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I was recently checking my fuses on my 2008 cobalt, the car was still running but then I turned it off and immediately tried starting it but no crank or anything. Then it was giving me a U0100 code. And now the dash lights or radio don't even come on. Only the light with the car and padlock comes on. Have anyone else had this happen?
 

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Something has gone wrong with your security system. I’m not sure how you were checking the fuses.

If using a test light that is grounded to a bolt or something, it should not cause a problem.

It is possible you’ve caused a short in the body control module for it to have the security light on and not starting.
 
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