For starters, check out: http://www.jeepforum.com/forum/showthread.php?t=396997
I had the same problem. Google "keyless entry remote 2003 Jeep Grand Cherokee".
I found a remote for my 1997 Grand Cherokee on Ebay. type in the number "05014736". The remote if for the newer generation Grand Cherokee, but I took it to the dealer, and they programmed it for free.
the dealer does it with a scan tool
replace the remote
It most likely will, grand Cherokees didn't change much those years. As long as they are both grand Cherokees, and as long as one isn't a Cherokee and the other is a grand Cherokee.
How do you change the orifice tube on 1997 grand Cherokee jeep with 5.2 v/8
Possible weak battery in the remote.
No, remote start was not a factory option in 2000.
Check Google.com
Advance auto and Carquest auto parts.
You have to program it with a DRB (Scan tool).
centre top dashboard (red dome)