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I haven't checked the DLC connector yet, but the fuse was blown. I replaced it and I hope to get that code read in the next couple of days. Thanks again for the help.

I will check that tonight. Thanks for the quick response.

Not sure if this belongs here or not. If not please redirect me. I have an '03 Yukon XL with the 5.3. The check engine symbol has been illuminated for several months now. I tried to read the codes at the local parts house but the device doesn't seem to make a connection. You plug it in...