JLG Telehandler 33243 Fault Code: UGM Output Drivers - Transmission B Coil - Open Circuit
UGM Output Drivers - Transmission B Coil - Open Circuit · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Fault 33243 sets when the UGM (universal ground module or main machine controller) detects an open circuit on output J2-32, which controls the transmission B control coil, on machines configured for powershift transmissions. The controller shuts off that output, flashes the gear selection and drive direction symbols on the cab display, and latches the fault until the machine is power cycled.
High severity. This code disables drive function tied to the transmission B coil and signals a wiring or coil fault. The machine may lose normal shifting or drive direction control, so it should be treated as a stop-soon condition rather than something to run through a shift.
What does JLG Telehandler error code 33243 mean?
Fault 33243 is set by the UGM when it detects an open circuit at output J2-32, the wire that drives the transmission B control coil. This only applies on machines where the transmission is configured as powershift.
When the open circuit is detected, the controller deactivates that output entirely as a protective measure and flashes both the gear selection and drive direction symbols on the cab display's LCD. This is meant to alert the operator that transmission control is affected and drive behavior may not respond as expected.
The fault latches, meaning it will not clear on its own even if the circuit becomes intact again. It stays active until the machine undergoes a full power cycle.
What triggers a JLG Telehandler 33243 code?
The fault sets when a transmission configuration of powershift is configured and the UGM detects an open circuit at output J2-32, the transmission B control coil driver.
Common causes of 33243
- Open circuit in the wiring harness between the UGM output J2-32 and the transmission B control coil
- Failed or open transmission B control coil (solenoid) itself
- Corroded, loose, or disconnected connector pins at J2-32 or at the coil connector
- Damaged or chafed wiring causing a break in the circuit path
How to troubleshoot JLG Telehandler 33243: first checks
- Inspect the wiring harness routing between the UGM connector J2-32 and the transmission B control coil for visible damage, chafing, or pinched sections
- Check connector pins at both the UGM side and the coil side for corrosion, looseness, or bent pins
- Verify the transmission is actually configured as powershift, since this fault only applies under that configuration
- Test continuity of the wire and coil circuit with the machine safely shut down and power removed
- Check the gear selection and drive direction symbols on the cab display to confirm the flashing indicator matches this fault
How the code clears
This fault latches until the machine is power cycled. No separate clearing step is listed beyond correcting the open circuit and cycling power to the machine. Simply cycling power without fixing the underlying open circuit will likely allow the fault to set again as soon as the UGM re-checks the output.
Frequently asked questions
What does fault code 33243 mean on a JLG telehandler?
It means the UGM, the machine's main controller, detected an open circuit at output J2-32, which drives the transmission B control coil. This only triggers on machines configured with a powershift transmission.
Why are the gear selection and drive direction symbols flashing on my JLG display?
The UGM flashes these symbols as part of its response to fault 33243. It's a direct indicator tied to the deactivated transmission B control coil output, letting the operator know drive control may be affected.
Will the fault clear itself if I fix the wiring?
No. The fault latches until the machine is power cycled. Even after repairing the open circuit, you need to cycle power to clear the latched fault code.
Can I keep operating the telehandler with this fault active?
Operating with this fault active is not advisable. The transmission B control coil output has been deactivated by the controller, which can affect gear selection and drive direction, so the safest approach is to stop and diagnose before continuing work.
Does this fault apply to all JLG telehandler transmissions?
No. It only applies to machines where the transmission is configured as powershift. If the transmission configuration is different, this specific fault would not be relevant.
What should I check first if I get code 33243?
Start with the wiring harness and connectors between the UGM output J2-32 and the transmission B control coil, checking for open circuits, corrosion, or damage, then verify the coil itself is functional.