JLG Telehandler 33264 Fault Code: UGM Output Drivers - Transmission 2 Coil - Open Circuit
UGM Output Drivers - Transmission 2 Coil - Open Circuit · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Fault 33264 is a JLG telehandler UGM (universal ground module) code indicating an open circuit at the transmission 2 coil output (J1-20). It only sets when the transmission is configured as hydrostatic. The controller shuts down both transmission coil outputs and holds the last valid gear until you cycle power.
High severity. The transmission stays locked in the last valid gear and both transmission coil outputs are disabled until a power cycle. The machine can still be driven in a limited way but gear selection is frozen, which is a real operational limit, not just a warning light.
What does JLG Telehandler error code 33264 mean?
Fault 33264 comes from the UGM, the controller that manages output drivers for various machine functions including the transmission coils on a hydrostatic-configured machine. This code specifically flags an open circuit at output J1-20, which drives the transmission 2 coil.
When the UGM detects this open circuit, it does not just flag transmission 2. It also deactivates and blocks activation of J1-7, the transmission 1 coil, as a protective measure. The system then holds whatever gear was last valid and flashes the gear selection symbol on the cabin display to let the operator know something is wrong.
This code only applies when the machine's transmission is configured as hydrostatic. If the transmission type is set differently, this particular open-circuit check does not apply the same way.
What triggers a JLG Telehandler 33264 code?
The UGM sets this fault when the transmission configuration is hydrostatic and it detects an open circuit condition at the J1-20 transmission 2 coil output.
Common causes of 33264
- Open circuit in the wiring between the UGM output J1-20 and the transmission 2 coil, including a broken or chafed wire
- Failed or burned-out transmission 2 coil winding causing an open circuit
- Corroded, loose, or disconnected connector pins at the transmission 2 coil or at the UGM connector for J1-20
- Damaged or pinched wiring harness near the transmission or UGM that has broken continuity
How to troubleshoot JLG Telehandler 33264: first checks
- Check the cabin display for the flashing gear selection symbol to confirm the fault is active before doing anything else
- Inspect the wiring harness and connectors between the UGM (J1-20) and the transmission 2 coil for visible damage, corrosion, or loose pins
- With the machine safely shut down and keys removed, check continuity of the wiring from J1-20 to the transmission 2 coil and check the coil itself for an open winding
- Inspect the J1-7 transmission 1 coil circuit as well, since the UGM disables it in response to this fault and a shared connector or harness section could be involved
- Verify the transmission configuration setting is correct for the machine, since this fault only applies when hydrostatic is configured
How the code clears
This fault latches until the power is cycled. After repairing the open circuit, whether it is a wiring break, bad connector, or failed coil, cycle machine power (key off, then back on) to clear the latched fault and let the UGM re-check the circuit. No separate reset procedure is listed for this code.
Frequently asked questions
What does JLG fault code 33264 mean?
It means the UGM detected an open circuit at output J1-20, the transmission 2 coil, on a machine configured with a hydrostatic transmission. The controller disables both transmission coil outputs and holds the last valid gear until you cycle power.
Can I keep operating the telehandler with fault 33264 active?
The transmission will stay locked in the last valid gear it had before the fault, since both transmission coil outputs get disabled. Treat this as a real operating limitation and get it diagnosed before continuing normal work, especially if you need to change gears or ranges.
Why does fault 33264 also affect transmission 1 coil?
The UGM deactivates and inhibits transmission 1 coil (J1-7) as a protective response whenever it sees the open circuit on transmission 2 coil (J1-20). This is intentional so the transmission does not end up in an unpredictable state.
How do I clear fault code 33264 after repairs?
Fix the open circuit, whether that is a wiring break, bad connector, or a failed transmission 2 coil, then cycle the machine's power off and back on. The fault is latched until power cycle and no other reset step is listed.
Does this fault apply to all JLG telehandler transmissions?
No. The trigger condition specifically requires the transmission to be configured as hydrostatic. If your machine uses a different transmission configuration, this open-circuit check on J1-20 works differently or may not apply.
What parts should I inspect first for fault 33264?
Start with the wiring and connectors between the UGM's J1-20 output and the transmission 2 coil, checking for corrosion, loose pins, or chafed wire. Also test the coil itself for an open winding, since a burned-out coil is a common open-circuit cause.