Chevrolet 2005 Aveo Owner's Manual page 65

When a new vehicle is delivered, the dealer removes the
key tag and gives it to the first owner. The tag has a code
on it that tells your dealer how to make extra keys. For
vehicle security, keep the key tag in a safe place and also
record the key number somewhere other than inside of
the vehicle. If you lose your key, you will be able to have
a new one made easily using the tag.
One key is used for the
ignition, the doors and all
other locks.
Your vehicle may have an electronic immobilizer
designed to protect your car against theft. If so, only
keys with the correct electronic code can be used
to start the vehicle. See Immobilizer Operation on
page 2-16 for additional information. Even if a key has
the same profile, it will not start the engine if the
electronic code is incorrect. If you need a new key,
contact your dealer who can obtain the correct key code.
Also see Roadside Assistance Program on page 7-6.
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.
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