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.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- intermediate
- Estimated cost
- $150-$420 MAF / CAC sensor, $280-$900 charge air piping
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Common Symptoms
- Loss of power on acceleration
- Boost or intake pressure reading outside expected map
- Possible derate with CAC fault
Probable Causes (Ranked by Likelihood)
- 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
Step-by-Step Diagnostic Procedure
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.
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.
Sources
This page is built from documented references. Verify against your own service info before repair work.