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SPN 5246 FMI 16 — SCR NOx limit — moderate derate
CautionAftertreatmentLimp to the next safe stop
Applies to: Navistar · Paccar · Sae · Volvo
SCR NOx limit — moderate derate.
Don't risk it — get a diesel tech on the truck.
Your SPN/FMI rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Caution. Limp to the next safe stop.
Most likely causes
- Parent SCR fault
- Parent SCR fault unaddressed
- Parent SCR fault unaddressed too long
First moves (roadside)
- Find parent
- Fix parent
- Clear via ServiceMaxx
- Fix parent fault
- Clear via DAVIE
- Clear inducement via Tech Tool
FAQ
What does SPN 5246 FMI 16 mean?
SCR NOx limit — moderate derate.
How serious is SPN 5246 FMI 16?
Caution — Limp to the next safe stop.
What's the most likely cause of SPN 5246 FMI 16?
The most common cause is: Parent SCR fault. Other possibilities include Parent SCR fault unaddressed; Parent SCR fault unaddressed too long.
Can I keep driving with SPN 5246 FMI 16?
Limp to the next safe stop. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Throwing this code right now?
Find a mechanic or related guides
General diagnostic guidance for heavy-duty diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack). Not a substitute for a scan-tool diagnosis on your specific truck.