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SPN 411 FMI 0 — EGR diff pressure high

SeriousEnginePower derate likely — plan to stop soon

Applies to: Navistar · Paccar · Volvo · MaxxForce 13 notorious EGR cooler issues

EGR diff pressure high.

Don't risk it — get a diesel tech on the truck.

Your SPN/FMI rides along, so nearby mechanics see the fault before they quote you.

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How serious is it?

Serious. Power derate likely — plan to stop soon.

Most likely causes

  1. Plugged cooler
  2. Pressure lines
  3. Pressure hoses
  4. Plugged EGR cooler
  5. EGR cooler restricted
  6. Sensor hoses

First moves (roadside)

  1. Inspect
  2. Inspect EGR cooler and hoses
  3. Check EGR cooler and hoses

FAQ

What does SPN 411 FMI 0 mean?

EGR diff pressure high.

How serious is SPN 411 FMI 0?

Serious — Power derate likely — plan to stop soon.

What's the most likely cause of SPN 411 FMI 0?

The most common cause is: Plugged cooler. Other possibilities include Pressure lines; Pressure hoses; Plugged EGR cooler; EGR cooler restricted; Sensor hoses.

Can I keep driving with SPN 411 FMI 0?

Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.

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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.