Cylinder #5 Injector - Current Below Normal (Open Circuit)
Can I Drive?
Yes, But Fix Soon
DIY Difficulty
intermediate
Estimated Cost
$250-$800 injector
What does JD-SPN655-FMI5 mean?
The JD-SPN655-FMI5 (John Deere PowerTech) diesel fault code means: Cylinder #5 Injector - Current Below Normal (Open Circuit). This is a serious severity code.
Common Symptoms
- Cyl 5 misfire (6-cyl engines: 6.8L, 9.0L, 13.5L)
- Rough idle, loss of pull
Probable Causes (Ranked by Likelihood)
- Harness break / chafed wire Very Likely
- Failed injector Likely
Step-by-Step Diagnostic Procedure
Service ADVISOR cylinder balance test; verify by swapping injectors.
Frequently Asked Questions
What is John Deere fault code SPN 655 FMI 5?
On John Deere PowerTech engines, SPN 655 FMI 5 means: Cylinder #5 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 655 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 655 FMI 5?
Repair cost range: $250-$800 injector. Dealer labor on large tractors runs $180-$240/hr in 2026.