JLG Articulating Boom Lift 11 Fault Code: Sleep Mode
Also called All Systems OK, All Systems Ok, Charge Air Temperature, FSW Open, Low Oil Pressure, Low Oil Pressure - Below 7PSI
Sleep Mode · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Code 11 (SPN 174 / FMI 2) most commonly means the foot switch (FSW) is not engaged while a drive, steer, or boom function control is being activated in platform mode, so the machine will not enter the enabled state. On some systems the same flash code 1-1 also reports a sleep mode or a low oil pressure condition below 7 PSI, so context on the display matters.
Medium severity. The machine will simply refuse to move or function until the interlock condition is satisfied. It is not an emergency, but ignoring the underlying cause (bad footswitch, wiring fault, or low oil pressure signal) can leave you stuck in the field or mask a real sensor failure.
What does JLG Articulating Boom Lift error code 11 mean?
Fault code 11 on JLG articulating boom lifts is tied to SPN 174 / FMI 2 and covers several related conditions depending on the control system variant: an FSW (foot switch) open condition, a low oil pressure condition below 7 PSI, a charge air temperature sensor fault, or a normal sleep mode flash (1-1).
In the most common form, the machine is in platform mode and the operator activates a drive/steer or boom function control without the foot switch engaged. The controller will not allow the machine to enter the machine enabled state until the foot switch is pressed and the control is released and reactivated.
In sensor-fault variants, the code points to an open or shorted sensor circuit (short circuit or cable break) at the corresponding input, which disables the monitoring function tied to that sensor until it's repaired.
Common causes of 11
- Drive/steer or boom function control activated while the foot switch is not engaged, with the machine in platform mode.
- Sensor circuit fault at the corresponding input, such as a short circuit or a broken cable, which deactivates the associated monitoring function.
- Selector switch in the wrong position, an active inhibit run, or a low start battery voltage preventing the enabled state.
- Blown control fuse or loose wiring/connection in the control circuit.
- Low engine oil pressure, below 7 PSI, caused by low oil level, restricted oil supply lines, or a faulty oil pressure switch.
- Normal sleep mode entry, indicated by flash code 1-1, which requires no corrective action.
How to troubleshoot JLG Articulating Boom Lift 11: first checks
- Confirm whether the display is simply showing flash code 1-1 for sleep mode; if so, no fault exists and no action is required.
- Release all controls, engage the foot switch fully, and reactivate the drive/steer or boom function control to see if the fault clears.
- Check the foot switch, its cable, and connector for damage, corrosion, or loose connections.
- Check the position of the selector switch and verify the inhibit run is released.
- Check the start battery voltage and inspect the control fuse for continuity.
- If a low oil pressure message is shown, check oil level, inspect oil supply lines for restriction, and verify the oil pressure switch operation with a test gauge.
- Check the corresponding sensor cable and sensor for the affected circuit, and check fault limits for that sensor if the tool allows it.
How the code clears
Release the controls, engage the foot switch, and reactivate the drive/steer or boom function control. If the fault is sensor-related, repair or replace the faulty sensor or cable and confirm the fault does not reset. No separate clearing step is listed for the low oil pressure or sleep mode variants beyond correcting the underlying condition.
Frequently asked questions
What does JLG fault code 11 mean?
It most often means the foot switch (FSW) was not engaged when a drive, steer, or boom function control was activated in platform mode, so the machine controller blocked the machine enabled state. The same code number can also represent a low oil pressure condition below 7 PSI, a sensor circuit fault, or simply a sleep mode flash (1-1).
Why won't my JLG boom lift move even though I'm pressing the controls?
If the foot switch is not fully engaged, the controller will not let the machine enter the enabled state. Release the controls, step firmly on the foot switch, then reactivate the drive/steer or boom control.
Is fault code 11 the same as sleep mode?
On some displays, flash code 1-1 simply indicates the machine has gone into sleep mode and requires no corrective action. Check the display context to know which condition you're actually seeing.
Can a bad oil pressure switch cause code 11?
Yes. If the reported oil pressure drops below 7 PSI, check oil level, oil supply lines, and verify the oil pressure switch itself with a test gauge, since a faulty switch can give a false low reading.
What should I check first if code 11 won't clear?
Start with the foot switch and its wiring, then check the selector switch position, inhibit run status, start battery voltage, and control fuse. These are the most common non-sensor causes.
Does a sensor fault deactivate other safety monitoring?
Yes. When a sensor circuit fails open or shorted, the associated monitoring function tied to that sensor is deactivated until the cable or sensor is repaired or replaced.