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2002 GMC Sierra 1500 Question: Service engine light is on most of the time. Tech finds nothing wrong.

 

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loyal gmc owner, Siloam Springs, AR, October 30, 2012, 09:39
 Rookie

Service technicians have checked repeatedly and find nothing wrong.

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  • Answer #1

    Greg's Orange Auto (13627 Answers) , Orange, CA - (714) 361-9386
    globalhelper October 30, 2012, 12:37
     Master

    if the light is on there has to be a code.poss need a better scanner.some of the smaller scanners can't read all data

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  • Answer #2

    BLSessoms October 30, 2012, 13:36
     Rookie

    My car was doing this--turned out, it was the gas cap not seating well--cap was not turned enough times to tighten. (You may have to turn off ignition/turn on/turn off a few times for the light to go off if the cap is the issue).

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