JLG boom lifts (450AJ, 600AJ, 800AJ, 460SJ, 660SJ, 860SJ, 1250AJP, M450AJ, M600JP)
JLG error code 99281 — FUNCTIONS LOCKED OUT - IMPROPER MOTOR PARAMETERS
Message on the display: FUNCTIONS LOCKED OUT - IMPROPER MOTOR PARAMETERS
Code 99281 occurs in machines: JLG M600JP, E600JP.
blocking fault
The UGM determines an incorrect protected Indirect Table value at start-up
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
- Power cycle
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 Manuals: 600AJ (3121201), 800AJ (3120858), 460SJ, 860SJ, 1250AJP (3122581800), M450AJ (3121829), M600JP (3121711), Diagnostic Trouble Codes tables.
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 99281 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.
Neighbouring JLG codes
- 99270REAR RIGHT MODULE - DRIVE COMMAND ERROR
- 99273FUNCTIONS LOCKED OUT - REAR LEFT MODULE SOFTWARE VERSION IMPROPER
- 99274FUNCTIONS LOCKED OUT - REAR RIGHT MODULE SOFTWARE VERSION IMPROPER
- 99282GROUND DISPLAY SOFTWARE VERSION IMPROPER
- 99285LSS - FACTORY CALIBRATION ERROR
- 99296PLATFORM DISPLAY SOFTWARE VERSION IMPROPER