JLG Scissor Lift 11 Fault Code: Charge Air Temperature
Also called All Systems OK, Low Oil Pressure
Charge Air Temperature · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Code 11 (SPN 174 / FMI 2) on JLG M3369 and M4069 scissor lifts points to a sensor circuit fault in the charge air temperature or low oil pressure monitoring system. JLG lists the cause as a fault at the sensor entry, such as a short circuit or cable break. When the sensor fails, the related monitoring function shuts off, so the machine loses protection in that area until it's fixed.
High severity. This code disables an engine protection monitoring function (oil pressure or charge air temperature). While the machine may keep running, losing that monitoring means a real low oil pressure or overtemp event could go undetected. Diagnose before continuing normal operation.
What does JLG Scissor Lift error code 11 mean?
Fault code 11 corresponds to SPN 174 / FMI 2 and covers descriptions listed as 'All Systems OK', 'Charge Air Temperature', and 'Low Oil Pressure'. This grouping reflects how the code behaves across different sensor entries on the engine control system used in the M3369 and M4069 models.
JLG's diagnostic text places this under the Sensors fault group. The stated cause is a fault at the corresponding sensor entry, described as either a short circuit or a cable break. This is an electrical circuit integrity fault, not necessarily a fault with actual oil pressure or air temperature conditions.
Because the fault disables the associated monitoring function when the sensor fails, the controller cannot reliably tell you whether oil pressure or charge air temperature is actually within a safe range. One listed description confirms this can occur specifically as a shutdown due to low engine oil pressure, so the underlying system matters even though the fault itself is a sensor issue.
Common causes of 11
- Short circuit at the sensor's wiring or connector entry
- Cable break (open circuit) in the sensor's wiring harness
- Failed or degraded sensor itself, no longer sending a valid signal
- Sensor fault limits out of range, causing the controller to flag the reading as invalid
How to troubleshoot JLG Scissor Lift 11: first checks
- Inspect the sensor cable for visible damage, chafing, corrosion at connectors, or a broken conductor
- Check the sensor connector for secure seating and clean contacts
- Test the sensor itself and replace it if it fails inspection or bench testing
- Check the fault limits programmed for the sensor to confirm they match expected values
- If the description points to low oil pressure, treat it seriously: check actual engine oil level and pressure with a manual gauge if available, since the monitoring function may be disabled
How the code clears
No separate clearing step is listed. JLG's help steps are to check the sensor cable, check and replace the sensor if required, and check the fault limits for the sensor. Once the wiring or sensor issue is corrected, the fault should stop reporting on the next monitoring cycle. No reset procedure is listed for this code.
Affected models and serial ranges
11 appears in our records across 2 JLG Scissor Lift models. Match your machine by model and serial number.
| Model | Serial ranges |
|---|---|
| M3369 | Serial range not listed in source records |
| M4069 | Serial range not listed in source records |
Frequently asked questions
What does JLG fault code 11 mean on a scissor lift?
It means the controller detected a fault at a sensor entry tied to charge air temperature or low oil pressure monitoring, such as a short circuit or a broken cable. It falls under SPN 174 / FMI 2 in JLG's diagnostic system.
Is it safe to keep operating with fault code 11 active?
Not recommended. When this sensor fault is active, the associated monitoring function is de-activated, meaning the machine loses its ability to warn you about actual low oil pressure or high charge air temperature. Treat it as a high priority issue.
Which JLG models show fault code 11?
This code is listed for the M3369 and M4069 models.
Does fault code 11 always mean low oil pressure?
Not necessarily. The code covers a group of descriptions including 'All Systems OK', 'Charge Air Temperature', and 'Low Oil Pressure'. The common thread is a sensor circuit fault, and one specific description notes a shutdown due to low engine oil pressure, so the actual condition depends on which sensor and situation triggered it.
How do I fix fault code 11?
Check the sensor cable for damage, check the sensor and replace it if it fails testing, and check the fault limits set for that sensor. These are the three steps JLG lists to resolve this fault.
Will fault code 11 clear itself after repair?
No separate clearing or reset procedure is listed. Once the sensor cable or sensor problem is corrected, the fault should stop being reported during normal monitoring.
What's the difference between a short circuit and a cable break for this code?
A short circuit means the wiring is contacting something it shouldn't, sending an invalid signal. A cable break means the circuit is open, no signal is getting through at all. Both are listed by JLG as possible causes of this sensor fault.