JLG Telehandler 8518 Fault Code: Load Moment - LSI Cutout Output - Short to Battery or Open Circuit
Also called LSI Cutout Output - Short to Battery or Open Circuit
Load Moment - LSI Cutout Output - Short to Battery or Open Circuit · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Fault code 8518 sets when the Load Sensing Indicator (LSI) system detects a short to battery or an open circuit on its 100% cutout digital output, and reports this over the CAN bus to the UGM (Upper Ground/General Module). The machine responds as if the load moment cutout percentage has been reached, putting the telehandler into LSI cutout with operation only available through the LSI cancel switch (creep mode). The fault latches until a power cycle.
High severity. This code forces the machine into a restricted creep-mode operating state and signals a wiring or output fault in the load moment/LSI safety system. It is not an immediate engine or hydraulic damage risk, but it directly limits lifting capability and should be diagnosed before returning the machine to normal load-handling duty.
What does JLG Telehandler error code 8518 mean?
Fault code 8518 relates to the LSI (Load Sensing Indicator) system, which monitors the machine's load moment and cuts off lifting functions when a set percentage of rated capacity is reached. The LSI's 100% cutout output is a digital signal that tells the control system the load has reached the cutout threshold.
This code means the control system has detected that this digital output is either shorted to battery voltage or has become an open circuit, rather than switching normally. Since the system cannot trust the signal, it treats the condition as if the load moment cutout point has actually been reached, and it reacts according to the market configuration in place.
In practice this puts the machine into LSI cutout, meaning normal lift operation is blocked and only creep mode operation through the LSI cancel switch is available. The fault also sets a CAN bus bit that lets the LSI system take over display and alarm control.
What triggers a JLG Telehandler 8518 code?
The LSI system detects a short to battery or open circuit condition on its 100% cutout digital output and reports this over the CAN bus to the UGM. One listed variant ties the trigger to the OMD (on-board moment display, based on context) reading showing 100% at the same time the LSI module detects the condition.
Common causes of 8518
- A wiring fault on the LSI 100% cutout digital output circuit, either shorted to battery voltage or broken/open.
- A failed or faulty connection at the LSI sensor or gauge wiring, as pointed to directly in the diagnostic notes.
- A degraded connector, pin, or splice in the LSI output circuit causing an intermittent open condition.
- Damage to the LSI module output driver itself, though this should be confirmed only after wiring is cleared.
How to troubleshoot JLG Telehandler 8518: first checks
- Check the LSI gauge and sensor wiring first, since this is the specific inspection point called out for this fault.
- Inspect the 100% cutout digital output circuit for signs of chafing, pinched wire, corrosion, or a loose connector that could cause a short to battery or an open circuit.
- Verify all LSI-related connectors are fully seated and free of corrosion, especially at the sensor, gauge, and module connections.
- Confirm the machine is actually in creep mode via the LSI cancel switch as expected, which helps confirm the fault is active and not a display-only glitch.
- Check for battery voltage present where it should not be on the cutout output wire, which points toward a short to battery rather than an open circuit.
How the code clears
This fault latches and requires a power cycle to clear once the underlying wiring or sensor issue has been corrected. Simply cycling the key will not clear it if the short to battery or open circuit condition is still present, since the LSI system will re-detect the fault and re-latch it.
Frequently asked questions
What does JLG fault code 8518 mean?
It means the LSI (Load Sensing Indicator) system detected that its 100% load moment cutout digital output is either shorted to battery voltage or has become an open circuit, and it reported this to the UGM over the CAN bus.
Why is my JLG telehandler stuck in creep mode?
When code 8518 is active, the control system treats the situation as if the load moment cutout point has been reached. This forces the machine into LSI cutout, where normal lift operation is blocked and only creep mode via the LSI cancel switch is available.
How do I clear fault code 8518?
The fault is latched until a power cycle. Correct the wiring or sensor issue on the LSI 100% cutout output circuit first, then cycle power to the machine. If the underlying short or open circuit is still present, the fault will simply set again.
What should I check first for code 8518?
Check the LSI gauge and sensor wiring, since that is the specific point called out for this fault. Look closely at the 100% cutout digital output circuit for a short to battery voltage or an open circuit.
Is it safe to keep operating the machine with code 8518 active?
The machine will already be restricted to creep mode operation through the LSI cancel switch, so full lifting functions are not available. Because this affects the load moment safety system, the wiring fault should be found and corrected before resuming normal load-handling work.
Can a bad connector cause fault code 8518?
Yes. A loose, corroded, or damaged connector or splice in the LSI 100% cutout output wiring can create either an open circuit or an unintended short to battery, both of which will trigger this fault.