Probably fixed this but for future reference. Models 1b1, 1b2, a1n1
Code 444 can come from either a defective meter panel or a defective controller. Do Not swap parts with a known good truck to test as you have a 50/50 chance of swapping the wrong component.

A defective meter panel or controller with code 444 will rewrite the good controller or meter panel.

Test point for this code is on the traction controllers.
Connector 2 pin 12
Connector 2 pin 23 (should be an empty hole with no wire)
Infinity resistance between the two pins.