John Deere Engines SPN1109FMI14 Fault Code: Engine Shutdown

What does John Deere Engines error code SPN1109FMI14 mean?

SPN 1109 FMI 14 is John Deere's code for an engine shutdown event triggered by one of three underlying conditions: oil pressure dropping below the shutdown set point programmed in the ECU, coolant temperature reaching 115°C (239°F), or the loss of coolant temperature switch closing to ground on the external shutdown/derate input terminal.

This code is really a symptom, not a root cause. It tells the operator that the ECU's engine protection logic has been triggered by a physical condition in the oil or cooling system. The code always appears alongside another, more specific fault code that identifies exactly which condition caused it.

What actually happens to the engine depends on how the ECU is configured. If it's set up for engine protection with shutdown, the engine will be shut down automatically. If it's set up for engine protection without shutdown, the engine will derate power instead of stopping. If no engine protection is configured, the ECU will not shut the engine down or derate it at all, though the underlying oil or coolant problem still exists and still needs attention.

Common causes of SPN1109FMI14

• Low oil pressure: the ECU senses oil pressure has dropped below the shutdown value set point programmed into the ECU, which will also set DTC 000100.18.
• High engine coolant temperature: the ECU senses coolant temperature at 115°C (239°F), which will also set DTC 000110.00. Note that this temperature value applies to OEM engine applications; other machine applications may use the same or a different threshold, so check the machine manual for the actual high coolant temperature value used.
• Loss of coolant level: the coolant temperature switch contacts close, causing the ECU to sense continuity to ground through the external shutdown/derate input terminal, which will also set DTC 000111.01.
• Other stored or active fault codes: because SPN 1109 FMI 14 is triggered by another underlying condition, additional codes are always expected to be present alongside it and point to the real root cause.

How to troubleshoot John Deere Engines SPN1109FMI14: first checks

1. 1Check for other stored or active fault codes at the same time as SPN 1109 FMI 14. These are the key to finding the real cause, since this code is a downstream effect of another problem, look specifically for DTC 000100.18 (low oil pressure), DTC 000110.00 (high coolant temperature), or DTC 000111.01 (loss of coolant level switch).
2. 2Check engine oil level and oil condition. Low oil, diluted oil, or a failing oil pump can all cause the oil pressure to drop below the shutdown set point.
3. 3Check coolant level and condition in the radiator and overflow/recovery tank. A low coolant level can cause the loss of coolant level switch to trip even if actual temperature readings look normal.
4. 4Inspect the cooling system for restrictions, a failed thermostat, a failing water pump, a plugged radiator, or a slipping/failed fan drive, any of which can drive coolant temperature up to the shutdown threshold.
5. 5Inspect wiring and connectors at the external shutdown/derate input terminal and the coolant temperature switch for corrosion, damage, or a short to ground that could falsely trigger the loss of coolant level shutdown path.
6. 6Confirm how the ECU is programmed for engine protection (with shutdown, without shutdown, or none) so you understand what behavior to expect from the machine when this code is active.

How the code clears

No separate clearing procedure is listed for this code. Because SPN 1109 FMI 14 is triggered by another active condition (low oil pressure, high coolant temperature, or a loss of coolant level switch signal), it should clear on its own once the underlying cause is found and corrected. Always diagnose and resolve the accompanying fault code (DTC 000100.18, 000110.00, or 000111.01) rather than trying to clear this code directly.