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SPN 3719 FMI 15

Aftertreatment 1 DPF Soot Load Percent — Value too high (least severe).
The reading is above normal, but only at the lowest warning level.

What the SPN covers: Estimated soot load in the diesel particulate filter as a percentage of full. More on SPN 3719.

What FMI 15 usually points to: An early warning: mild over-temperature or over-pressure, or a sensor starting to drift high. More on FMI 15.

Severity

HIGH — limit use, diagnose now

High soot load leads to derates and can damage the DPF during regen. Regenerate or service promptly.

Likely causes

  1. Lots of idling or short trips blocking regens
  2. Regens interrupted or disabled
  3. Engine making excess soot (injectors, EGR, boost leaks)
  4. Faulty DPF pressure or temperature sensors

Checks & fixes (easiest first)

  1. Perform a parked/forced regen per OEM instructions
  2. Fix any upstream engine faults first
  3. Verify the DPF pressure sensor and lines
  4. Have the DPF cleaned if regens no longer help

FAQ

What does SPN 3719 FMI 15 mean?

Aftertreatment 1 DPF Soot Load Percent — value too high (least severe). The reading is above normal, but only at the lowest warning level.

Is SPN 3719 FMI 15 serious?

High soot load leads to derates and can damage the DPF during regen. Regenerate or service promptly.

What should I check first for SPN 3719 FMI 15?

Perform a parked/forced regen per OEM instructions; Fix any upstream engine faults first; Verify the DPF pressure sensor and lines.