truck has 214000 miles autotrans 350 v8, and the codes are u1192 u1041 loss comm. for the passlock and the brake control modual. and o2 codes are po141 and po161 for the heater circuits. i have a gm book, everything i check out basicly comes back the wire, but everything also seems fine. its kinda crazy cuase i decided to look into the transfer case modual conector and the wire isnt there, the one that conecks all them together, the book shows the conecktor, and the schimatic. it doesnt look like its bing ripped out, still factory tape there. fuel pressure goes up to spec. then drops off, so i think that proves that its bing shut off. but i thought vcm just doesnt operate the fuel modual. also i think there are some typos in the book. the book also said it was intermit, because the codes didnt come back after i cleared them. thanks for your help. if you need more info let me know. mx:banghead: