← All fault codes

SPN 3251 / FMI 0

DPF Differential Pressure — Above Normal (Most Severe)

High
SAE J1939 dpf SPN 3251 FMI 0
What it means

Aftertreatment 1 diesel particulate filter differential pressure very high — severe soot/ash loading or failed regen.

Seeing SPN 3251 / FMI 0?

Run a free AI diagnosis for your engine — causes ranked by real-world fix rates, with TSBs and parts.

Run a free diagnosis
Related codes
SPN 3246 / FMI 0

DPF Outlet Gas Temperature — Above Normal (Most Severe)

dpfHigh
 SPN 3251 / FMI 2

DPF Differential Pressure — Data Erratic

dpfMedium
 SPN 3719 / FMI 0

DPF Soot Load — Very High (Most Severe)

dpfCritical
 SPN 3719 / FMI 15

DPF Soot Load — High (Least Severe)

dpfMedium
 SPN 3720 / FMI 16

DPF Ash Load — High (Moderate)

dpfMedium
 P2002

Diesel Particulate Filter Efficiency Below Threshold (Bank 1)

dpfHigh
 P242F

DPF Restriction — Ash Accumulation

dpfHigh
 P244A

DPF Differential Pressure Too Low (Bank 1)

dpfHigh

General reference only — always confirm against the OEM procedure for your specific engine.