I do remember having issue's with the dash clusters on some trucks but I cant remember what years but I think it included your year. The Front Control module is under the hood. The trucks at first called their Body Control module a Central Timner module as its inside the truck like the Body Control module. Then on the newer ones the cluster took over the Central Times functions. But from the code you said it sounds like the bus is down. It could be from the cluster but could also be many other things. You need to get a DRBII on it and monitor the bus circuits and the bus voltage and then go from there. It could be the cluster causing all the problems as I believe the cluster on yours is the Body Control module. But of course it could be other problems also. If you can get the right scanner like the DRBII on it then it can be diagnosed using the scanner and the driveability book. Ron