what is the serial number prefix?
there are many of these models that could have the old ev zx panel or the AC controls.
but like brewski said, if it is an older truck with an ev panel then -93 is brush wear sensor code, whatever OEM engineering assigned this code to is the motor brushes for one of the motors, most likely steer motor or hydraulic motor.
I checked the AC status code chart and there is no -93 listed.
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