The check engine light is not the problem. You have a failed automatic transmission. Have it removed and rebuilt.
SOURCE: how to remove the door panel on a 2005 grand prix
Just an philips screw, you'll need to remove screws that are by the door handle,
arm rest, under door and side of door and then gently pull back on the
panel as there will also be retaining clips attached and you don't want
to break them.
If needed, you can pull back the weather seal
(can't reuse it, but it's not that important) and you will be able to
access everything inside the door.
Hope helped with this (remember rated this).
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