Intake Manifold / Boost Pressure Sensor - Voltage Above Normal
The JD-SPN102-FMI3 (John Deere PowerTech) diesel fault code means: Intake Manifold / Boost Pressure Sensor - Voltage Above Normal. This is a moderate severity code.
- Keep driving?
- Yes, with caution
- DIY difficulty
- beginner
- Estimated cost
- $120-$260 sensor, $80-$300 harness repair
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Common Symptoms
- Reduced power / derate at high PTO load
- Black smoke at rated load
- MAP sensor fault active on dash
Probable Causes (Ranked by Likelihood)
- MAP/boost sensor harness open or shorted to power Very Likely
- Failed boost pressure sensor Likely
- Corrosion in connector from pressure-wash intrusion Likely
Frequently Asked Questions
What is John Deere fault code SPN 102 FMI 3?
On John Deere PowerTech engines, SPN 102 FMI 3 means: Intake Manifold / Boost Pressure Sensor - Voltage Above Normal. Moderate code. Keep working cautiously and plan repair.
Can I keep using my John Deere tractor with SPN 102 FMI 3?
Moderate fault -- continue light use, fix at next service. Diagnose with John Deere Service ADVISOR via an EDL v3 / CF3 interface.
How much does it cost to fix John Deere SPN 102 FMI 3?
Repair cost range: $120-$260 sensor, $80-$300 harness repair. Dealer labor on large tractors runs $180-$240/hr in 2026.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
Ohm the sensor signal line back to the ECU -- should read < 5 ohms.
Check for 5V reference at sensor connector with key on.
Swap with known-good sensor from parts tractor to confirm.
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
- 2014+ John Deere 6R Series tractors
- 2015+ John Deere 7R Series tractors
- 2015+ John Deere 8R / 8RT Series tractors
- 2015+ John Deere 9R / 9RT / 9RX Series tractors
- 2015+ John Deere S670 / S680 / S690 combines
- John Deere S770 / S780 / S790 combines
- John Deere 544/644/724 wheel loaders (construction)
- John Deere 310/410 backhoes
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