JLG Telescopic Boom Lift 10 Fault Code: Charge Air Temperature
Also called Running at Cutback - Out of Transport Position
Charge Air Temperature · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Fault code 10 (SPN 105 / FMI 2) means the JLG telescopic boom lift has limited drive speed to a programmed maximum because the machine is not in transport position: main boom retracted and boom angle less than 4-15.0° (default) from gravity. It can also be triggered by a sensor fault that de-activates the associated monitoring function.
Medium severity. This code is mostly informational, the machine keeps working but at reduced drive speed. It becomes more important if it appears when the machine actually is in transport position, since that points to a sensor or wiring fault rather than normal cutback behavior.
What does JLG Telescopic Boom Lift error code 10 mean?
Fault code 10 tells you the machine's controller has detected that the boom is not in transport position, so it is limiting drive speed to a programmed maximum (an elevated max cutback speed) rather than allowing full travel speed. Transport position by default means the main boom is fully retracted and the boom angle is less than 4-15.0° from gravity.
This is a normal, expected behavior when the boom is raised or extended: the machine slows itself down for stability while driving. However, the same code can also be set if a related sensor has failed. When that happens, the monitoring function tied to that sensor is de-activated, which can cause the cutback logic to trigger even when the machine appears to be in transport position.
In short, code 10 by itself is not necessarily a malfunction. It becomes a diagnostic concern when the drive speed limitation does not match the actual physical position of the boom, or when it appears alongside sensor circuit issues like a short or open cable.
Common causes of 10
- Boom is genuinely out of transport position (not fully retracted, or boom angle at or above the 4-15.0° default threshold from gravity), which is expected normal operation.
- Fault at the corresponding position sensor's circuit, such as a short circuit or a cable break (open circuit).
- Sensor failure that de-activates the associated monitoring function, causing the controller to read or assume an out-of-transport condition even if it is not accurate.
How to troubleshoot JLG Telescopic Boom Lift 10: first checks
- Confirm the actual physical position of the boom: is the main boom fully retracted and is the boom angle below the 4-15.0° default threshold? If yes and the code still shows, suspect a sensor or wiring fault rather than normal cutback.
- Inspect the sensor cable for the boom angle/position sensor for visible damage, chafing, corrosion at connectors, or loose pins.
- Check the sensor itself for proper function and replace it if it fails inspection or testing.
- Review the programmed fault limits for the sensor to confirm they match expected values for transport position detection.
How the code clears
No separate clearing step is listed for this code beyond correcting the underlying condition. If the code is set because the boom is genuinely out of transport position, it should clear once the main boom is fully retracted and the boom angle drops below the default threshold. If a sensor fault is the cause, clearing depends on repairing or replacing the sensor cable or sensor and confirming fault limits are set correctly.
Frequently asked questions
What does JLG fault code 10 mean?
It means the drive control system has limited the machine's drive speed to a programmed maximum (elevated cutback speed) because the boom is not in transport position: main boom retracted and boom angle less than 4-15.0° (default) from gravity.
Is fault code 10 dangerous to keep operating with?
Not inherently. It is largely informational, describing an active speed limitation. It is worth investigating further if it appears while the boom actually is in transport position, since that suggests a sensor or wiring problem.
Why is my JLG boom lift driving slower than normal?
If the main boom is not fully retracted or the boom angle is above the default threshold from gravity, the controller intentionally limits drive speed for stability. This is exactly what fault code 10 reports.
What sensor is associated with fault code 10?
The position/angle sensor used to detect transport position (main boom retraction and boom angle relative to gravity). A short circuit or cable break in this sensor's wiring can trigger the fault.
How do I troubleshoot fault code 10 on a JLG boom lift?
Check the sensor cable for damage or corrosion, check the sensor itself and replace if it fails testing, and check the programmed fault limits for that sensor to confirm they are correct.
Will fault code 10 clear itself?
If it is caused by normal out-of-transport driving, it should clear once the boom returns to transport position (fully retracted, angle below the default threshold). If a sensor fault is causing it, the code will persist until the cable or sensor issue is repaired.
What happens if the sensor tied to this fault fails?
When the sensor fails, the monitoring function associated with it is de-activated, which can affect how reliably the controller detects true transport position and may cause unexpected cutback behavior.