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SPN 412 FMI 15

EGR Temperature — Value too high (least severe).
The reading is above normal, but only at the lowest warning level.

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

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

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 15 mean?

EGR Temperature — value too high (least severe). The reading is above normal, but only at the lowest warning level.

Is SPN 412 FMI 15 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 15?

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