SPN 411 FMI 0 — EGR diff pressure high
Applies to: Navistar · Paccar · Volvo · MaxxForce 13 notorious EGR cooler issues
EGR diff pressure high.
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
- Plugged cooler
- Pressure lines
- Pressure hoses
- Plugged EGR cooler
- EGR cooler restricted
- Sensor hoses
First moves (roadside)
- Inspect
- Inspect EGR cooler and hoses
- Check EGR cooler and hoses
FAQ
EGR diff pressure high.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Plugged cooler. Other possibilities include Pressure lines; Pressure hoses; Plugged EGR cooler; EGR cooler restricted; Sensor hoses.
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.