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FIXITMAN, Master Technician
Category: GM
Satisfied Customers: 17368
Experience:  ASE Master Certified
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2004 gmc: the diagnostic port..signal..even light

Resolved Question:

the diagnostic port on my 2004 gmc denali is not sending a signal or code at all. No reading, no power. A shop got an error, my reader didn't even light up? please tell me where there is a fuse or loose connection, it worked a month ago just fine, hasn't been touched since. going to the gmc shop is an automatic toooooooo much money. thanks
Submitted: 7 years ago.
Category: GM
Expert:  FIXITMAN replied 7 years ago.
HelloCustomer you need to check the fuse under the hood labeled CIGAR. This fuse powers the data link connector. Let me know what you find.
FIXITMAN and 4 other GM Specialists are ready to help you
Customer: replied 7 years ago.
You sir, are the master. Thanks for the good honest direction!