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My remote stopped working for my doors and trunk.I tried reprogramming it a few times but it would stop working within a few minutes.I went and had the battery tested at the dealer and it was dead.I got a new one and when they tested it on the battery tester it was working.I programmed it on the car and it worked for a few hours and now doesnt work anymore.I tried several reprograms with no success.What could my problems be?Do I need a new remote or is something wrong with the computer?
Chances are you need a new remote. Sometimes they just wear out or something breaks inside.
If you have a spare try that one. If you have a friend with a 2000 you can try his/her.
Check on Ebay for a new one or in the C5 parts for sale section.
Make sure your CAR battery is fully charged. An undercharged battery can affect programming.