JLG ES series scissor lifts (1930ES, 2030ES, 2630ES, 2646ES, 3246ES)
JLG error code 661 — CANBUS FAILURE - POWER MODULE
Message on the display: CANBUS FAILURE - POWER MODULE
Code 661 occurs in machines: JLG ES series, 1932RS, 6RS, 3248RS, 10RS, 4045R, R4045.
blocking fault
The control system failed to receive messages from the power module.
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
- Check for 24V between power module 12 position connector terminal 1 and the power module B- terminal. If this is the problem, the line contactor may be cycling on and off, making a clicking noise when the machine is powered.
- Disconnect ground board J1 and power module connector. Ground board socket J1-31 to power module connector socket 10 should have continuity. Ground board socket J1-32 to power module connector socket 11 should have continuity.
- Turn on machine in platform mode. If DTC 662 is present, troubleshoot that DTC before continuing.
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 661 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.