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SPN 412 FMI 16

EGR Temperature — 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: Temperature of recirculated exhaust gas after the EGR cooler. More on SPN 412.

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

Severity

MEDIUM — fix soon

High EGR temperature often means the EGR cooler is not cooling. Address soon to avoid further damage.

Likely causes

  1. Plugged or failing EGR cooler
  2. Low coolant flow through the EGR cooler
  3. EGR valve stuck open
  4. Sensor or wiring fault

Checks & fixes (easiest first)

  1. Check coolant level and look for coolant loss
  2. Inspect EGR cooler for plugging or leaks
  3. Check EGR valve operation
  4. Compare sensor reading after cold soak

FAQ

What does SPN 412 FMI 16 mean?

EGR Temperature — 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 412 FMI 16 serious?

High EGR temperature often means the EGR cooler is not cooling. Address soon to avoid further damage.

What should I check first for SPN 412 FMI 16?

Check coolant level and look for coolant loss; Inspect EGR cooler for plugging or leaks; Check EGR valve operation.