Dropped of my 2007 tahoe in for a 2 service issues that came up on the DIC. The dealer is charging $120 diagnostic charge for each issue. when asked why i'm gettign charge twice for hooking truck up to the same computer the response was "its two different diagnostic flow diagrams that the tech needs to follow". talk about highway robbery. I even gave him the codes and what diagnostic steps i have tried already for one of the issues. no wonder why people i not buying these trucks and or chevy cars anymore.