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SPN 412 FMI 0

EGR Temperature — Value too high (most severe).
The reading is valid but far above the normal operating range — high enough that the controller treats it as the most serious level of 'too high'.

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

What FMI 0 usually points to: A real over-condition (over-temperature, over-pressure, overspeed) or a sensor reporting a believable but wrong high value. More on FMI 0.

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 0 mean?

EGR Temperature — value too high (most severe). The reading is valid but far above the normal operating range — high enough that the controller treats it as the most serious level of 'too high'.

Is SPN 412 FMI 0 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 0?

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