Its a recall issue, contact AGMC and they will fix this free of cost.
Read below. Just googled it.
Campaign Number: 05V504000
Dates Manufactured: 08/2005 to 09/2005
Model Years Affected: 2006
Date Owner Notified: 11/2005
Defect Summary: CERTAIN PASSENGER VEHICLES MAY HAVE BEEN BUILT WITH AN INCORRECTLY MANUFACTURED AUTOMATIC TRANSMISSION PARKING PAWL GUIDE PLATE.
Consequence Summary: THIS COULD CAUSE THE PARKING LOCK SYSTEM NOT TO ENGAGE, AFTER THE TRANSMISSION IS PLACED IN THE PARK ("P") POSITION. IF THE VEHICLE WAS PARKED ON AN INCLINE, AND THE PARKING BRAKE WAS NOT ENGAGED, THIS COULD RESULT IN A VEHICLE ROLLAWAY CONDITION.
Corrective Summary: DEALERS WILL REPAIR AND REPLACE THE AUTOMATIC TRANSMISSION GUIDE PLATE FREE OF CHARGE. THE RECALL BEGAN ON NOVEMBER 30, 2005.