Aftertreatment Intake Pressure Differential - Data Valid but Above Normal Operational Range (Most Severe)
The JD-SPN3490-FMI0 (John Deere PowerTech) diesel fault code means: Aftertreatment Intake Pressure Differential - Data Valid but Above Normal Operational Range (Most Severe). This is a serious severity code.
- Keep driving?
- Yes, with caution
- 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
Frequently Asked Questions
What is John Deere fault code SPN 3490 FMI 0?
On John Deere PowerTech engines, SPN 3490 FMI 0 means: Aftertreatment Intake Pressure Differential - Data Valid but Above Normal Operational Range (Most Severe). Serious code -- address promptly to avoid inducement / further damage.
Can I keep using my John Deere tractor with SPN 3490 FMI 0?
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 3490 FMI 0?
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
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.
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)
Commonly Affected Vehicles
- 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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