JLG Telescopic Boom Lift 32 Fault Code: Charge Air Temperature Warning
Also called Contactor Did Not Open When Energized, Contactor did not Open when Energized, Contractor Did Not Open When Energized, Heated Oxygen Sensor (HO2S) Low Voltage
Charge Air Temperature Warning · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Fault code 32 on JLG telescopic boom lifts (flash code 3-2, SPN 105 / FMI 0 on E600 models) covers more than one condition depending on the system: a charge air temperature warning on the engine side, or a line contactor that failed to open when energized on the electrical/drive side. Both are functional warnings that call for inspection before continued operation.
Medium severity. This is listed as a functional fault warning with no priority assigned for the contactor version, and a delayed time-fill limitation for the charge air version. It is not flagged as an immediate shutdown code, but a welded contactor condition is a real safety concern because the controller cannot switch off power through the normal EMS or key switch path.
What does JLG Telescopic Boom Lift error code 32 mean?
Fault code 32 has two distinct meanings depending on which JLG system and engine reports it. On E600-equipped machines it can mean the charge air temperature has exceeded its warning level, tracked under SPN 105 / FMI 0. On other systems, flash code 3-2 means a contactor did not open when it was commanded to energize (actually meant to de-energize and open).
In the charge air version, this is a functional warning tied to the intake air temperature circuit. The fault message will disappear on its own once the charge air temperature drops below the recovery level, but there is a delay before normal time-fill operation resumes.
In the contactor version, the concern is a welded line contactor. If the contactor is welded shut, the controller cannot switch off machine power when the EMS (emergency stop) or key switch is turned off. JLG notes this can happen because the capacitor bank charge did not decrease from battery supply when the line contactor was de-energized, possibly due to a power wiring error.
What triggers a JLG Telescopic Boom Lift 32 code?
For the charge air version, the fault sets when charge air temperature exceeds the warning level, and clears when temperature drops below the recovery level after a delay time-fill limitation. For the contactor version, the fault sets when the capacitor bank charge does not decrease from battery supply after the line contactor is de-energized, indicating the contactor stayed closed (welded) instead of opening.
Common causes of 32
- Charge air temperature has exceeded the warning level (engine intake air running too hot).
- A faulty charge air temperature sensor or damaged sensor cable giving a false high reading.
- A welded (stuck closed) line contactor that will not open when it is supposed to de-energize.
- A power wiring error that prevents the capacitor bank charge from decreasing when the line contactor is de-energized.
How to troubleshoot JLG Telescopic Boom Lift 32: first checks
- Check the charge air system itself for restrictions, cooling problems, or anything that could be driving intake temperature up.
- Inspect the charge air temperature sensor and its cable for damage, loose connectors, or corrosion.
- With the machine safely shut down and locked out, inspect the line contactor for visible signs of welding or sticking contacts.
- Check the power wiring around the line contactor and capacitor bank for wiring errors, loose connections, or damage.
- Verify capacitor bank charge behavior when the line contactor is de-energized, confirming whether it decreases as expected.
How the code clears
For the charge air temperature version, the fault message clears on its own once charge air temperature drops below the recovery level, though there is a delay time-fill limitation before full function returns. No separate clearing step is listed for the contactor version, since it flags a hardware condition (a welded contactor) that must be physically inspected and corrected rather than reset through the controller. Select the specific engine from the list on JLG's diagnostic interface for further engine-specific code information.
Affected models and serial ranges
32 appears in our records across 1 JLG Telescopic Boom Lift models. Match your machine by model and serial number.
| Model | Serial ranges |
|---|---|
| E600 | Serial range not listed in source records |
Frequently asked questions
What does JLG fault code 32 mean?
It depends on the machine and system. On E600 models it can indicate a charge air temperature warning (SPN 105 / FMI 0). On other systems, flash code 3-2 means a contactor did not open when it was energized to open, most often pointing to a welded line contactor.
Is fault code 32 safe to keep operating with?
It is a functional warning rather than an automatic shutdown, but a welded contactor means the controller cannot switch off power through the normal EMS or key switch. That is a safety-relevant condition and should be inspected before continued use.
Why does the fault message disappear on its own sometimes?
For the charge air temperature version, the fault clears automatically once the charge air temperature drops below the recovery level. There is a delay time-fill limitation afterward before normal operation resumes.
What is a welded line contactor and why does it matter?
A welded contactor is one whose contacts have fused or stuck closed so it cannot open when de-energized. This means the machine controller cannot fully cut power via the EMS or key switch, which is a safety hazard.
What should I check first if I get code 32?
Check the charge air system and its temperature sensor and cable for the engine-related version. For the contactor-related version, inspect the line contactor and surrounding power wiring for welding or wiring errors.
Does fault code 32 require an engine-specific lookup?
Yes. JLG's diagnostic guidance notes to select the specific engine from a list for further information, since the charge air temperature warning applies specifically to E600-equipped machines.