Sounds like a EV100 truck. Is the code flashing or is it solid lit?

thanks for the info.

The Serial Number is A216A03127V, YOM 1998

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.

If this is a SCR controlled truck, -93 is a warning for the power steering motor brushes.