Engine Oil Pressure Sensor Circuit - Voltage Below Normal
The JD-SPN100-FMI4 (John Deere PowerTech) diesel fault code means: Engine Oil Pressure Sensor Circuit - Voltage Below Normal. This is a moderate severity code.
- Keep driving?
- Yes, with caution
- DIY difficulty
- intermediate
- Estimated cost
- $180-$450 sensor, harness repair $60-$220
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What Are the Symptoms of JD-SPN100-FMI4?
- False low oil pressure warning
- Check engine lamp, no derate
- Intermittent fault stored in historical tab
What Causes JD-SPN100-FMI4? (Most Likely First)
- Harness short to ground at oil pressure sensor connector Very Likely
- Failed oil pressure sensor Likely
- Corroded pin in ECU connector X1/X2 Possible
Can I Still Drive with JD-SPN100-FMI4?
Yes, with caution. JD-SPN100-FMI4 is rated moderate 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 100 FMI 4?
On John Deere PowerTech engines, SPN 100 FMI 4 means: Engine Oil Pressure Sensor Circuit - Voltage Below Normal. Moderate code. Keep working cautiously and plan repair.
Can I keep using my John Deere tractor with SPN 100 FMI 4?
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 100 FMI 4?
Repair cost range: $180-$450 sensor, harness repair $60-$220. Dealer labor on large tractors runs $180-$240/hr in 2026.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose JD-SPN100-FMI4?
Disconnect the oil pressure sensor and watch live data -- should swing to 5V / SPN 100 FMI 3 if wiring is good.
Back-probe signal pin with DMM; compare to Deere CTM specs (typically 0.5-4.5V).
Repair wiring, then use Service ADVISOR to clear and re-run.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- John Deere Operator's Manual, PowerTech 4.5 L and 6.8 L Tier 2 OEM Diesel Engines, OMRG33324 (Issue 16Feb04), reproduced as a supplement in Genie's telehandler parts library (doc 237949), "Listing of Diagnostic Trouble Codes"printed page 45-24: SPN 100 FMI 04, "Engine Oil Pressure Input Voltage Low". This is John Deere's own table for PowerTech 4.5 L and 6.8 L Tier 2 engines; later PowerTech engines were not checked against it.
- 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 100 FMI 4 (DTC 1022), "Oil pressure voltage below normal or shorted to low". The table is that engine maker's; it establishes what the J1939 SPN-FMI pair means, not that a John Deere display shows it.
SPN100-FMI4 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
Which Vehicles Commonly Get JD-SPN100-FMI4?
- 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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