SPN 2795 FMI 7 — VGT actuator position — not responding
Applies to: Detroit · Navistar · Paccar · Volvo · D13 very common
VGT actuator position — not responding.
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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.
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.