Yea, shocked the hell outta me too. had it unplugged, tried to drive to work and my DIC read something like limited power. pulled battery, reconnected, and still it said the same thing and would not let me go anywhere past maybe 10mph. it wasnt until, after trying a ton of other lil resets n checks etc that i thought maybe since the gmlan runs through the radio..and the whole thing bout having to have the right serial/vin etc for it to work in a 03-05 gm made me think maaaybe the radio had something to do with it. plugged it in, and started right up, no problems or anything. confused the **** outta me and still sorta does. what in my radio does the GMLAN need a signal from in my radio to run correct? Crazy stuff.. maybe ill try again here soon since most of my dash and my console are out and try and figure something out. I couldnt do too much at the time bc I was runnin late for work, and there was no way in hell I could drive 10mph the whole way there. Im in Tulsa btw.. and thanks bud, but I do ALL my own installs... it takes me a while due to lack of free time, but at least I trust my work and know who to blame when something goes wrong haha- Nothing against you but I cant stand to have other folks do my installs n repairs unless its something Im unsure of how to do it...or if its rebuilding an auto trans.. bc f.that.. swap it hah. So NO ONE has heard of that happening to anyone else before? If it makes a diff, its an 03, z71 w bose, no dvd, no onstar (least that im aware of or can find its module or connection to ANYTHING) Its bein a bastard at the moment w electrical issues too, if anyone can gimme a bit of knowledge... the abs wheel speed sensors are actin funny, but only if i hit a bump...im plannin on replacing them on this next brake job though...Also if I dont drive it within 3 or so days the batt goes dead.. replaced the batt w optima n the alt w a 200a...still...same issue, but shows no drain on a circuit check/load test w/e..? it beeps at me for no reason randomly like a check eng light or somethin is goin off...but its not.. and now my TPS sensor has shown a fault but only once...never came back up again but runs sorta off since then. any suggestions or input would be nice. N thanks for the info thus far. Once I figure out the electrical prob, im installing my amps n stuff. Ill post a write up n pics, im thinkin of goin a bit bigger than my usual builds, soo might be interesting... although I might have to keep the stupid delco connected n in the dash for a while n just bypass that whole mess for now.