How do you turn off the check oil indicator light in a 2005 Chevy impala?

If it is the message center telling you to check the oil; look in the owner's manual and there are steps on how to turn it off through the radio.

For most impala 2000 and up... turn key ignition to ON but do not start the car. pump gas pedal 3 times fast. then turn car off. now start the car. light should clear. hopefully you've changed the oil first though.