SPN 3712 FMI 15 — SCR operator inducement — stage 1 (warning only)
Applies to: Detroit · Sae · 1st of 4 inducement stages
SCR operator inducement — stage 1 (warning only).
Your SPN/FMI rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Parent SCR fault has been active — grace period
- No derate yet
- Chasing 3712 itself
- Parent SCR fault active (NOx conversion low
- DEF quality
- Dosing issue)
First moves (roadside)
- Find the parent SCR fault (NOx conversion
- Dosing
- DEF quality)
- Fix parent before inducement escalates
- Find parent fault
- Do not chase 3712 directly
- Fix parent then clear
FAQ
SCR operator inducement — stage 1 (warning only).
Serious — Power derate likely — plan to stop soon.
The most common cause is: Parent SCR fault has been active — grace period. Other possibilities include No derate yet; Chasing 3712 itself; Parent SCR fault active (NOx conversion low; DEF quality; Dosing issue).
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
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.