DEF Dosing Injector - Current Below Normal
The JD-SPN3361-FMI5 (John Deere PowerTech) diesel fault code means: DEF Dosing Injector - Current Below Normal. This is a serious severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- intermediate
- Estimated cost
- $450-$900 doser + hardware
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Common Symptoms
- Amber DEF warning -> inducement countdown if not repaired
- Low NOx conversion efficiency at SCR outlet
Probable Causes (Ranked by Likelihood)
- DEF doser injector crystallized / stuck Very Likely
- Open / broken doser wiring Likely
- Failed DEF dosing control unit Less Likely
Step-by-Step Diagnostic Procedure
Command doser test via Service ADVISOR; listen for audible click and spray.
Replace doser if open or leaking; flush lines of crystallized urea.
Frequently Asked Questions
What is John Deere fault code SPN 3361 FMI 5?
On John Deere PowerTech engines, SPN 3361 FMI 5 means: DEF Dosing Injector - Current Below Normal. Serious code -- address promptly to avoid inducement / further damage.
Can I keep using my John Deere tractor with SPN 3361 FMI 5?
Serious fault -- you can move the machine to a shop but don't run it under load. Diagnose with John Deere Service ADVISOR via an EDL v3 / CF3 interface.
How much does it cost to fix John Deere SPN 3361 FMI 5?
Repair cost range: $450-$900 doser + hardware. Dealer labor on large tractors runs $180-$240/hr in 2026.
Sources
This page is built from documented references. Verify against your own service info before repair work.
SPN3361-FMI5 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: