Then replace the battery.
battery cable connection , dead battery
altinater is probobly dead
Call OnStar
If no light is on and no relay is stuck then the battery has a dead cell and needs replacing.
Use a slim Jim
er, there SHOULD be a key...separate from the ignition key...
dead battery bad terminal connections starter relay
Either the battery has a dead cell which will drain the other cells, or something is on and draining the battery. Possibly trunk, glove box, or under hood light. Have the battery tested for a dead cell.
The battery may have a dead cell and need replacing. You may also have some light that is on or a relay that is stuck.
You may need a new alternator and or battery.
If the battery wont take a charge, the cells are dead. replace with a new battery. Good Luck
Change idle speed contol sensor Uncool the battery for five minutes to reset the computer.