JLG Telehandler 8519 Fault Code: Load Moment - LSI Out of Calibration
Also called LSI Out of Calibration
Load Moment - LSI Out of Calibration · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Fault 8519 means the Load Sensing Indicator (LSI) system is out of calibration. The controller found that actual load cell raw counts are not within +/- 10 counts of the logged calibrated counts, or the LSI-CAN system check has not been completed. The machine will respond as if the load moment cutout percentage has been reached.
High severity. This code triggers the same response as an actual load moment cutout event, meaning lift functions can be restricted or shut down depending on market configuration. It should be treated as a stop-and-diagnose issue before resuming lifting work.
What does JLG Telehandler error code 8519 mean?
Fault 8519 relates to the Load Sensing Indicator, or LSI, system on JLG telehandlers. This system uses a load cell to measure the moment being placed on the machine by the load and boom position, and it compares live readings against calibrated reference values stored in the controller.
This code sets when the UGM (a control module in the LSI-CAN network) performs a system check and finds that the actual load cell raw counts are not within +/- 10 counts of the logged calibrated counts. It can also set if the LSI has never been calibrated, or if an operator tools LSI-CAN system check was attempted and failed to pass.
Because the load moment system is a safety function that prevents overloading and tip-over conditions, the control system treats this fault seriously. If active, it responds as though the load moment cutout percentage parameter has been reached, restricting or cutting out functions depending on how the machine is configured for its market.
What triggers a JLG Telehandler 8519 code?
The fault sets when the UGM LSI-CAN system check is performed and the actual load cell raw counts are not within +/- 10 counts of the logged calibrated counts. It can also set when the LSI has not been calibrated via the calibration to LSI-CAN check procedure, or when it is not within tolerance during an operator tools LSI-CAN system check.
Common causes of 8519
- LSI load cell has drifted out of calibration relative to the logged reference counts
- LSI has never been calibrated on this machine or after a component replacement
- LSI-CAN system check was attempted through operator tools and did not pass
- Load cell or related wiring issue causing raw counts to read inconsistently from the calibrated baseline
How to troubleshoot JLG Telehandler 8519: first checks
- Check whether the LSI-CAN system check has been completed and passed; if not, that alone can be the cause of the fault
- Inspect load cell wiring and connectors for damage, corrosion, or loose pins that could affect raw count readings
- Confirm whether the machine is in passive mode or LSI calibration mode, since the cutout will activate if it is in neither
- Review recent service history for any load cell replacement, boom repair, or other work that could have thrown off the calibrated counts
- Run the LSI calibration or LSI-CAN system check procedure through operator tools and watch whether it completes with a pass condition
How the code clears
This fault is not latched. It clears on its own once the LSI is properly calibrated, or once the LSI-CAN system check is performed again and completes with a pass condition. No separate reset procedure is listed for this code beyond successfully passing that check.
Frequently asked questions
What does JLG fault code 8519 mean?
It means the Load Sensing Indicator system on the telehandler is out of calibration. The controller found that load cell raw counts do not match the logged calibrated counts within +/- 10 counts, or the required LSI-CAN system check has not been completed and passed.
Can I still operate the telehandler with fault 8519 active?
The control system will respond as if the load moment cutout has been reached, which can restrict lifting functions depending on market configuration. It is not safe to rely on the load moment protection system while this fault is active, so lifting work should stop until calibration is confirmed good.
How do I clear fault code 8519?
The fault is not latched, so it clears automatically once the LSI is calibrated correctly or once the LSI-CAN system check is run again and completes with a pass condition. There is no separate manual reset step listed.
What causes the LSI to go out of calibration?
It can happen if the load cell has never been calibrated, if a previous calibration check failed to pass, or if the load cell raw counts have drifted from the stored calibrated reference, possibly due to a wiring or component issue.
Does fault 8519 affect boom or lift functions?
Yes. Because the LSI system feeds the load moment cutout logic, an active fault causes the machine to react as though the load moment cutout percentage has been reached, which can limit or stop lift functions depending on how the machine is configured.
Is fault 8519 the same as a load cell failure?
Not necessarily. It specifically indicates the load cell readings are out of tolerance with the calibrated baseline or that calibration was never completed or passed. A failing load cell or wiring problem could be the underlying cause, but the fault itself is a calibration mismatch indicator.