Cummins Fault Code

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SPN 3251 FMI 0

High DPF Differential Pressure

System

Aftertreatment

Symptom

High DPF Differential Pressure

Diagnosis & fix steps

LOGIC: DPF soot load critically high. ACTION: Forced stationary regen. If delta-P is still high, DPF requires baking/cleaning.

Red Seal field insights

Specs: Max Delta-P 15-20 kPa. PRO-TIP: Check for "face plugging" at the DPF inlet.

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