ok guys i have a serious question...my 04 denali was driving just fine then yesterday the check engine light came on..its been driving kinda weird so i took it to autozone to get the computer checked so i could get an idea if what was wrong..anyway now the obdII port doesnt have any power.?? im so confused anyone have any opinons? i checked all the fuses and the cigarette lighter has power..

 

Does your vehicle have more then 1 lighter? The wiring diagram says it get its power from the lighter fuse located under the hood? Are you sure its not the ground that missing instead of the power?

 

happened to my buddies d-max...turned out to be the cig. lighter fuse...

 

yea it has like 3 or 4 lighters ok ill check under the hood thanks!!!!