No crank,,,Lights are bright,,,

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2009 cts,,,,Engine light stays on,car will not crank,headlights are bright,,everything checks out AOK,,,,,,,,,,,,,,,,,,,,,,FIX by,,,removing ground cable bolt on top of passenger fender under the plastic cosmetic cover,,then ,FILE out hole and put new self locking bolt in,,,,,and problem is solved,,((Love GM)),,,,,,,,,