This might help, found a bulletin for this problem. Subject: Automatic Transaxle/Transmission Shift Lever May Not Shift Out of Park (Replace Brake Transaxle Shift Interlock (BTSI) Solenoid)
Models: 2004-2006 Chevrolet Aveo
2004-2007 Chevrolet Optra (Canada Only)
2005-2006 Pontiac Wave (Canada Only) Some customers may comment on either of the following conditions: " The automatic transaxle shift lever may not shift out of the park position and the ignition key cannot be removed (North American vehicles only).
" The automatic transaxle shift lever may not shift out of the park position (vehicles outside of North America only). Replace the brake transaxle shift interlock (BTSI) solenoid. 96858794
Solenoid A Select Lever (Left Hand Drive)
Solenoid A Select Lever (Right Hand Drive)here are the part numbers. Post back if this fix's it.