Aftertreatment Intake System Status - Data Erratic, Intermittent, or Incorrect
The JD-SPN3482-FMI2 (John Deere PowerTech) diesel fault code means: Aftertreatment Intake System Status - Data Erratic, Intermittent, or Incorrect. This is a serious 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 2?
On John Deere PowerTech engines, SPN 3482 FMI 2 means: Aftertreatment Intake System Status - Data Erratic, Intermittent, or Incorrect. Serious code -- address promptly to avoid inducement / further damage.
Can I keep using my John Deere tractor with SPN 3482 FMI 2?
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 3482 FMI 2?
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.