John Deere Engines SPN3511FMI3 Fault Code: Sensor Supply #3 Voltage Out of Range High
Also called Engine Shutdown Commanded by Application
Sensor Supply #3 Voltage Out of Range High · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
SPN 3511 FMI 3 sets when the ECU sees the Sensor Supply #3 circuit above 5.26 volts while the ignition is on. This 5-volt supply feeds sensors such as the air throttle actuator, engine oil pressure sensor, low-pressure fuel pressure sensor, EGR valve position sensor, and EGR flow sensor, depending on the engine configuration. It is logged as a Warning, and the ECU tries to maintain proper operating conditions while the fault is active.
Medium severity. John Deere lists this as a Warning-level alarm, not a shutdown. The ECU keeps trying to maintain proper operating conditions, but because Sensor Supply #3 feeds multiple engine sensors (oil pressure, fuel pressure, air throttle, or EGR position depending on configuration), a persistent high-voltage supply fault can degrade readings those systems depend on. Diagnose it before it causes a secondary fault or performance issue.
What does John Deere Engines error code SPN3511FMI3 mean?
SPN 3511 FMI 3 means the ECU has measured the voltage on its internal Sensor Supply #3 circuit and found it reading above 5.26 volts, higher than the 5-volt reference it is supposed to supply.
This supply circuit is shared by several sensors depending on engine and configuration: the air throttle actuator, engine oil pressure sensor, and low-pressure fuel pressure sensor on some configurations, or the EGR valve position sensor, air throttle actuator position sensor, and EGR flow sensor on PVX and similar configurations.
Because multiple sensors share one supply circuit, a high-voltage condition on that circuit can affect the accuracy or operation of every sensor riding on it, not just one. The ECU's response is to try to maintain proper operating conditions, but the underlying voltage problem still needs to be found and fixed.
What triggers a John Deere Engines SPN3511FMI3 code?
The ECU sets this code when the ignition is on and it detects a voltage greater than 5.26 volts on the Sensor Supply #3 circuit. The fault is active for as long as this condition is present.
Common causes of SPN3511FMI3
- Shorted air throttle actuator, engine oil pressure sensor, or low-pressure fuel pressure sensor (on configurations using these sensors)
- Shorted EGR valve position sensor, air throttle actuator position sensor, or EGR flow sensor (on PVX and similar configurations)
- A short in the wiring harness, including a short to the supply wire or a short to voltage on a signal wire
- A mispinned connector in the harness
- Bad, corroded, or loose terminals or connector pins at the ECU
- Bad, corroded, or loose terminals or connector pins at the affected sensor(s)
- Outdated or bad ECU software
- A bad ECU
How to troubleshoot John Deere Engines SPN3511FMI3: first checks
- Confirm the DTC is currently active by checking with the ignition on, since this code is only displayed while the high-voltage condition is present.
- Identify which sensors are wired to Sensor Supply #3 on this specific engine configuration (air throttle actuator, engine oil pressure sensor, and low-pressure fuel pressure sensor on some builds, or EGR valve position sensor, air throttle actuator position sensor, and EGR flow sensor on others), since the wiring differs by configuration.
- Inspect the connectors and terminals at each sensor on that supply circuit for corrosion, looseness, bent pins, or moisture intrusion.
- Inspect the ECU connector and terminals for the same issues, corrosion, looseness, or damage.
- Check the wiring harness between the ECU and each sensor for chafed insulation, pinched wires, or a short to another voltage source, and check for any mispinned connector.
- With the ignition on, measure the voltage on the Sensor Supply #3 circuit and confirm whether it reads above 5.26 volts.
- Check for outdated ECU software and update it if a newer calibration is available, since this is listed as a possible cause across configurations.
How the code clears
No separate clearing step is listed beyond correcting the underlying cause. Once the shorted sensor, damaged harness wiring, faulty terminals, or ECU software or hardware issue is repaired so the Sensor Supply #3 circuit reads within specification, the condition that sets the fault goes away. Cycle the ignition and confirm the code does not become active again before returning the machine to service.
Frequently asked questions
What does SPN 3511 FMI 3 mean on a John Deere engine?
It means the ECU detected the Sensor Supply #3 voltage circuit reading above 5.26 volts while the ignition was on. This 5-volt supply feeds sensors like the air throttle actuator, oil pressure sensor, fuel pressure sensor, or EGR-related sensors depending on the engine configuration.
Is SPN 3511 FMI 3 a serious fault?
John Deere classifies it as a Warning, not a shutdown code. The ECU keeps trying to maintain proper operating conditions. It should still be diagnosed promptly because the affected supply circuit feeds sensors tied to engine oil pressure, fuel pressure, or air and EGR control.
Which sensors are affected by this code?
Depending on the engine configuration, Sensor Supply #3 feeds the air throttle actuator, engine oil pressure sensor, and low-pressure fuel pressure sensor, or on other configurations it feeds the EGR valve position sensor, air throttle actuator position sensor, and EGR flow sensor.
What causes the Sensor Supply #3 voltage to read too high?
Listed causes include a shorted sensor on that circuit, a short in the wiring harness including a short to the supply wire or a short to voltage on a signal wire, a mispinned connector, bad terminals or connectors at the ECU or at the sensor, outdated ECU software, or a bad ECU.
Will updating the ECU software fix SPN 3511 FMI 3?
Outdated or bad ECU software is listed as one possible cause, so checking for and installing an available software update is a reasonable step, but it should be done alongside checking the wiring and connectors since several other causes are also listed.
Can I keep operating the machine with this code active?
Since it is a Warning-level code and the ECU attempts to maintain proper operating conditions, the engine may keep running, but because the affected sensors relate to oil pressure, fuel pressure, or air and EGR control, it is best to get the circuit diagnosed and repaired rather than running on it indefinitely.
Does this code always point to the same sensor or wire?
No. Which sensor is involved depends on the engine's configuration, air throttle actuator, oil pressure sensor, and fuel pressure sensor on some engines, or EGR valve position sensor, air throttle actuator position sensor, and EGR flow sensor on others (PVX and similar builds), so the wiring diagram for that specific engine should be checked.