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P2459

DPF Regeneration Frequency

Medium
OBD-II dpf
What it means

Regens happening too often — short-trip duty cycle, leaks, or injector/EGR faults raising soot.

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Related codes
SPN 3246 / FMI 0

DPF Outlet Gas Temperature — Above Normal (Most Severe)

dpfHigh
 SPN 3251 / FMI 0

DPF Differential Pressure — 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

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