Where is the thermostst located in a 2006 cobalt LT 2.2 eng.

Here's a link to your code. P0973 Shift solenoid SS control circuit low

http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0996b43f/80/7c/be/01/medium/0996b43f807cbe01.gif

Turn off the alarm with the key fob. Using the key will cause the alarm to go on until you turn the ignition on, off, and back on again.

Hope The picture helps...

Thats Called A Missfire Under Load. if the ck eng lamps coming on have it scanned. its more the likely a ing. coil

Did you try replacing the bulb?

Have you tried shifting the gears completely through and then putting the car in park. It sounds like the car isn't able to be put completely in park to release the key. Try putting the car in N and removing the key. Even thought the car may not completely be in park to release the key, The gear most likely is in park but not enough to make the switch/sensor to release.

where is the body control modual located on 2006 HHR-LT

Check to see if the cable is attached to the throttle body. There should be two small cables, one goes to the gas pedal the other to the cruise control unit.

sounds like speed sensor on transmission