I've been trying to connect to my wife's 04 V6 Envoy and it won't recognize the pcm. All I'm trying to do is read codes. Getting very frustrated. Tried Autotap and old cable, tried V5, V6, and V7 with EFI Live V1 cable and it won't show me any codes. When I hook it up to my new 07 GMC Sierra it won't do anything either. Granted it has been a couple of years since I tried to use these programs but I spent hours today just trying to connect and I've never had these problems trying to scan a vehicle. When I connected autotap to my corvette, it started reading the pcm right away. Any help greatly appreciated.
Nick