JLG Telehandler 8517 Fault Code: Load Moment - LSI Load Cell B - Out of Range
Also called LSI Load Cell B - Out of Range
Load Moment - LSI Load Cell B - Out of Range · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Fault 8517 means the JLG Load Sensing Indicator (LSI) system has detected that Load Cell B is reading out of range and is telling the machine's UGM (Universal Ground Module) over the CAN bus. The machine treats this as system distress and will act as if the load moment cutout percentage has been reached, cutting operation back to LSI cancel switch creep mode until the fault is cleared by a power cycle.
High severity. The machine automatically restricts operation to creep mode via the LSI cancel switch once this fault sets, which stops normal work until it is diagnosed. It is not an immediate mechanical damage risk, but it is a functional load-monitoring failure that should not be ignored or worked around.
What does JLG Telehandler error code 8517 mean?
Fault 8517 is set by the LSI (Load Sensing Indicator) system when it detects that Load Cell B is out of range and reports this over the CAN bus to the UGM (Universal Ground Module). The LSI system is responsible for monitoring the load moment on the telehandler and warning or stopping operation before an overload condition develops.
When this fault is active, the control system responds as if the load moment cutout percentage parameter has already been reached, reacting according to the machine's market configuration. In practice, this means the machine goes into LSI cutout, and normal lift operation is only available through the LSI cancel switch, which puts the machine into creep mode.
The control system also sets a CAN message bit that allows the LSI display to control its own internal alarm, so the operator should see an alarm indication on the LSI gauge or display tied to this condition.
Common causes of 8517
- Load Cell B itself has failed or is producing a reading outside its valid operating range.
- Wiring or connector problems at the LSI gauge or sensor circuit, including damaged, corroded, or loose connections.
- A CAN bus communication issue between the LSI system and the UGM that prevents a valid reading from being recognized.
How to troubleshoot JLG Telehandler 8517: first checks
- Check the LSI gauge and sensor wiring for damage, corrosion, or loose connectors, as this is the specific check called out for this fault.
- Inspect the wiring harness and connectors along the run to Load Cell B for pinched, chafed, or disconnected wiring.
- Confirm the LSI display is showing an active alarm and note whether the OMD (Overload Moment Device) reading is at 100 percent, which is the condition tied to this fault triggering.
- Verify the machine is in LSI cutout with operation limited to creep mode via the LSI cancel switch, confirming the control system has reacted as expected.
How the code clears
This fault latches and stays active until the machine is power cycled. The diagnostic guidance for this fault is to check the LSI gauge and sensor wiring, since faulty wiring or connections at Load Cell B are the primary suspect. After inspecting and correcting any wiring or connector issues, cycle power to the machine to attempt to clear the latched fault. No separate reset procedure beyond the power cycle is listed for this code.
Frequently asked questions
What does JLG fault code 8517 mean?
It means the LSI (Load Sensing Indicator) system has detected that Load Cell B is out of range and has reported this to the UGM over the CAN bus. The machine reacts as if the load moment cutout limit has been reached.
Why is my JLG telehandler stuck in creep mode with the LSI alarm on?
When fault 8517 is active, the machine automatically goes into LSI cutout, and normal operation is only available through the LSI cancel switch, which limits the machine to creep mode. This is the expected reaction to Load Cell B being out of range.
How do I clear fault code 8517 on a JLG telehandler?
The fault is latched and only clears with a power cycle of the machine. Before cycling power, check the LSI gauge and sensor wiring, since a wiring or connector fault at Load Cell B is the specific cause identified for this code.
What is Load Cell B on a JLG telehandler?
Load Cell B is one of the sensors in the LSI (Load Sensing Indicator) system used to monitor load moment on the machine. When its reading falls out of valid range, the control system flags fault 8517 and restricts operation for safety.
Is it safe to keep operating with fault 8517 active?
The machine itself limits you to creep mode operation through the LSI cancel switch once this fault is active, so full lifting operation is not available. Because this affects load moment monitoring, the wiring and sensor should be inspected before returning the machine to normal service.
Will fault 8517 clear itself?
No. It is a latched fault that requires a power cycle to clear, and if the underlying wiring or sensor issue with Load Cell B is not corrected, the fault is likely to set again.