Join Date: Aug 2008
Location: Upstate NY
Drives: 00 Sportage; 55 CJ5
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It could indicate an electrical problem or a low ATF situation. Also, on the side of the shift lever there is a button. when going uphill you can push this button and it keeps the transmission from shifting out. When this is engaged "Hold" appears on the instrument panel.
Save yourself some stress and get Auto Zone or other to retrieve the error codes stored on your ECM. This should tell you what the problem is.
It ain't broke till you can't fix it anymore.