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SPN 411 — EGR Differential Pressure

Safe to driveEnough to reach the yard

Updated: 2026-11-14

J1939 code SPN 411. Below — how the fault is worded at the factory by Cummins ISB, DAF, Foton and SITRAK, and what the second half of the code (FMI) means in the standard.

Cummins ISBDAFFotonSITRAK

Cummins ISB 6.7 engine

FMI 2EGR valve delta pressure signal erratic or incorrect
FMI 3EGR valve delta pressure sensor circuit voltage high
FMI 4EGR valve delta pressure sensor circuit voltage low

DAF

FMI 11Automatic cooling engine protection activated

Foton

FMI 2Accelerator pedal signal implausible

SITRAK

FMI 2EGR differential pressure across sensor below target value
FMI 3High voltage on EGR differential pressure sensor
FMI 4Low voltage on EGR differential pressure sensor
FMI 31Leak in piping downstream of EGR differential pressure sensor assembly

What FMI means in J1939

SPN 411 FMI 2411/2 · 411.2data erratic or intermittent
SPN 411 FMI 3411/3 · 411.3voltage above normal or shorted high
SPN 411 FMI 4411/4 · 411.4voltage below normal or shorted to ground
SPN 411 FMI 11411/11 · 411.11root cause not known
SPN 411 FMI 31411/31 · 411.31condition exists (see manufacturer description)

Can I keep driving

Safe to drive. Below — how much time you have and what happens if you keep going.

What happens if you keep driving

Time you have: Enough to reach the yard

Boost is not reaching its target: turbo, intercooler or intake. The engine compensates with mixture and runs hotter than usual.

You will lose pull, burn more fuel and add overheating on long climbs. If you hear a whine or a whistle from the turbo, stop — the wheel is breaking up.

This is an electrical fault: an open, a short or a bad contact in the sensor circuit. The value it measures is most likely fine. You can drive. But until the circuit is repaired this system runs blind and cannot warn you about a real failure.

What to check on the spot

Inspect the air filter and charge-air hoses: leaks and cracks produce exactly these codes.

Nearby: intake / boost

Makes with this code

SITRAKFotonDAFCummins ISB

Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.