My truck shutdown on me while driving and "no bus" came up on the odometer. I was able to get it running long enough to get it home and it's never started since. That was 4 months ago. The truck will crank but will not start. A scanner can't connect to the computer. The codes that come up on the odometer are 920, 921, and 999. I have since replaced the PCM, checked every wire connector, cleaned all grounds, and checked voltage. Nothing. I have found that all power is staying between the Battery and Fuse box. I can not, for the life of me, figure out why power is not being pushed out. I need some serious help with this No Bus code. I am tired of my truck being down.