JLG Scissor Lift 223 Fault Code: TPS 2 Signal High Voltage
Also called Function Problem - Drive & Lift Active Together
TPS 2 Signal High Voltage · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Code 223 (SPN 520251 / FMI 3) on JLG scissor lifts covers two distinct fault descriptions: a function conflict where drive and lift inputs are closed at the same time in platform mode, and a TPS 2 signal high voltage condition. JLG's own troubleshooting steps for this code focus on the drive/lift switch and its wiring to the platform board.
Medium severity. This code stops normal drive or lift function until the conflicting input or wiring issue is resolved, but it is not an immediate safety emergency by itself. Treat it as a stop-and-diagnose issue before returning the machine to service, since it involves the switch that separates drive and lift commands.
What does JLG Scissor Lift error code 223 mean?
Fault code 223 is tied to two separate description strings from JLG: 'Function Problem - Drive & Lift Active Together' and 'TPS 2 Signal High Voltage.' Both share the same SPN 520251 / FMI 3 identifier, which suggests the controller sees this as one logical fault path even though the plain-language description covers two symptoms.
The main documented condition is that the drive and lift inputs are closed simultaneously while the machine is in platform mode. In a scissor lift, drive and lift are supposed to be mutually exclusive selections made through a single switch: you are either telling the machine to drive or to lift, never both at once. If the platform board sees both inputs active together, it flags this as a function conflict and will not allow either function to proceed normally, since running drive and lift together is not a state the machine is designed to handle safely.
The TPS (throttle/transducer position sensor, exact function not detailed beyond its label) reference in the second description ties a high-voltage signal condition to the same fault number, but JLG's check steps focus entirely on the drive/lift switch and wiring, not on a separate TPS sensor procedure.
Common causes of 223
- Drive/lift selector switch has failed internally, closing both drive and lift contacts at the same time instead of just one.
- Physical damage to the switch (cracked housing, stuck plunger, worn contacts) causing it to bridge both outer posts to the center post simultaneously.
- Wiring fault between the drive/lift switch and the platform board (chafed, pinched, or shorted wiring) that causes both the J1-9 (lift) and J1-10 (drive) outputs to read active at the platform board input (J1-11) at the same time.
- Platform board internal fault that misreads the switch state as both functions selected together.
How to troubleshoot JLG Scissor Lift 223: first checks
- Inspect the drive/lift switch for visible damage such as cracks, corrosion, or a plunger that does not return fully.
- With power removed, check switch continuity: there should only be continuity from the center post to one of the outer posts at any given time. If both outer posts show continuity to the center post at once, or continuity is inconsistent, the switch has failed and needs replacement.
- Check the drive/lift switch signal and wiring back to the platform board. Confirm the input at platform board terminal J1-11 and the two selection outputs: 'Lift' selection at J1-9 (0V when selected) and 'Drive' selection at J1-10 (0V when closed). Look for wiring that could be shorting these two outputs together.
- If the switch and wiring check out clean and the fault persists, replace the platform board, since JLG lists this as the final step when switch and wiring are confirmed good.
How the code clears
No separate clearing step is listed. Once the drive/lift switch and its wiring are confirmed good (or replaced) and the platform board correctly reads only one function selected at a time, the fault condition should not re-trigger. No reset procedure beyond correcting the fault condition is listed for this code.
Frequently asked questions
What does JLG fault code 223 mean on a scissor lift?
It means the platform board detected the drive and lift inputs closed at the same time while in platform mode, or a related TPS 2 signal high voltage condition under the same SPN 520251 / FMI 3 code. In practical terms, the drive/lift selector switch or its wiring is telling the machine to do both drive and lift at once, which the controller will not allow.
Can I keep operating the scissor lift with code 223 active?
You should not continue operating normally until the conflict is resolved. If the machine thinks drive and lift are both selected, it may restrict or disable both functions rather than risk running them together, so continued operation attempts can leave you without reliable control.
How do I test the drive/lift switch for this fault?
With power removed, check continuity from the switch's center post to each outer post one at a time. Only one outer post should show continuity to the center post at any given moment. If both show continuity together, or the readings are inconsistent, the switch is faulty and should be replaced.
Is code 223 an electrical problem or a switch problem?
It can be either. JLG's checks start with the physical switch and its continuity, move to the wiring between the switch and the platform board (terminals J1-9, J1-10, and J1-11), and end with the platform board itself if the switch and wiring test good.
What is the TPS 2 part of code 223 about?
The second description tied to this code is 'TPS 2 Signal High Voltage.' No separate detailed procedure for the TPS 2 signal is given beyond the shared code number, so the practical troubleshooting path documented is the drive/lift switch and wiring check.
Do I need to replace the platform board for code 223?
Only replace the platform board after confirming the drive/lift switch and its wiring to J1-9, J1-10, and J1-11 are all good. JLG lists platform board replacement as the last step, not the first thing to try.