The computer port on my GMC truck does not work. Can't read codes, code reader says "No power!"
The check engine light is on my 2003 GMC. The computer port inside the truck has no power to it. Is there a fuse on this circuit or was that optional equiptment on my base model truck? It has a 4.3L V6
There is a fuse and many times it is the cig. lighter (power port) fuse.
Thanks for your help. My cig lighter won't work either, so maybe that is the reason. Thanks again!
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