JLG Telehandler 33249 Fault Code: UGM Output Drivers - Transmission A Coil - Open Circuit
UGM Output Drivers - Transmission A Coil - Open Circuit · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Code 33249 sets when the UGM (universal ground module or main machine controller) detects an open circuit on the transmission A coil output, wired through J2-33, on machines configured for powershift transmission. The controller deactivates the J2-33 transmission reverse coil output and flashes the gear selection and drive direction symbols on the cab display. The fault latches until the machine is power cycled.
High severity. This code shuts down a transmission drive function (reverse coil output on J2-33) and signals a wiring or coil fault. The machine may lose reverse or shifting capability until the circuit is repaired and power is cycled, so it should be diagnosed before continued operation.
What does JLG Telehandler error code 33249 mean?
Fault code 33249 is set by the UGM, the controller that manages machine-level systems including the transmission, when it detects an open circuit on the transmission A coil output. This only applies to machines configured with a powershift transmission.
When this open circuit is detected, the UGM deactivates the J2-33 transmission reverse coil output as a protective response. At the same time, it flashes the gear selection and drive direction symbols on the cab display's LCD to alert the operator that something is wrong with transmission shifting.
This is listed as a machine system distress indicator, meaning it reflects a fault that affects how the machine drives and shifts, not just a minor sensor glitch. Because the transmission reverse coil is disabled, the operator may notice loss of reverse function or abnormal shifting behavior.
What triggers a JLG Telehandler 33249 code?
The UGM sets this fault when the transmission is configured as powershift and the controller detects an open circuit at the J2-33 transmission A coil output.
Common causes of 33249
- Open circuit in the wiring harness between the UGM and the transmission A coil connector at J2-33
- Failed or damaged transmission reverse coil (open winding)
- Corroded, loose, or disconnected connector pins at the J2-33 circuit
- Transmission not actually configured for powershift but the parameter is set incorrectly, causing the UGM to expect a circuit that does not behave as wired
How to troubleshoot JLG Telehandler 33249: first checks
- Inspect the wiring harness and connectors at J2-33 for visible damage, chafing, or disconnection
- Check the transmission A coil connector for corrosion, loose pins, or moisture intrusion
- Test continuity of the transmission reverse coil winding to confirm it is not open
- Verify the transmission configuration parameter in the controller matches the actual installed transmission (powershift or not)
- Confirm the machine display is showing the flashing gear selection and drive direction symbols consistent with this fault before doing further teardown
How the code clears
This fault latches until the machine is power cycled. After repairing the open circuit, whether in the wiring, connector, or coil itself, cycle machine power off and back on to clear the latched fault. No separate reset procedure is listed for this code.
Frequently asked questions
What does fault code 33249 mean on a JLG telehandler?
It means the UGM controller detected an open circuit on the transmission A coil output, wired through J2-33, on a machine configured for powershift transmission. The controller disables that output and flashes gear selection and drive direction symbols on the display.
Will my telehandler still drive with code 33249 active?
The J2-33 transmission reverse coil output is deactivated when this fault is active, which can affect shifting or reverse function. Treat it as a drive-related fault that needs diagnosis before continued operation.
How do I clear fault code 33249?
Repair the open circuit causing the fault, then cycle machine power off and back on. The fault is latched until a power cycle, and no other reset procedure is listed.
What is J2-33 on a JLG telehandler?
J2-33 is the output circuit connector pin identified for the transmission reverse coil that the UGM monitors for this fault.
Does this code apply to all JLG telehandler transmissions?
No. This fault only sets on machines configured with a powershift transmission. If the transmission configuration is set incorrectly, the UGM may still trigger this fault even if the wiring itself is fine, so verify the configuration parameter as part of diagnosis.
What should I check first if I see code 33249?
Start by inspecting the wiring and connector at J2-33 for damage or corrosion, then test the transmission A coil for continuity to rule out an open winding, and confirm the transmission configuration setting matches the installed transmission type.