Chevrolet 2006 HHR Owner's Manual page 100

Column Lock Release
The following procedure allows the ignition to be turned
to LOCK and for ignition key removal in case of a
dead battery or low voltage battery.
1. Make sure the shift lever is in PARK (P).
2. Using a tool, pry off the cover from the bottom of
the steering column.
2-22
3. Place your finger into the access hole and locate
the plunger.
4. Press and hold the plunger toward the driver's door
while turning the ignition key to LOCK. Remove
the key.
Have your vehicle serviced at your GM dealer as soon
as possible.