JLG Scissor Lift 2353 Fault Code: Ground Controls - Boom Angle Sensor - Internal Failure
Ground Controls - Boom Angle Sensor - Internal Failure · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Fault 2353 fires when JLG's control system detects an internal failure in the CAN based boom angle sensor read from the ground module. The display shows a fixed boom angle value of 99 and hydraulic function requests from the platform module are ignored until the fault is cleared with a power cycle.
High severity. This code causes the machine to disallow calibration, ignore platform hydraulic requests, and either shut off or derate lift up function. It is not an immediate safety emergency, but the machine's lifting capability is intentionally restricted until the sensor issue is resolved.
What does JLG Scissor Lift error code 2353 mean?
Fault 2353 is set when the UGM (Universal ground module) or platform module detects an internal failure in the CAN based boom angle sensor. The boom angle sensor tells the controller where the boom is positioned so it can apply the correct lift envelope and safety limits.
When this fault is active, the display shows a fixed boom angle value of 99 instead of a real reading, and the controller temporarily assigns that same fixed value internally. Calibration of the boom angle sensor is disallowed and any attempt shows a 'boom angle: calibration fail' message.
Because the controller can no longer trust the real boom angle, it ignores all hydraulic function requests coming from the platform module. If a platform is attached or platform mode is active, the lift up output is deactivated and inhibited entirely. If no platform is detected, the machine instead derates the maximum lift up speed according to the lift up derate value set in the constant data tables.
What triggers a JLG Scissor Lift 2353 code?
The UGM or platform module sets this fault when it detects one of two internal failures in the CAN based boom angle sensor: a difference of more than 7 counts (2.5 degrees) for 1 second between the two angle readings, or a CAN bus message showing a boom angle value out of the calibration range, meaning more than 250 counts.
Common causes of 2353
- Internal failure of the CAN based boom angle sensor itself, where its two internal angle readings disagree by more than the allowed difference.
- A boom angle value reported over the CAN bus that falls outside the valid calibration range, indicating the sensor has lost its calibrated reference or is reporting corrupted data.
- Wiring or connector issues on the CAN bus feeding the boom angle sensor signal to the UGM or platform module, which can cause intermittent or corrupted angle data.
- Prior failed or incomplete calibration of the boom angle sensor that leaves it reporting values outside the expected range.
How to troubleshoot JLG Scissor Lift 2353: first checks
- Check the display for the fixed boom angle value of 99 and confirm fault code 2353 is active before doing further diagnostics.
- Inspect the CAN wiring and connectors at the boom angle sensor and at the UGM and platform module connections for corrosion, looseness, or damage.
- Attempt to recalibrate the boom angle sensor and note whether it fails with a 'boom angle: calibration fail' message, which confirms the controller is blocking calibration due to this fault.
- Check whether a platform is attached or platform mode is active, since this determines whether lift up is fully disabled or just derated, and helps confirm the fault's practical effect on the machine.
- Inspect the physical mounting and condition of the boom angle sensor itself for signs of damage or contamination that could cause internal disagreement between its readings.
How the code clears
This fault latches until a power cycle. Once the underlying sensor or wiring issue is corrected, cycle power to the machine to clear the fault and confirm normal boom angle readings return on the display before resuming normal operation.
Frequently asked questions
What does JLG fault code 2353 mean?
It means the ground control system has detected an internal failure in the CAN based boom angle sensor. The controller no longer trusts the boom angle reading and restricts lift functions until the issue is fixed and power is cycled.
Why does my JLG scissor lift display show boom angle 99?
A fixed value of 99 is displayed and temporarily assigned internally whenever fault 2353 is active, since the real boom angle sensor reading is considered unreliable.
Why can't I calibrate the boom angle sensor on my JLG lift?
Fault 2353 specifically disallows boom angle sensor calibration while active, and any attempt will show a 'boom angle: calibration fail' message on the display.
Will my JLG lift still raise the platform with fault 2353 active?
It depends on whether a platform is attached or platform mode is active. If so, the lift up output is deactivated and inhibited. If not, lift up is still allowed but derated according to the lift up derate value in the constant data tables.
How do I clear fault code 2353 on a JLG scissor lift?
This fault latches until a power cycle. After correcting the sensor or wiring problem, cycle the machine's power to clear it. No separate clearing step is listed beyond the power cycle.
What triggers fault 2353 in the boom angle sensor?
The controller sets this fault when the two internal boom angle sensor readings differ by more than 7 counts (2.5 degrees) for 1 second, or when the sensor reports a boom angle value out of calibration range, more than 250 counts.