Chevrolet 2008 Cobalt Owner's Manual page 98

Column Lock Release
For vehicles with an automatic transmission, the
following procedure allows the ignition to be turned
to LOCK/OFF and ignition key removal in case of a
dead battery or low voltage battery.
1. Make sure the shift lever is in PARK (P).
2. Remove the cover from the bottom of the
steering column.
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3. Locate the plunger.
4. Press and hold the plunger while turning the
ignition key to LOCK/OFF. Remove the key.
Have your vehicle serviced at your dealer/retailer as
soon as possible.