Cylinder #6 Injector - Current Below Normal (Open Circuit)
What does JD-SPN656-FMI5 mean?
The JD-SPN656-FMI5 (John Deere PowerTech) diesel fault code means: Cylinder #6 Injector - Current Below Normal (Open Circuit). This is a serious severity code.
Common Symptoms
- Cyl 6 misfire on 6-cylinder PowerTech (8R, 9R, combines)
- Loss of power
Probable Causes (Ranked by Likelihood)
- Valve-cover pass-through wire break Very Likely
- Failed injector Likely
Step-by-Step Diagnostic Procedure
Harness inspection + Service ADVISOR injector test.
Frequently Asked Questions
What is John Deere fault code SPN 656 FMI 5?
On John Deere PowerTech engines, SPN 656 FMI 5 means: Cylinder #6 Injector - Current Below Normal (Open Circuit). Serious code -- address promptly to avoid inducement / further damage.
Can I keep using my John Deere tractor with SPN 656 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 656 FMI 5?
Repair cost range: $250-$800 injector. Dealer labor on large tractors runs $180-$240/hr in 2026.
SPN656-FMI5 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: