Cylinder #5 Injector - Current Below Normal (Open Circuit)
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.
- Keep driving?
- Yes, with caution
- DIY difficulty
- intermediate
- Estimated cost
- $250-$800 injector
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What Are the Symptoms of JD-SPN655-FMI5?
- Cyl 5 misfire (6-cyl engines: 6.8L, 9.0L, 13.5L)
- Rough idle, loss of pull
What Causes JD-SPN655-FMI5? (Most Likely First)
- Harness break / chafed wire Very Likely
- Failed injector Likely
Can I Still Drive with JD-SPN655-FMI5?
Yes, with caution. JD-SPN655-FMI5 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
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.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose JD-SPN655-FMI5?
Service ADVISOR cylinder balance test; verify by swapping injectors.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- John Deere Operator's Manual, PowerTech 4.5 L and 6.8 L Tier 2 OEM Diesel Engines, OMRG33324 (Issue 16Feb04), reproduced as a supplement in Genie's telehandler parts library (doc 237949), "Listing of Diagnostic Trouble Codes"printed page 45-29: SPN 655 FMI 05, "Cylinder #5 EI Circuit Open". This is John Deere's own table for PowerTech 4.5 L and 6.8 L Tier 2 engines; later PowerTech engines were not checked against it.
- SAE J1939-73Application Layer: Diagnostics (defines the SPN/FMI fault-identifier framework)
Which Vehicles Commonly Get JD-SPN655-FMI5?
- 2014+ John Deere 6R Series tractors
- 2015+ John Deere 7R Series tractors
- 2015+ John Deere 8R / 8RT Series tractors
- 2015+ John Deere 9R / 9RT / 9RX Series tractors
- 2015+ John Deere S670 / S680 / S690 combines
- John Deere S770 / S780 / S790 combines
- John Deere 544/644/724 wheel loaders (construction)
- John Deere 310/410 backhoes
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