JLG Telehandler 99154 Fault Code: Hardware - LSI Faulty - Load Cells A and B Disagreement
Also called LSI Faulty - Load Cells A and B Disagreement
Hardware - LSI Faulty - Load Cells A and B Disagreement · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Code 99154 sets when the Load Sensing Indicator (LSI) system finds an unacceptable variance between load cell A and load cell B and reports it over the CAN bus to the UGM or ground module. The machine defaults to LSI cutout behavior, and the code latches until a power cycle, recalibration, or LSI sensor replacement.
High severity. This fault causes the control system to treat the machine as if the load moment cutout has been reached, restricting normal lift operation. It is not an immediate mechanical damage risk, but it takes away confidence in the load sensing system, which protects against overload and tip-over. Treat it as a stop-and-diagnose issue before resuming lift work.
What does JLG Telehandler error code 99154 mean?
Code 99154 means the LSI (Load Sensing Indicator) system has compared readings from load cell A and load cell B and found them too far apart to trust. Since these two load cells are supposed to agree closely, a disagreement tells the control system that at least one sensor, or the wiring or calibration behind it, is unreliable.
When this happens, the control system does not just log a warning. It defaults the machine to LSI cutout behavior, treating the situation as if the load moment cutout percentage parameter has been reached. Depending on how the machine is configured for its market, this can restrict lift functions and only allow operation in creep mode using the LSI cancel switch.
The fault also sets a CAN message bit that hands control of the LSI alarm display over to the LSI system itself, so the operator will typically see an active alarm on the display tied to this condition.
What triggers a JLG Telehandler 99154 code?
The LSI system detects an unacceptable variance between the readings from load cell A and load cell B and reports this disagreement over a CAN bus message to the UGM or ground module.
Common causes of 99154
- A fault or drift in load cell A or load cell B causing its readings to diverge from the other sensor.
- Wiring or connector issues on one of the load cell circuits causing an inaccurate signal to reach the LSI system.
- LSI calibration that is out of range or was not performed correctly, causing the two load cells to read differently under the same load.
- A failing LSI sensor or gauge assembly that needs replacement, as noted directly in the OEM guidance.
How to troubleshoot JLG Telehandler 99154: first checks
- Check the LSI display for an active alarm and note whether the machine is defaulting to LSI cutout with only creep mode available via the LSI cancel switch.
- Inspect the wiring and connectors at both load cell A and load cell B for corrosion, looseness, or damage.
- Confirm whether the machine is in passive mode or LSI calibration mode, since the action taken differs depending on this state.
- Attempt an LSI recalibration if the machine and procedure support it, since recalibration is one of the listed ways to clear the latch.
- If recalibration does not resolve the disagreement, plan for load cell or LSI sensor replacement.
How the code clears
This fault is latched. It clears only with a power cycle combined with either a recalibration of the LSI system or replacement of the LSI sensor. Simply cycling the key without correcting the underlying load cell disagreement is not expected to permanently clear the condition if the mismatch is still present.
Frequently asked questions
What does JLG fault code 99154 mean?
It means the LSI (Load Sensing Indicator) system found an unacceptable variance between load cell A and load cell B and reported the disagreement over the CAN bus. The control system then defaults to LSI cutout behavior.
Can I keep operating the telehandler with code 99154 active?
The control system will restrict normal lift operation, defaulting to LSI cutout with operation only available in creep mode through the LSI cancel switch. This is meant to keep you from lifting loads without a trustworthy load sensing system, so operation should be limited to getting the machine to a safe area for diagnosis.
How do I clear code 99154?
The fault is latched and requires a power cycle along with either recalibrating the LSI system or replacing the LSI sensor. No other reset procedure is listed for this code.
What is the difference between load cell A and load cell B?
Both load cells feed the LSI system so it can cross-check load readings. When their readings disagree beyond an acceptable margin, the system cannot trust either value, which triggers this fault.
Does code 99154 always mean I need a new load cell?
Not necessarily. Recalibration is listed as one valid fix, so a wiring issue or calibration drift could be the cause. If recalibration does not resolve the disagreement, replacement of the LSI sensor is the next step.
Will code 99154 disable the boom completely?
It does not necessarily disable the boom outright. Instead, the machine defaults to LSI cutout, and if the machine is not in passive mode or LSI calibration mode, operation is limited to creep mode using the LSI cancel switch.