My 2009 cadillac dts wont start battery is good all my lights
and radio turn on but car won't start and makes a buzzing
noise when I turn ignition
Just because the radio comes and the interior lights doesn't mean the battery has enough voltage to start the car. Have the battery tested with a multimeter or take it down to your local auto parts store. Should be over 12V to start the car.
If the battery is all the way up with voltage, then it could be either a starter problem or a bad ground strap
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