JLG Telehandler 33200 Fault Code: UGM Output Drivers - Auxiliary Function-B - Short to Ground
UGM Output Drivers - Auxiliary Function-B - Short to Ground · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Fault code 33200 means the JLG UGM (main controller) detected a short to ground on the auxiliary function-B output driver, or lost current feedback on that circuit and flagged it as the likely cause. The machine responds by shutting down auxiliary function-B, disabling both auxiliary function-A and B current feedback, and killing the continuous auxiliary hydraulics feature and its indicator. This code latches until the machine is power cycled.
Medium severity. This is a system distress indicator that disables auxiliary hydraulic functions rather than the whole machine, but continuous auxiliary hydraulics and both auxiliary functions go dark until the fault is cleared and power is cycled. Attachments relying on auxiliary hydraulics will not work until this is fixed.
What does JLG Telehandler error code 33200 mean?
Fault code 33200 is set by the UGM (the machine's main control module) when it detects a short to ground at the output that drives auxiliary function-B, or when it loses the current feedback signal that tells it the valve is drawing the current it expects. The UGM sets an internal flag either way, and uses that flag to help decide whether this specific fault condition is the actual root cause.
Because the current feedback path (wire feeding into J3-14, the auxiliary return) is shared, losing that feedback affects both auxiliary function-A and auxiliary function-B, not just function-B. This is why the controller disables both functions even though the fault is logged against function-B specifically.
The auxiliary function-B output itself is at J2-20. When the UGM sees a short to ground here, it treats it as a wiring or valve coil fault and shuts the output down to protect the driver circuit inside the module.
Common causes of 33200
- A pinched, chafed, or corroded wire in the auxiliary function-B output circuit shorting to a grounded surface
- A failed or shorted solenoid coil on the auxiliary function-B valve
- Water intrusion or corrosion at the J2-20 connector pins causing a ground path
- A broken or intermittent connection at the current feedback input J3-14 (aux return) that the UGM interprets as a lost feedback condition
- Damage inside the UGM output driver itself if the short has been present repeatedly without repair
How to troubleshoot JLG Telehandler 33200: first checks
- Inspect the wiring harness from the UGM to the auxiliary function-B valve for chafe points, pinches, or exposed conductors touching the frame or other grounded metal
- Check the J2-20 connector and the J3-14 aux return connector for corrosion, moisture, bent pins, or loose terminals, and clean or reseat as needed
- Disconnect the auxiliary function-B valve coil and check it for a short to the machine chassis or frame ground using a multimeter set to resistance or continuity
- Trace the aux return circuit back through the harness to confirm continuity is not broken or intermittently open at J3-14
- Look for signs of pinched wiring near boom pivots, chassis pass-throughs, or areas exposed to abrasion where the harness routes toward the valve bank
How the code clears
No separate clearing step is listed beyond the stated latch condition. This fault latches until the machine is power cycled, so after repairing the short or feedback fault, turn the key off, wait, and restart to allow the UGM to clear the flag and re-enable auxiliary function-A, function-B, and the continuous auxiliary hydraulics feature.
Frequently asked questions
What does JLG fault code 33200 mean?
It means the UGM controller detected a short to ground on the auxiliary function-B valve output, or lost the current feedback signal for that circuit and flagged it as the probable cause. Either condition shuts down auxiliary function-B and disables continuous auxiliary hydraulics.
Why did my attachment stop working after this fault?
Because the UGM disables both auxiliary function-A and function-B current feedback when this fault sets, even though the fault is tied specifically to function-B. Since attachments often run on these auxiliary circuits, they will stop responding until the fault is repaired and cleared.
How do I clear fault code 33200 on a JLG telehandler?
Fix the underlying short to ground or restore the current feedback connection at J3-14, then power cycle the machine. This fault latches until a power cycle, so simply retrying the function without fixing the wiring or valve will not clear it.
Is fault code 33200 dangerous to keep operating with?
It is not described as an immediate safety shutdown of drive or lift functions, but it does disable auxiliary hydraulics and the continuous auxiliary hydraulics feature. If your work depends on attachments run through auxiliary function-B, you should not continue operating until it is diagnosed.
What is the difference between a short to ground and a lost current feedback condition for this code?
A short to ground means the output wiring or valve coil has an unintended path to a grounded surface, drawing excess current. A lost current feedback condition means the UGM isn't seeing the expected feedback signal at J3-14, which could be a broken wire or connector issue rather than an actual short. The UGM sets an internal flag to help distinguish which condition triggered the fault.
Where should I start looking for the cause of code 33200?
Start at the J2-20 output connector and the auxiliary function-B valve coil for a short, then check the J3-14 aux return connector and its wiring back to the UGM for corrosion, looseness, or breaks. Inspect the harness routing for chafe or pinch points along the way.
Will this fault affect other auxiliary functions besides function-B?
Yes. Because the current feedback input at J3-14 is shared, the UGM disables auxiliary function-A along with function-B when it decouples the feedback circuit, even though the fault code itself is specific to function-B.