John Deere Engines SPN611FMI3 Fault Code: Injector Drive #1 Shorted to Voltage Source
Also called Electronic Injector Wiring Shorted To Power Source, Electronic Injector Wiring Shorted to Power Source, Electronic Unit Pump Circuit Shorted to Voltage Source, Injector Drive Shorted to Voltage Source, Injector Needle Control Valve Drive Shorted to Voltage Source, Injector Shorted to Voltage Source, Injector Wiring Shorted To Power Source, Injector Wiring Shorted to Power Source
Injector Drive #1 Shorted to Voltage Source · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
SPN 611 FMI 3 (also seen as DTC 000611.03) means the ECU has detected that electronic injector or electronic unit injector wiring is shorted to a power source. The engine keeps running with normal control logic, but you may see a cylinder misfire, gray or black smoke, or in some cases the engine running poorly or stalling depending on where the short is located.
High severity. The ECU does not change how it controls the system when this code is active, but a shorted injector circuit can cause a misfire, rough running, stalling, or smoke, and one troubleshooting reference lists the alarm level as Stop. Diagnose promptly rather than running the equipment indefinitely with this code active.
What does John Deere Engines error code SPN611FMI3 mean?
SPN 611 FMI 3 applies to Electronic Unit Injectors (EUI) on 10.5 L and 12.5 L engines, Electronic Injectors (EI) on 8.1 L, 4.5 L, and 6.8 L engines, and related injector drive circuits. On EUI engines, each injector combines the injection pump and injector in one unit mounted in the cylinder head, spraying directly into the cylinder bore, and operates at much higher pressure than standard in-line or rotary pumps. On EI engines, the injector gets high pressure fuel from a common rail and uses a Two-Way Valve (TWV) to control injection.
In both designs, power to the injectors is supplied on shared common wires, typically one wire feeding cylinders 1, 2, and 3, and a second wire feeding cylinders 4, 5, and 6 (on 4.5 L engines the pairing is cylinders 1 and 4 on one wire, and 2 and 3 on the other). The ECU controls each individual injector by opening and closing that injector's own ground (low side) circuit. This code sets when the ECU detects that this wiring, whether on the shared power side or an individual ground side, is shorted to a voltage source instead of behaving as expected.
One troubleshooting reference notes that the ECU has two internally connected terminals providing a shared high voltage supply to all injectors, and that the short can occur on either the injector high side wiring or the low side wiring. Because the fault sits in the wiring or connectors rather than in ECU logic changes, the practical symptoms depend heavily on exactly where the short is.
What triggers a John Deere Engines SPN611FMI3 code?
The DTC can be displayed while the engine is cranking or running with the error condition active. It is also displayed during the Harness Diagnostic Mode Test in Service ADVISOR, provided fuel rail pressure is below 5 MPa (725 psi) at the time of the test.
Common causes of SPN611FMI3
- Bad terminals or connector at the EUI or EI harness connector
- Bad terminals or connector at the ECU (60-way and 48-way ECU connectors on EUI engines)
- Short in the harness between the ECU and the EUI/EI harness, including a short in the 90V circuit on 8.1 L engines
- Bad EUI or EI harness
- Bad ECU
- Bad ECU software (listed for the troubleshooting sequence variant)
How to troubleshoot John Deere Engines SPN611FMI3: first checks
- Without disconnecting anything, visually inspect the ECU connectors (60-way and 48-way where applicable) and the injector harness connector for contamination, damage, corrosion, or poor terminal positioning.
- Check the wiring between the ECU and the injector harness connector for chafing, pinching, or damage that could cause a short to a power source.
- Inspect the 8-way injector harness connector terminals and connector body for damage or looseness, if equipped.
- Look closely at both the shared injector power (high side) wiring and the individual injector ground (low side) wiring, since a short on either side can set this code.
- If the visual inspection is clean, move to guided electrical testing of harness continuity and insulation resistance before condemning the ECU.
How the code clears
No separate clearing step is listed. Once the underlying short in the wiring, connector, or ECU is found and repaired, the code should stop being active on the next key cycle or engine run. If the code was captured during a Service ADVISOR Harness Diagnostic Mode Test, confirm fuel rail pressure was below 5 MPa (725 psi) when interpreting that result.
Frequently asked questions
What does SPN 611 FMI 3 mean on a John Deere engine?
It means the engine ECU has detected that injector wiring, either the shared power supply side or an individual injector's ground side, is shorted to a power source. It affects electronic unit injectors (EUI) or electronic injectors (EI) depending on engine size.
Can I keep running the engine with this code active?
The ECU does not change its control strategy when this code is active, so the engine may keep running, but you could see a cylinder misfire, gray or black smoke, or rough running and stalling depending on where the short is. One reference lists the alarm level as Stop, so this should be diagnosed as soon as possible rather than ignored.
Why does this code cause a misfire or smoke?
A short to a power source on injector wiring can interfere with the ECU's ability to properly energize and de-energize the injector's solenoid or Two-Way Valve. That disrupts fuel delivery timing or quantity on the affected cylinder or cylinders, which shows up as a misfire or unburned fuel producing smoke.
Where should a technician start looking for this fault?
Start with a visual inspection of the ECU connectors and the injector harness connector, without disconnecting them, checking for contamination, damage, or poorly seated terminals. Then check the wiring between the ECU and injector harness for damage, since the short can be on either the shared power wiring or the individual ground circuits.
Is this the same code across all John Deere engines?
The set condition is the same, injector wiring shorted to a power source, but the injector design differs by engine. 10.5 L and 12.5 L engines use EUIs, while 8.1 L, 6.8 L, and 4.5 L engines use EIs with a common rail and Two-Way Valve. The listed possible causes are similar across all of them, focused on terminals, connectors, harness, and the ECU itself.
Does a bad ECU commonly cause this code?
A bad ECU or, in one troubleshooting sequence, bad ECU software is listed as a possible cause, but it is generally lower on the list after wiring, terminals, and connectors. Rule out harness and connector problems first before condemning the ECU.