JLG ES series scissor lifts (1930ES, 2030ES, 2630ES, 2646ES, 3246ES)
JLG error code 257 — ELEV PROX PERMANENTLY CLOSED - CHECK PROX AND ANGLE ADJUSTMENT
Message on the display: ELEV PROX PERMANENTLY CLOSED - CHECK PROX AND ANGLE ADJUSTMENT
warning / function limited
The elevation proximity switch shows the platform to be stowed, while the elevation angle sensor shows the platform to be raised. The elevation proximity switch is only found on certain older lifts. This switch is not used on current machines so this DTC should not occur.
Description from the JLG service manual, in the original wording.
Possible causes
The manual does not list the causes for this code: the service technician establishes them during diagnosis of the machine.
Checks from the manual
- Verify that an elevation proximity switch is present on the machine. If not, ensure ANALYZER -> MACHINE SETUP -> ELEV PROX is set to NOT INSTALLED. If the switch is present, set ELEV PROX to INSTALLED and check switch continuity. The switch should close when placed in close proximity to ferrous metal.
What service does
A qualified service technician reads the code with the manufacturer's diagnostic tools, finds the cause, clears the code and carries out a function test.
Source: JLG Service and Maintenance Manual, ES series (Diagnostic Trouble Codes section).
The descriptions are quoted from the manufacturer's service documentation and are for guidance only. Clearing codes, calibrations and repairs are carried out by a qualified service technician according to the manual for the specific serial number. A machine with an active blocking code must not be used until the cause has been removed.
Does code 257 not go away?
RK Rental services JLG lifts at our workshop or on site at the customer's premises (construction site, factory, warehouse). We read the code, remove the cause and select the parts by serial number.