Sounds as though the original key has a electronic tag/immobiliser inside it... which the new copied one wont have......... some manufacturers (ie FORD, SUZUKI) also have this system.... and usually issue a 'Master' key which is sometimes coloured RED.... and is used to program new keys .... which unfortunately have to be issued from the manufacturer..... dodge....ford.... etc etc
If you get a new key supplied from the manufacturer, what you normally have to do is use the red key first in the vehicle.... then with a specific series of turns of the key then insert the 'copy' which will then become programmed for your vehicle....
Clarify if this is the case with your dealer........ hope this helps
Firefox
December 2004