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I have a 2008 cobalt wont start no light on dash board except lock comes on and goes off.turn signal work and radio.I have checked ecm fuses and some have no power to them.I checked fuses on bcm and some of them dont have power to them.I can jumper to crank relay it will crank engine. I have not taken it to see if there are any trouble codes.The check engine light doesnt work..I have checked grounds. I just do not have a clue to what could be wrong with this thing. I have ben working on this for a while.I hate to replace ecm have it prgrammed and that doesnt fix it.I even thought of bcm. Something is I am loseing power to part of ecm part bcm and dashboard . Give me some ideas thanks perogers56
 

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Did you check the big BCM fuse in the trunk beside the battery?
 
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