Go to a parts place like Auto Zone and get your battery load tested.
Check the terminals and clean those things including the battery post.
If that doesn't help maybe a CTM that you could pick up and have installed and programed by the dealer.
Last but not least it very well could be the grounding between chassis and battery.
Check to make sure no water is getting in close to the CTM on the drivers side kick panel.
Last edited by hydrashocker; 04-10-2009 at 11:40 PM.