John Deere Engines SPN3510FMI3 Fault Code: Sensor Supply #2 Voltage Out of Range High
Also called Engine Shutdown Commanded by Application
Sensor Supply #2 Voltage Out of Range High · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
SPN 3510 FMI 3 sets when the ECU sees the Sensor Supply #2 circuit above 5.26 volts. This 5-volt reference feeds sensors like the intake manifold air pressure sensor, engine oil pressure sensor, low pressure fuel pressure sensor, VGT vane position sensor, fuel dosing pressure sensors, or the secondary analog throttle depending on the engine configuration. Alarm level is Warning, and the ECU keeps running but engine performance may be affected.
Medium severity. This code is logged as a Warning, not a shutdown or derate command in the data given. The ECU keeps trying to operate normally, but because several pressure and throttle sensors share this 5-volt supply, engine performance may be affected until the wiring and ECU connections are checked.
What does John Deere Engines error code SPN3510FMI3 mean?
SPN 3510 FMI 3 means the engine ECU has detected voltage on its internal Sensor Supply #2 circuit that is higher than 5.26 volts, which is above the specification for that 5-volt reference supply.
This supply circuit has multiple outputs from different ECU connectors depending on engine build: J1, J2, and J3 are all referenced across different configurations. Depending on the machine, the sensors fed by this supply can include the intake manifold air pressure sensor, engine oil pressure sensor, the optional low pressure fuel pressure sensor, the VGT vane position sensor, fuel dosing inlet and outlet pressure sensors, or a secondary analog throttle.
Because these sensors depend on a clean, correct 5-volt reference to report accurate readings, an overvoltage condition on this supply can throw off multiple sensor readings at once. The ECU will attempt to keep operating normally, but it warns that engine performance may be affected while the condition is active.
What triggers a John Deere Engines SPN3510FMI3 code?
The ECU sets this code whenever the ignition is on and it detects voltage greater than 5.26 volts on the Sensor Supply #2 circuit. The code is active any time this overvoltage condition is present with the key on.
Common causes of SPN3510FMI3
- Bad ECU
- Bad ECU connector connection or bad terminals at the ECU connector
- Shorted wires in the harness
- Open or short in the harness
- Pinched or melted wires in the harness
- Bad or outdated ECU software
- Shorted VGT vane position sensor, fuel dosing inlet sensor, or fuel dosing outlet pressure sensor
- Bad terminals or connector at the VGT vane position sensor, fuel dosing inlet sensor, or fuel dosing outlet pressure sensor
How to troubleshoot John Deere Engines SPN3510FMI3: first checks
- With the key on, check for the DTC being active. It will show whenever the ignition is on and the fault condition is present.
- Inspect the ECU connectors (J1, J2, and J3 depending on engine configuration) for corrosion, bent or pushed-back pins, or a loose connection at the ECU.
- Trace the harness for the Sensor Supply #2 circuit and look for pinched, melted, chafed, or shorted wiring between the ECU and the sensors it feeds.
- Check the connectors and terminals at each sensor fed by this supply: intake manifold air pressure sensor, engine oil pressure sensor, low pressure fuel pressure sensor (if equipped), VGT vane position sensor, fuel dosing inlet/outlet pressure sensors, or secondary analog throttle, depending on your engine's configuration.
- If wiring and connectors check out, consider that ECU software may be outdated or corrupted, or the ECU itself may be faulty.
How the code clears
No separate clearing step is listed. The code is described as active whenever the ignition is on and the overvoltage condition is present, so once the underlying wiring, connector, sensor, or ECU issue is corrected, the condition should stop being detected. No reset procedure is listed for this code.
Frequently asked questions
What does SPN 3510 FMI 3 mean on a John Deere engine?
It means the ECU has detected a voltage above 5.26 volts on its internal Sensor Supply #2 circuit, which is a 5-volt reference supply used by several sensors. It is logged as a Warning.
Will SPN 3510 FMI 3 shut down my engine?
Not based on what is documented. The ECU tries to operate normally and continues running, though engine performance may be affected because sensors sharing this 5-volt supply could report inaccurate readings.
Which sensors are affected by SPN 3510 FMI 3?
Depending on the engine's specific configuration, this supply can feed the intake manifold air pressure sensor, engine oil pressure sensor, an optional low pressure fuel pressure sensor, the VGT vane position sensor, fuel dosing inlet and outlet pressure sensors, or a secondary analog throttle.
What usually causes SPN 3510 FMI 3?
Common causes include a bad ECU, bad or corroded ECU connector terminals, shorted or pinched wiring in the harness, an open or short in the harness, outdated or corrupted ECU software, or a shorted sensor on the circuit such as the VGT vane position sensor or fuel dosing pressure sensors.
Can I keep driving or working with this code active?
The alarm level is Warning and the ECU attempts to keep running normally, but because engine performance may be affected, it is best to get the wiring and connectors checked as soon as practical rather than ignoring it long term.
How do I fix SPN 3510 FMI 3?
Start by inspecting the ECU connectors and terminals for corrosion or damage, then check the harness for shorts, pinches, or melted wiring on the Sensor Supply #2 circuit. Inspect the connected sensors for shorts or bad terminals. If everything checks out electrically, ECU software or the ECU itself may need attention.
Is there a reset procedure for this code?
No separate clearing step is listed. The code is present whenever the ignition is on and the overvoltage condition exists, so it should clear on its own once the root cause is repaired.