Cylinder #2 Injector - Current Below Normal (Open Circuit)
Can I Drive?
Yes, But Fix Soon
DIY Difficulty
intermediate
Estimated Cost
$250-$650 injector, $60-$220 harness
What does JD-SPN652-FMI5 mean?
The JD-SPN652-FMI5 (John Deere PowerTech) diesel fault code means: Cylinder #2 Injector - Current Below Normal (Open Circuit). This is a serious severity code.
Common Symptoms
- Rough idle / misfire on cylinder 2
- Smoke on cold start
- Loss of power
Probable Causes (Ranked by Likelihood)
- Broken solenoid wire in valve-cover pass-through Very Likely
- Failed injector solenoid Likely
- ECU driver fault Less Likely
Step-by-Step Diagnostic Procedure
Swap-test injector with cyl 1.
Check harness continuity ECU->injector.
Frequently Asked Questions
What is John Deere fault code SPN 652 FMI 5?
On John Deere PowerTech engines, SPN 652 FMI 5 means: Cylinder #2 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 652 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 652 FMI 5?
Repair cost range: $250-$650 injector, $60-$220 harness. Dealer labor on large tractors runs $180-$240/hr in 2026.