMI 7 — VGT position — not responding (similar to 2795)
SeriousEnginePower derate likely — plan to stop soon
Applies to: Detroit · Volvo
VGT position — not responding (similar to 2795).
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
- Nozzle ring stuck
- Actuator failure
First moves (roadside)
- Remove and inspect nozzle ring
- Calibration
- Clean nozzle ring
- Actuator test
FAQ
What does SPN 5571 FMI 7 mean?
VGT position — not responding (similar to 2795).
How serious is SPN 5571 FMI 7?
Serious — Power derate likely — plan to stop soon.
What's the most likely cause of SPN 5571 FMI 7?
The most common cause is: Nozzle ring stuck. Other possibilities include Actuator failure.
Can I keep driving with SPN 5571 FMI 7?
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.