SPN 412 — EGR Temperature
System: EGR
Temperature of recirculated exhaust gas after the EGR cooler.
Can I keep running it?
MEDIUM — fix soon
High EGR temperature often means the EGR cooler is not cooling. Address soon to avoid further damage.
Likely causes
- Plugged or failing EGR cooler
- Low coolant flow through the EGR cooler
- EGR valve stuck open
- Sensor or wiring fault
Checks & fixes (easiest first)
- Check coolant level and look for coolant loss
- Inspect EGR cooler for plugging or leaks
- Check EGR valve operation
- Compare sensor reading after cold soak
Common FMIs with SPN 412
- SPN 412 FMI 0Value too high (most severe)
- SPN 412 FMI 2Data erratic, intermittent, or incorrect
- SPN 412 FMI 3Voltage above normal or shorted high
- SPN 412 FMI 4Voltage below normal or shorted low
- SPN 412 FMI 15Value too high (least severe)
- SPN 412 FMI 16Value too high (moderately severe)
Related codes
FAQ
What does SPN 412 mean?
SPN 412 is EGR Temperature. Temperature of recirculated exhaust gas after the EGR cooler.
Can I keep running with SPN 412?
High EGR temperature often means the EGR cooler is not cooling. Address soon to avoid further damage.
What causes SPN 412?
Plugged or failing EGR cooler; Low coolant flow through the EGR cooler; EGR valve stuck open; Sensor or wiring fault.