Aftertreatment DPF Ash Load Percent - Data Valid but Above Normal Operational Range (Least Severe)
The JD-SPN3720-FMI15 (John Deere PowerTech) diesel fault code means: Aftertreatment DPF Ash Load Percent - Data Valid but Above Normal Operational Range (Least Severe). This is a minor severity code.
Unverified. We could not confirm this code's definition against freely available manufacturer documentation, so treat the meaning, severity and fix guidance on this page as unconfirmed. Check it against the manufacturer's service information for your exact model and serial range before acting on it. This page is kept out of search engines for that reason, and we are working through this family manual by manual.
- Keep driving?
- Reduced power (derate)
- DIY difficulty
- advanced
- Estimated cost
- $450-$1,200 differential pressure sensor, $1,800-$4,500 DPF clean / replace
What Are the Symptoms of JD-SPN3720-FMI15?
- Frequent passive regen never completes (short-duty tractors)
- DPF lamp + derate on soot load > 100%
- Parked regen request every few hours
What Causes JD-SPN3720-FMI15? (Most Likely First)
- Short-duty-cycle use stopping passive regen from occurring Very Likely
- Differential pressure sensor hose plugged / cracked Likely
- Ash loaded beyond service interval (5,000+ hrs) Likely
- DPF substrate cracked from over-temp regen Possible
Can I Still Drive with JD-SPN3720-FMI15?
Reduced power (derate). JD-SPN3720-FMI15 is rated minor 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 3720 FMI 15?
On John Deere PowerTech engines, SPN 3720 FMI 15 means: Aftertreatment DPF Ash Load Percent - Data Valid but Above Normal Operational Range (Least Severe). Minor code -- monitor; does not affect safe operation.
Can I keep using my John Deere tractor with SPN 3720 FMI 15?
Minor fault -- finish the job, then service at the next opportunity. Diagnose with John Deere Service ADVISOR via an EDL v3 / CF3 interface.
How much does it cost to fix John Deere SPN 3720 FMI 15?
Repair cost range: $450-$1,200 differential pressure sensor, $1,800-$4,500 DPF clean / replace. Dealer labor on large tractors runs $180-$240/hr in 2026.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose JD-SPN3720-FMI15?
Record DPF ΔP and soot load in Service ADVISOR at rated load.
Command parked regen and monitor DPF inlet temperature ramp.
Clean DPF differential pressure sensor hoses (common on compact tractors).
If ash load > 95%, remove and send out for ash cleaning.
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)
Which Vehicles Commonly Get JD-SPN3720-FMI15?
- 2015+ John Deere 7R Series (7210R, 7250R, 7290R, 7310R)
- 2015+ John Deere 8R / 8RT Series (8245R-8370R)
- John Deere S670 / S680 / S690 combines
- John Deere S770 / S780 / S790 combines
- 2021+ John Deere X9 1000 combine
- John Deere 1025R sub-compact utility tractor
- John Deere 2025R / 2038R / 2032R compact utility tractors
- John Deere R4045 / R4060 self-propelled sprayers
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