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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
According to google that code means Invalid Skim Key. This means the ECM (car's computer) either sees the key as being invalid or not programmed. Again, pointing to your programming.