SPN 2791 FMI 7 — EGR valve — not responding
What it means: EGR valve — not responding.
How serious / can you keep driving: Serious. Power derate likely — plan to stop soon.
Check first: Inspect EGR valve for carbon
Don't risk it — look up listed providers near you and give them this SPN/FMI when you call.
Listed providers nearest Salt Lake City, UT
Closest first. Tell them SPN 2791 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 Salt Lake City, UT · (801) 531-9256
- 0.0 mi away — based in Salt Lake City, UT · (385) 503-8084
- 0.0 mi away — based in Salt Lake City, UT · (385) 386-4700
Applies to: Detroit · Navistar · Paccar · Volvo · MaxxForce 13 very common · Very common on D13
What SPN 2791 FMI 7 means
EGR valve — not responding.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Carbon packing on valve
- Valve stuck
- Actuator failed
- Carbon
- Actuator
- Carbon buildup
- Actuator failure
First moves (roadside)
- Inspect EGR valve for carbon
- Actuation test
- Inspect EGR
- Inspect valve
- Inspect EGR valve
Common misdiagnoses
- Replacing valve without inspecting stem
- Replacing before inspecting
FAQ
EGR valve — not responding.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Carbon packing on valve. Other possibilities include Valve stuck; Actuator failed; Carbon; Actuator; Carbon buildup; 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 2791 FMI 7, or share the same subsystem.
- SCR Operator Inducement — Severe Derate Active (SPN 5246 FMI 0)
- Aftertreatment 1 Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating Range, Most Severe Level (DPF severely restricted / plugged) (SPN 3251 FMI 0)
- Aftertreatment 1 Diesel Exhaust Fluid Quality - Data Valid But Below Normal Operating Range, Most Severe Level (DEF quality/concentration incorrect) (SPN 4364 FMI 1)
- DPF Differential Pressure — Data Erratic (SPN 3251 FMI 2)
- DEF Dosing Unit — Not Responding Properly (SPN 3361 FMI 7)
- SCR Conversion Efficiency — Below Threshold (SPN 4364 FMI 18)
- DEF Quality — Out of Spec (SPN 4094 FMI 31)
- EGR Temperature — Too High (SPN 412 FMI 0)
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.