I am totally honest when I say, this truck is 100% stock, no exhaust, no CAI, no stereo (other than factory) All the power is turned off in side. door closed. All is done with the exception of the parking brake...and nothing happens.

Already tried programmer on 2008 SS Impala, no problems, but it seems that on this vechicle it won't connect. this also happened on a 2004 Escalade...Any thoughts?