John Deere Engines SPN100FMI3 Fault Code: Engine Oil Pressure Input Voltage High
Also called Engine Oil Pressure Signal Out of Range High
Engine Oil Pressure Input Voltage High · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
SPN 100 FMI 3 (also shown as DTC 000100.03) means the engine oil pressure sensor's input voltage has climbed above the circuit's high voltage specification, a level that corresponds to an oil pressure higher than is physically possible. When it sets, the ECU falls back to a default oil pressure value and disables its low oil pressure engine protection feature, so the engine keeps running without that safety net.
High severity. The engine will keep running, but the ECU disables its low oil pressure protection feature once this code sets. That means a real low oil pressure event could go undetected and cause engine damage before anyone notices. Treat this as a stop-soon and diagnose issue, not something to ignore for the rest of the shift.
What does John Deere Engines error code SPN100FMI3 mean?
>Oil pressure sensor is a pressure transducer plumbed into the main oil gallery or, on some engines, the oil cooler. As actual oil pressure rises, the sensor's output voltage rises with it. The ECU reads that voltage continuously so it can shut down or protect the engine if oil pressure drops too low.
SPN 100 FMI 3 fires when the input voltage seen by the ECU is higher than the sensor's high voltage specification allows, a voltage that would only make sense if oil pressure were higher than the engine could ever physically produce. That tells the ECU the signal itself is bad, not that oil pressure is actually excessive.
Once the code sets, the ECU substitutes a default oil pressure value (reported as 500 kPa (5.0 bar) (72.5 psi) on some applications and 260 kPa (2.6 bar) (37.5 psi) or 260 kPa (2.6 bar) (37.7 psi) on others) and turns off its low oil pressure engine protection logic. Some versions also report a blinking warning light. On some machines an oil pressure switch is used instead of a sensor, and this diagnostic only applies to systems using the sensor.
What triggers a John Deere Engines SPN100FMI3 code?
The code sets when the oil pressure input voltage exceeds the sensor's high voltage specification. For OEM applications this threshold is given as 4.9 volts in one version and 4.5 volts in another, depending on the application; other applications should check the application specifications section for the exact threshold. If a Sensor Supply Voltage High DTC is also present, that fault should be diagnosed first since it can cause this one.
Common causes of SPN100FMI3
- Bad or corroded terminals or connector at the oil pressure sensor
- Bad or corroded terminals or pins at the ECU connector (including the ECU 30-way or 60-way connector depending on application)
- Open or shorted wiring harness between the sensor and ECU, including a short to a voltage source in the oil pressure input circuit or an open in the oil pressure ground circuit
- Faulty oil pressure sensor
- Faulty ECU
How to troubleshoot John Deere Engines SPN100FMI3: first checks
- Without disconnecting anything, visually inspect the ECU connector(s) and the oil pressure sensor connector for contamination, corrosion, damage, or terminals that are not fully seated
- Perform a preliminary inspection of the connectors in between the sensor and the ECU, looking for dirty, damaged, or poorly positioned terminals
- Inspect the wiring harness for chafing, pinches, or damage that could cause a short to a voltage source or an open ground
- When probing connectors for voltage checks, use a proper connector adapter test kit rather than forcing probes into the terminals, since forcing probes can damage the terminals and create a new fault
- Confirm whether the machine uses an oil pressure sensor or an oil pressure switch, since this diagnostic only applies to sensor-equipped systems
How the code clears
No separate clearing step is listed. Once the underlying wiring, connector, sensor, or ECU problem is repaired and the input voltage returns to a normal operating range, the code should stop being active. Confirm with a scan tool that the fault is no longer active and that low oil pressure engine protection is functioning again before returning the machine to normal service.
Frequently asked questions
Can I keep operating the machine with SPN 100 FMI 3 active?
The engine will typically keep running, but the ECU has disabled its low oil pressure engine protection feature and is using a default oil pressure value instead of the real reading. This means a genuine low oil pressure event could go undetected. It is best to get this diagnosed and repaired promptly rather than running it indefinitely.
What does 'oil pressure input voltage high' actually mean?
It means the voltage signal the ECU is receiving from the oil pressure sensor circuit is higher than the sensor's high voltage specification allows, corresponding to a pressure that is higher than the engine could physically produce. It is a signal problem, not a sign that oil pressure is genuinely too high.
What is DTC 000100.03 and is it different from SPN 100 FMI 3?
DTC 000100.03 is the same fault described in a different code format. Both refer to the engine oil pressure input voltage being above the sensor's high voltage specification.
Does this code disable any safety features?
Yes. Once SPN 100 FMI 3 sets, the ECU's low oil pressure engine protection feature is disabled, and the ECU substitutes a fixed default oil pressure value in place of the real sensor reading.
What should be checked first when this code appears?
Start with a visual inspection of the ECU and oil pressure sensor connectors for contamination, damage, or poor positioning, and check the wiring harness between them for damage. If a Sensor Supply Voltage High code is also present, diagnose that one first.
Is the oil pressure sensor always to blame?
Not necessarily. Possible causes include bad terminals or connectors at the sensor or ECU, an open or shorted harness, a faulty oil pressure sensor itself, or a faulty ECU. Wiring and connector problems are common causes alongside a bad sensor.
What voltage triggers this fault?
For OEM applications the high voltage specification is given as 4.9 volts in some manuals and 4.5 volts in others. Other applications should reference their specific application specifications for the exact threshold used.