Trouble code P0610 means: Control Module Vehicle Options Error
55 code is not an error code, it signals end of codes. If no other codes preceded it, you have no error codes.
The error code E 30 for a CAT sit down lift truck is not listed online. However, you can call any CAT dealer and they can give you the error code reasons.
Trouble code P0149 means:Fuel Timing error
Error code p0605 is related to the Transmission control module.
Trouble code P0344 means:Camshaft position circuit intermittent
Trouble code P0562 means:System voltage low
Random Misfire.
Cylinder #7 Misfire
INTAKE AIR TEMPERATURE SENSOR HIGH
Charging system voltage too low.
Gas cap is loose or needs replacing
Trouble code P0304 means:Cylinder 4 misfire detected