No communication with ecu or body builder module.

That was minor!

Works out to an expensive little fuse!

I went to a machine fault a few years ago, faulting while under load. Told the operator to change the main fuse, he said no its fine!
I drove 4 hours, opened the excavator side door, told him to fire the machine up.

Blue glow from fuse... Spray of CRC, fit new fuse to replace corroded one... Drove home 4 hours and submitted the bill.

Its easy to miss the complicated simple things....

Could have been worse... Computers and welding........