SPN 5571 FMI 7 — VGT position — not responding (similar to 2795)
What it means: VGT position — not responding (similar to 2795).
How serious / can you keep driving: Serious. Power derate likely — plan to stop soon.
Check first: Remove and inspect nozzle ring
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 5571 FMI 7 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: Detroit · Volvo
What SPN 5571 FMI 7 means
VGT position — not responding (similar to 2795).
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
VGT position — not responding (similar to 2795).
Serious — Power derate likely — plan to stop soon.
The most common cause is: Nozzle ring stuck. Other possibilities include Actuator failure.
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 5571 FMI 7, or share the same subsystem.
- Engine Protection — Power Derate Active (SPN 1569 FMI 31)
- Intake Manifold (Charge Air) Temp — High (SPN 105 FMI 0)
- Turbo Boost Pressure — High / Overboost (SPN 1127 FMI 16)
- Boost pressure high (SPN 102 FMI 0)
- Boost sensor — voltage low (SPN 102 FMI 4)
- Intake manifold temp — voltage high (SPN 105 FMI 3)
- Intake manifold temp — voltage low (SPN 105 FMI 4)
- Injection control pressure low (HEUI — older engines) (SPN 164 FMI 1)
Same symptom: Low boost / low power
Other air-path codes that arrive as a truck that will not pull the hill it pulled yesterday.
- Turbo boost pressure high (SPN 1127 FMI 0) · Engine
- Turbo compressor inlet temp high voltage (SPN 1172 FMI 3) · Engine
- Turbo compressor inlet pressure — high voltage (SPN 1176 FMI 3) · Engine
- VGT actuator position — not responding (SPN 2795 FMI 7) · Engine
- Turbo turbine inlet temp — high voltage (SPN 5856 FMI 3) · Engine
- Turbocharger 1 Wastegate/VGT Actuator - Mechanical System Not Responding Properly (VGT vanes stuck / not tracking commanded position) (SPN 641 FMI 7) · Engine
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.