Chevrolet 2006 Malibu Owner's Manual page 78

When a new vehicle is delivered, the key has a
bar-coded key tag. This tag may be removed by
your dealer before it is delivered.
2-4
One key is used for the
ignition and all locks.
Each tag has a key code on it that tells your dealer or a
qualified locksmith how to make extra keys. Keep the
tag in a safe place. If you lose your keys, you'll be able
to have one made easily using this tag. If you need
a new key, go to your dealer for the correct key code.
See Roadside Assistance Program on page 7-6 for
more information.
Notice: If you ever lock your keys in your vehicle,
you may have to damage the vehicle to get in.
Be sure you have spare keys.