Question about 2002 Chevrolet Silverado 2500HD

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When connecting code reader to ecm, code reader is giving error message that code reader is not connected and i have tried 3 different readers they all do the same thing,.note: service engine light is on and i am trying to read the code.its as if plug under dash is deffective or not connected to the truck ecm.vehicle is 2002 2500hd 6.0L gas.note: key switch is in the on position when performing test. vehicle mileage 69324. how can i determine what code the ecm is throwing

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Check to make sure that the fuse to the cigarette lighter is not blown or that something like a penny has not found its way in there and shorted out the fuse. Check all the fuses because it will throw the diagnostic tool off if they are blown. *** Please rate me on this answer.***

Posted on Jun 06, 2010


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I hope this helps you get pointed in the right direction

If this helps please vote me up.


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try a different reader and make sure not to strat the car. I doubt the stereo is causing the problem

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