Aftertreatment Intake System Status - Root Cause Not Known
The JD-SPN3482-FMI11 (John Deere PowerTech) diesel fault code means: Aftertreatment Intake System Status - Root Cause Not Known. This is a moderate 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
- intermediate
- Estimated cost
- $150-$420 MAF / CAC sensor, $280-$900 charge air piping
What Are the Symptoms of JD-SPN3482-FMI11?
- Loss of power on acceleration
- Boost or intake pressure reading outside expected map
- Possible derate with CAC fault
What Causes JD-SPN3482-FMI11? (Most Likely First)
- Cracked charge-air cooler (CAC) tank or clamp loose Likely
- Intake throttle valve actuator binding with soot Likely
- MAF / MAP sensor contamination Possible
- Air filter restriction -- clogged filter at long service intervals Possible
Can I Still Drive with JD-SPN3482-FMI11?
Reduced power (derate). JD-SPN3482-FMI11 is rated moderate 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 3482 FMI 11?
On John Deere PowerTech engines, SPN 3482 FMI 11 means: Aftertreatment Intake System Status - Root Cause Not Known. Moderate code -- diagnose soon; continued operation may increase repair scope.
Can I keep using my John Deere tractor with SPN 3482 FMI 11?
Moderate fault -- you can usually keep working but expect derate if aftertreatment-related. Diagnose with John Deere Service ADVISOR via an EDL v3 / CF3 interface.
How much does it cost to fix John Deere SPN 3482 FMI 11?
Repair cost range: $150-$420 MAF / CAC sensor, $280-$900 charge air piping. Dealer labor on large tractors runs $180-$240/hr in 2026.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose JD-SPN3482-FMI11?
Smoke-test the intake tract to find leaks at boots and clamps.
Measure restriction at the air cleaner -- compare against CTM spec.
Clean the intake throttle valve and recheck sweep via Service ADVISOR.
Swap MAP / MAF sensor and re-scan for code recurrence.
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-SPN3482-FMI11?
- 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
Explore More
Was this helpful?
Send this to whoever is fixing the truck — your tech, or the person asking what the fault means.