JD-SPN651-FMI5 serious John Deere PowerTech ›

Cylinder #1 Injector - Current Below Normal (Open Circuit)

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.

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Keep driving?
Yes, with caution
DIY difficulty
intermediate
Estimated cost
$250-$650 injector, $60-$220 valve-cover harness
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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

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.

Mechanics Guide Step-by-step diagnosis

Step-by-Step Diagnostic Procedure

  1. Pull valve cover and inspect injector wiring harness pass-through -- chafe points are normal.

  2. Swap injector from another cylinder and recheck if code moves with injector.

  3. Run injector electrical test in Service ADVISOR.

Sources 1

This page is built from documented references. Verify against your own service info before repair work.

  • SAE J1939-73Application Layer: Diagnostics (defines the SPN/FMI fault-identifier framework)

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:

Volvo / Mack serious Injector Cylinder 1 Circuit Open (J1939)

Commonly Affected Vehicles

  • 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

Explore More

More John Deere PowerTech codes → Diesel home All diesel codes Heavy-duty Guides

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