quite a few things can cause the code 30
Possible Causes:
Faulty pump motor circuit
faulty line contactor
faulty regeneration contactor
faulty D1P diode
faulty pump motor wiring
faulty head capacitor
faulty T1P IGBT
faulty CS3 current sensor
faulty wiring in other parts
faulty logic card
faulty drive board

Error Code 60 (Data Communication Abnormality)
Possible Causes:
Faulty Display
Faulty Wiring
Faulty Logic Card

If you can get the truck to run good for a minute or two...

things i would certainly check and MAKE SURE are ok are the battery, make sure it is fully charged, run a load test on it running the hydraulics and make sure no cells are failing causing steep voltage drops. Make sure the fluid level is up above the cell plates.