Barometric Pressure Sensor - Data Erratic, Intermittent, or Incorrect
The JD-SPN108-FMI2 (John Deere PowerTech) diesel fault code means: Barometric Pressure Sensor - Data Erratic, Intermittent, or Incorrect. This is a serious severity code.
- Keep driving?
- Yes, with caution
- DIY difficulty
- intermediate
- Estimated cost
- $90-$320 sensor + install
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What Are the Symptoms of JD-SPN108-FMI2?
- Fault lamp on operator display
- Possible derate once confirmed active
- Inaccurate dashboard readout for the affected parameter
What Causes JD-SPN108-FMI2? (Most Likely First)
- Failed sensor element or contaminated sensor tip Likely
- Broken, chafed, or corroded sensor harness connector Very Likely
- Open / short to ground between sensor and ECU Possible
- ECU signal input fault (rare) Less Likely
Can I Still Drive with JD-SPN108-FMI2?
Yes, with caution. JD-SPN108-FMI2 is rated serious 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 108 FMI 2?
On John Deere PowerTech engines, SPN 108 FMI 2 means: Barometric Pressure Sensor - Data Erratic, Intermittent, or Incorrect. Serious code -- address promptly to avoid inducement / further damage.
Can I keep using my John Deere tractor with SPN 108 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 108 FMI 2?
Repair cost range: $90-$320 sensor + install. Dealer labor on large tractors runs $180-$240/hr in 2026.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose JD-SPN108-FMI2?
Use John Deere Service ADVISOR (CF3/EDL v3) and capture live sensor value vs. expected range.
Back-probe the sensor harness -- verify 5V reference and signal return at the ECU connector.
Swap the sensor with a known-good matching part number and clear the code.
Check CAN data trace for sensor broadcast on J1939 before condemning the ECU.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- Deutz TCD 2.2 L3 Engine Fault Codes table, printed in the Genie SX-135 XC Service and Repair Manual, Part No. 1263383GT, April 2023printed page 158: SPN 108 FMI 2 (DTC 1083), "Ambient air pressure sensor error by component self diagnosis". The table is that engine maker's; it establishes what the J1939 SPN-FMI pair means, not that a John Deere display shows it.
Which Vehicles Commonly Get JD-SPN108-FMI2?
- 2015+ John Deere 7R Series (7210R, 7250R, 7290R, 7310R)
- 2015+ John Deere 8R / 8RT Series (8245R-8370R)
- 2015+ John Deere 9R / 9RT / 9RX Series (9370R-9620R)
- John Deere S670 / S680 / S690 combines
- John Deere S770 / S780 / S790 combines
- John Deere 544 / 624 / 724 wheel loaders
- John Deere R4045 / R4060 self-propelled sprayers
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