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SPN 3719 FMI 16

Aftertreatment 1 DPF Soot Load Percent — Value too high (moderately severe).
The reading is above normal at a middle warning level — more serious than FMI 15, less than FMI 0.

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

What FMI 16 usually points to: A developing over-condition that often precedes a derate. More on FMI 16.

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 16 mean?

Aftertreatment 1 DPF Soot Load Percent — value too high (moderately severe). The reading is above normal at a middle warning level — more serious than FMI 15, less than FMI 0.

Is SPN 3719 FMI 16 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 16?

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