JLG Telehandler 2344 Fault Code: Ground Controls - Boom Angle Sensor - Out of Range High
Ground Controls - Boom Angle Sensor - Out of Range High · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Code 2344 sets when the UGM (upper ground module) sees more than 4.4 volts at the boom angle sensor input during operation or calibration. The machine substitutes a fixed boom angle value of 99 degrees, derates lift up, and ignores hydraulic function requests from the platform module. It latches until the machine is power cycled.
High severity. The machine keeps running but disables platform module hydraulic function requests and derates max lift up. Boom angle feedback to the controller is no longer trustworthy, so treat this as a stop-and-diagnose condition before resuming normal lift work.
What does JLG Telehandler error code 2344 mean?
Fault code 2344 is JLG's designation for a boom angle sensor signal that the ground controls system (UGM) has read as out of range high. The boom angle sensor tells the controller what angle the boom is sitting at so it can apply the correct load and lift charts, interlocks, and stability limits.
When the UGM sees a voltage above 4.4 volts on this input, it assumes the sensor or its wiring has failed rather than trusting the reading. Since the controller cannot verify the real boom angle, it falls back to a fixed substitute value of 99 degrees on the cabin display so the operator knows the reading is not real.
Because boom angle feeds directly into lift capacity and hydraulic function permissions, the controller responds by derating the max lift up value and refusing all hydraulic function requests coming from the platform module until the fault is resolved and the machine is power cycled.
What triggers a JLG Telehandler 2344 code?
During operation or calibration, the UGM detects a voltage at the boom angle sensor input of more than 4.4 volts.
Common causes of 2344
- A failed or failing boom angle sensor sending a signal above the valid range
- A short to a higher voltage source, such as a battery supply wire, in the sensor wiring harness
- A damaged, corroded, or partially disconnected sensor connector causing an open or floating signal wire that pulls the input high
- Wiring rubbed through or pinched against the boom structure, allowing contact with a higher-voltage circuit
- A failed connection at the UGM input pin for the boom angle sensor circuit
How to troubleshoot JLG Telehandler 2344: first checks
- Check the cabin display for the fixed boom angle reading of 99 degrees, which confirms the fault is active
- Inspect the boom angle sensor connector and pigtail for corrosion, bent pins, or a loose connection
- Trace the sensor signal wire for chafing or pinch points along the boom where it could be shorting to a higher voltage circuit
- Verify the sensor itself is seated and mounted correctly and is not physically damaged
- Check the wiring harness at the UGM connector for the boom angle circuit for a poor pin connection or backed-out terminal
- If a calibration is in progress when the fault appears, expect it to fail with a 'calibration: sensor fault' message on the display
How the code clears
This fault latches until the machine is power cycled. After correcting the wiring or sensor fault, cycle the key off and back on to clear the latch. No separate reset procedure is listed for this code beyond the power cycle.
Frequently asked questions
What does JLG fault code 2344 mean?
It means the ground controls system detected a boom angle sensor signal reading above 4.4 volts, which is outside the valid range. The controller assumes the sensor or wiring has failed and substitutes a fixed boom angle value of 99 degrees.
Can I keep operating the telehandler with code 2344 active?
The machine will still run, but it derates max lift up and ignores all hydraulic function requests from the platform module. Since the real boom angle is unknown, it is not safe to rely on lift charts or stability limits until the fault is fixed.
Why does the display show a boom angle of 99?
That is a fixed substitute value the controller assigns whenever it detects the sensor signal is out of range high. It is not a real angle reading, it is a flag that the sensor input has failed.
Will code 2344 clear itself?
No. It latches until the machine is power cycled. Fixing the underlying wiring or sensor problem and then cycling the key off and on is required to clear it.
What causes the boom angle sensor voltage to read too high?
Common causes include a failed sensor, a short to a higher voltage supply wire in the harness, a damaged or corroded connector creating an open signal path, or chafed wiring contacting another circuit.
Does code 2344 affect calibration?
Yes. If a boom angle sensor calibration is in progress when this fault triggers, the calibration fails and displays a 'calibration: sensor fault' message.
Where should I start looking when I get this code?
Start at the boom angle sensor connector and wiring harness. Check for corrosion, loose pins, and chafed wires before assuming the sensor itself is bad.