My Cadillac Cts won't start battery is charged

If u have spark fuel is your problem. Have someone go inside car and turn key to on Position while you are under vehicle fuel tank listen for a hum sound. This signifies your fuel pump is working if it works change fuel filter if it doesn't come on check fuel pump relay try changing it with a similar relay if possible if your pump still will not turn on chances are you will need a fuel pump. Start with that and let me know how it goes

fuel pump works has fuel pressure