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SPN 412 FMI 2

EGR Temperature — Data erratic, intermittent, or incorrect.
The signal jumps around, drops in and out, or disagrees with other information the controller has.

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

What FMI 2 usually points to: Loose or corroded connectors, chafed wiring, a failing sensor, or two redundant sensors that do not agree. More on FMI 2.

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 2 mean?

EGR Temperature — data erratic, intermittent, or incorrect. The signal jumps around, drops in and out, or disagrees with other information the controller has.

Is SPN 412 FMI 2 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 2?

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