JLG Scissor Lift 25 Fault Code: Elev Angle Sensor Has Not Been Calibrated
Also called Drive and Lift Up Prevented, Elev Angle Sensor Faulty - Not Mounted or Voltage Out of Range, Elev Angle Sensor Not Detecting Change, Elevation Prox Switch Permanently Closed, Elevation Prox Switch Permanently Open, Front Left Leveling Jack Pressure Transducer Failure, Front Left Leveling Jack Stow Switch Permanently Closed, Front Right Leveling Jack Pressure Transducer Failure, Front Right Leveling Jack Stow Switch Permanently Closed, Function Prevented Due to a Cutout, Function Problems, Indicates That a Function is Prevented Due to a Cutout - Drive & Lift Prevented - Brakes Electrically Released for Towing, Indicates That a Function is Prevented Due to a Cutout - Drive & Lift Up Prevented - Charger Connected, Indicates That a Function is Prevented Due to a Cutout - Drive Prevented - Brakes Not Releasing, Indicates That a Function is Prevented Due to a Cutout - Drive Prevented - Charger Connected, Indicates That a Function is Prevented Due to a Cutout - Drive Prevented - Elevated Above Drive Cutout Height, Indicates That a Function is Prevented Due to a Cutout - Drive Prevented - Pot-Hole Not Engaged, Indicates That a Function is Prevented Due to a Cutout - Elev Angle Sensor Faulty - Not Mounted or Voltage Out of Range, Indicates That a Function is Prevented Due to a Cutout - Elev Angle Sensor Has Not Been Calibrated, Indicates That a Function is Prevented Due to a Cutout - Elev Prox Permanently Closed - Check Prox and Angle Adjustment, Indicates That a Function is Prevented Due to a Cutout - Model Changed - Hydraulics Suspended - Cycle EMS, Indicates That a Function is Prevented Due to a Cutout - Platform Overloaded, Over Maximum Map Sensor Temperature, Platform Overload, Rear Left Leveling Jack Pressure Transducer Failure, Rear Left Leveling Jack Stow Switch Permanently Closed, Rear Right Leveling Jack Pressure Transducer Failure, Rear Right Leveling Jack Stow Switch Permanently Closed
Elev Angle Sensor Has Not Been Calibrated · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Code 25 on JLG scissor lifts covers a group of function cutout conditions tied mainly to the elevation angle sensor, elevation proximity switch, pot-hole protection, and platform overload system. When active, the controller blocks drive, lift, and sometimes steer to keep the machine from operating in an unsafe or unverified state.
High severity. Code 25 stops key functions (drive, lift, steer) on purpose as a safety cutout. It is not an emergency shutdown of the whole machine, but it will keep the unit from moving or elevating until the underlying sensor, switch, or overload issue is resolved.
What does JLG Scissor Lift error code 25 mean?
Code 25 is really a family of related messages that all point to the same root idea: the JLG control system will not allow drive, lift up, or sometimes steer, because it cannot confirm the platform's true position, tilt state, load, or pot-hole protection status. Rather than guess, the controller cuts out the function to protect the operator and machine.
Most of the underlying causes trace back to the elevation angle sensor and elevation proximity switch disagreeing with each other, or the elevation sensor not being calibrated. Others relate to the pot-hole protection mechanism not deploying, or the platform load sensing system detecting an overload.
Because these are conservative safety cutouts, the machine defaults to assuming it is elevated, tilted, or overloaded whenever the sensors disagree, which restricts drive speed or blocks functions entirely until the conflict is resolved.
What triggers a JLG Scissor Lift 25 code?
The controller sets specific variations of this cutout under these measured conditions: the elevation sensor is called healthy and its zeroed voltage is below 0.04 volts while the elevation prox switch is open for 2000 milliseconds, or the elevation sensor is healthy and its zeroed voltage is above 0.15 volts while the elevation prox switch is closed for 2000 milliseconds. For pot-hole related cutouts, in platform mode with a healthy elevation sensor the voltage is above 0.15 volts while the pot-hole protection switches detect up, or with an unhealthy sensor the elevation prox sensor is open while the pot-hole switches detect up.
Common causes of 25
- Elevation sensor calibration EEPROM still holds the in-circuit test fixture signature and has never been overwritten by a valid calibration
- Platform height is assumed to be at full elevation by default when sensor data is unreliable
- Elevation proximity switch is open (indicating elevated) while the elevation sensor voltage indicates stowed, causing the system to conservatively assume elevated
- Elevation proximity switch is closed (indicating stowed) while the elevation sensor voltage indicates elevated, causing the system to assume elevated and restrict drive speed
- Pot-hole protection mechanism failed to deploy while elevated, detected through PHP switches reading up combined with elevation sensor or prox switch state
- Platform load sensing system detects an excessive load while the load sensing system is enabled and machine setup is configured to cut out platform or all functions
- Physical obstruction blocking the pot-hole protection mechanism, a mechanical failure in that mechanism, or misadjusted pot-hole limit switches
- Wiring faults affecting the elevation sensor, elevation proximity switch, or pot-hole protection switches
How to troubleshoot JLG Scissor Lift 25: first checks
- Check the elevation proximity switch and elevation angle sensor wiring and connectors for corrosion, looseness, or damage
- Verify whether the elevation angle sensor has ever been calibrated; if not, run the calibration procedure
- Inspect the pot-hole protection mechanism for physical obstructions or mechanical failure, and confirm the limit switches are adjusted correctly
- Check the platform for excess weight if an overload-related message is present, and remove weight as needed
- Confirm machine setup configuration for load cutout mode (platform only or all functions) matches the intended operation
- Test elevation sensor voltage against the elevation prox switch state to see if they agree with each other
How the code clears
For elevation sensor and proximity switch related causes, calibrate the elevation angle sensor using the proper calibration procedure to clear the message. For pot-hole protection causes, clear the obstacle blocking the mechanism, repair any mechanical problem, re-adjust the pot-hole limit switches, or repair the wiring. For overload causes, remove excess weight from the platform. No separate reset procedure beyond these corrective actions is listed for this code.
Frequently asked questions
What does JLG fault code 25 mean?
It means the machine has activated a function cutout, most often preventing drive and lift up, because the elevation angle sensor, elevation proximity switch, pot-hole protection system, or platform load sensing system detected a condition it cannot safely proceed with.
Why is my JLG scissor lift not allowing drive or lift up?
The control system defaults to blocking these functions when it cannot confirm platform position or load status. This can happen if the elevation sensor and proximity switch disagree, the pot-hole protection mechanism has not deployed, or the platform is overloaded.
Do I need to calibrate the elevation sensor to fix code 25?
In many cases yes. If the elevation sensor has never been calibrated, or its calibration EEPROM still holds the factory test signature, running the calibration procedure is the listed fix.
Can an overloaded platform cause this fault?
Yes. If the load sensing system detects an excessive platform load and the machine is configured to cut out platform or all functions, drive, steer, and lift are prevented until the excess weight is removed.
What is pot-hole protection and why does it block driving?
Pot-hole protection is a mechanical safety device that deploys when the platform is elevated to prevent the machine from driving into a hole or drop-off. If it fails to deploy, or its switches do not register correctly, the controller blocks drive and steer as a safety measure.
Is code 25 dangerous to keep operating through?
The cutout itself is a safety feature, not a failure of the whole machine, but ignoring it means working around a sensor or mechanical issue that the manufacturer wants resolved before functions are restored. It should be diagnosed before continuing normal operation.
How do I clear code 25 after fixing the problem?
Depending on the cause, you calibrate the elevation angle sensor, clear and repair the pot-hole protection mechanism or its wiring, or remove excess weight from the platform. No separate reset procedure beyond these corrective steps is listed.