SPN 2795 FMI 7 — VGT actuator position — not responding
What it means: VGT actuator position — not responding.
How serious / can you keep driving: Serious. Power derate likely — plan to stop soon.
Check first: Remove and inspect nozzle ring movement
Don't risk it — look up listed providers near you and give them this SPN/FMI when you call.
Listed providers nearest Billings, MT
Closest first. Tell them SPN 2795 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 Billings, MT · (406) 245-8985
- 0.0 mi away — based in Billings, MT · (406) 252-8413
- 0.0 mi away — based in Billings, MT · (406) 780-3711
Applies to: Detroit · Navistar · Paccar · Volvo · D13 very common
What SPN 2795 FMI 7 means
VGT actuator position — not responding.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Nozzle ring stuck
- Carbon buildup
- Actuator gear slipped
- Failed actuator
- Nozzle ring carbon
- Actuator
- Electrical
First moves (roadside)
- Remove and inspect nozzle ring movement
- Calibration attempt
- Listen for actuator movement on key-on
- Inspect nozzle ring
- Calibration
- Electrical check
- Remove and inspect nozzle ring
Common misdiagnoses
- Replacing actuator without cleaning
- Replacing before cleaning
- Replacing actuator without cleaning nozzle ring
FAQ
VGT actuator position — not responding.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Nozzle ring stuck. Other possibilities include Carbon buildup; Actuator gear slipped; Failed actuator; Nozzle ring carbon; Actuator; Electrical.
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 2795 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 position — not responding (similar to 2795) (SPN 5571 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.