data link communication system port is not working ...

Question: My data link communication system port is not working in my 2003 Chevy Silverado pickup. I bought a code reader from Harbor Freight, and it didn''t pick up any codes, but did on my wife's car. Took the reader back, and went to Auto Zone. They offered to read the codes, but their reader wouldn't work either. Answer: You will want to check the radio and cigar lighter fuse. If they are blown, it will not receive a signal through the data connector.