JLG boom lifts (450AJ, 600AJ, 800AJ, 460SJ, 660SJ, 860SJ, 1250AJP, M450AJ, M600JP)
JLG error code 9923 — GROUND MODULE FAILURE - HWFS CODE 1
Message on the display: GROUND MODULE FAILURE - HWFS CODE 1 · flash code 9/9
Code 9923 occurs in machines: JLG 860SJ, 800S, 600AJ, 600S, 660SJ, 800AJ, 800A, 460SJ, 400S, 1250AJP, 1100S, 1100SJP, 340AJ, 450AJ SII, 510AJ, 600SC, 600SJC, 660SJC.
blocking fault
The Ground Module has reported that the V(Low) FET has failed.
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.
What you can do
Switch the machine off with the emergency stop and switch it on again. If the code comes back, do not use the machine and call service.
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 9923 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
- 9920PLATFORM SENSOR REF VOLTAGE OUT OF RANGE
- 9921GROUND MODULE FAILURE - HIGH SIDE DRIVER CUTOUT FAULTY
- 9922PLATFORM MODULE FAILURE - HWFS CODE 1
- 9924FUNCTIONS LOCKED OUT - MACHINE NOT CONFIGURED
- 9925FUNCTIONS LOCKED OUT - CHASSIS MODULE SOFTWARE VERSION IMPROPER
- 9926FUNCTIONS LOCKED OUT - BLAM MODULE SOFTWARE VERSION IMPROPER