What causes a SPN3251-FMI0 code?

SPN3251-FMI0 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a SPN3251-FMI0 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN3251-FMI0 active.

How do I fix SPN3251-FMI0?

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

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OBD-II

SPN3251-FMI0

Aftertreatment 1 DPF Differential Pressure Data Valid But Above Normal

What it means

Cummins fault code 1921. DPF severely restricted.

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