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Your answer helped me tremendously as I was able to pinpoint my problem. It was the cigarette lighter fuse that was causing my OBDII scanner to not communicate with my vehicle; although this fuse is actually located in the fusebox under the hood in my 2004 Tahoe. Thank you for your answer and I really appreciate it!Sounds like your cigarette lighter fuse is dead, it is among a triangular cluster, on the drivers side, closest to the windshield.