JLG Telehandler 2315 Fault Code: Ground Controls - Operating Mode Interlock - Stabilizers Not Deployed
Ground Controls - Operating Mode Interlock - Stabilizers Not Deployed · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Code 2315 sets when the platform station is active but the machine detects the stabilizers/outriggers are not deployed. JLG lists this as indicator 1 (machine system distress) and indicator 15 (outriggers not deployed, platform). It blocks mode changeover to platform mode and restricts lift, telescope, and engine start functions until the outrigger inputs read correctly.
High severity. This is not a code to work around. The machine deliberately restricts starter engagement and boom functions to keep the platform from operating without stabilizers properly deployed. Bypassing this interlock risks tip-over.
What does JLG Telehandler error code 2315 mean?
Fault 2315 is a ground controls operating mode interlock fault tied to the stabilizers (outriggers). It fires when the platform station is active but the controller sees that one or both outrigger-related inputs are not in the deployed state it expects.
JLG assigns two indicators to this fault: indicator 1, general machine system distress, and indicator 15, outriggers not deployed while in platform mode. Both point to the same underlying condition: the UGM (upper/ground module logic controlling operating mode) will not let the machine treat the stabilizers as deployed.
Because of this, the controller locks out several things at once. It will not allow a changeover into platform mode. If platform mode was already active, it inhibits lift, telescope, and in some cases engine start, following a strict retrieval sequence based on boom angle and any detected chassis tilt.
What triggers a JLG Telehandler 2315 code?
The fault sets when the platform station is active and one or both inputs J7-7 and J7-20 are low. It latches until J7-7 and J7-20 both become high again.
Common causes of 2315
- One or both outrigger deployment switches (wired to J7-7 and J7-20) are not signaling a deployed condition, either because the stabilizers are genuinely not fully deployed or because the switches are misadjusted.
- Wiring or connector faults on the J7-7 or J7-20 circuits, including corrosion, loose pins, or damaged wiring, that keep the input from reading high even when the stabilizer is physically deployed.
- A failed or sticking outrigger deployment switch that stays open or stuck low.
- Cabin mode having been the last valid operating mode when the platform station is activated, which affects whether engine start is permitted alongside the outrigger condition.
How to troubleshoot JLG Telehandler 2315: first checks
- Visually confirm all stabilizers/outriggers are actually fully deployed and contacting the ground before assuming a sensor problem.
- Inspect the outrigger deployment switches and their wiring at J7-7 and J7-20 for looseness, corrosion, or damage.
- Cycle the stabilizers and watch whether the switches actuate cleanly and consistently, with no intermittent dropout.
- Check which operating mode (cabin or platform) was last valid, since this affects whether engine start is blocked in addition to the stabilizer interlock.
- Note the current boom angle and any chassis tilt indication, since the controller's retrieval sequence for lift, telescope, and derated speeds depends on boom angle relative to 10° and on tilt sensor readings relative to absolute trip point 1 and trip point 2.
How the code clears
The fault latches until both J7-7 and J7-20 read high, meaning both outrigger deployment inputs must confirm a deployed state. No separate reset procedure is listed for this code beyond correcting the stabilizer deployment condition so both inputs go high.
Frequently asked questions
What does JLG fault code 2315 mean?
It means the platform station is active but the controller does not see the stabilizers/outriggers as properly deployed, based on inputs J7-7 and J7-20. It is an operating mode interlock fault, not a component failure code by itself.
Why won't the engine start when I get code 2315?
If the platform station is active and cabin mode was the last valid operating mode, the controller deactivates the engage starter output and will not permit engine start until the stabilizer condition and mode logic clear.
Why is telescope out blocked but lift down still works?
JLG's retrieval sequence inhibits telescope out until the boom retracted switch reads high, then permits lift down. Once boom angle drops below 10°, telescope out is permitted and lift up is allowed up to a boom angle of 10°.
Does chassis tilt make this fault worse?
Yes. If a chassis tilt condition is detected with the tilt sensor angle at or above absolute trip point 1 but below trip point 2, the retrieval functions still work but at derated speeds. At or above absolute trip point 2, telescope out is immediately inhibited.
How do I clear fault 2315?
Get both J7-7 and J7-20 inputs to read high, which typically means confirming the stabilizers are fully and properly deployed and that the switches and wiring for both circuits are functioning correctly. The fault latches until both inputs go high.
Is it safe to bypass this interlock to keep working?
No. This interlock exists specifically to prevent platform operation without properly deployed stabilizers. Bypassing switches or wiring to defeat it creates a serious tip-over risk.