Chevrolet 2006 HHR Owner's Manual page 82

The key has a transponder in the key head that matches
a decoder in the vehicle's steering column. If a
replacement key or any additional keys are needed,
you must purchase it from your dealer.
2-4
One key is used for the
ignition and the driver's
door lock.
Keep the bar code tag that came with the original keys.
Give this tag to your dealer if you need a new key made.
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.
In an emergency, contact Roadside Assistance.
See Roadside Assistance Program on page 7-6 for
more information.
If your vehicle is equipped with the OnStar
an active subscription and you lock your keys inside
®
the vehicle, OnStar may be able to send a command to
unlock your vehicle. See OnStar
for more information.
®
system with
®
System on page 2-41