Cylinder #1 Injector - Current Below Normal (Open Circuit)
What does JD-SPN651-FMI5 mean?
The JD-SPN651-FMI5 (John Deere PowerTech) diesel fault code means: Cylinder #1 Injector - Current Below Normal (Open Circuit). This is a serious severity code.
Common Symptoms
- Rough idle / misfire on cylinder 1
- White smoke on cold start
- Loss of rated PTO power
Probable Causes (Ranked by Likelihood)
- Broken injector solenoid wire at valve-cover pass-through (common) Very Likely
- Failed injector solenoid Likely
- ECU injector driver fault Less Likely
Step-by-Step Diagnostic Procedure
Pull valve cover and inspect injector wiring harness pass-through -- chafe points are normal.
Swap injector from another cylinder and recheck if code moves with injector.
Run injector electrical test in Service ADVISOR.
Frequently Asked Questions
What is John Deere fault code SPN 651 FMI 5?
On John Deere PowerTech engines, SPN 651 FMI 5 means: Cylinder #1 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 651 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 651 FMI 5?
Repair cost range: $250-$650 injector, $60-$220 valve-cover harness. Dealer labor on large tractors runs $180-$240/hr in 2026.
SPN651-FMI5 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: