As far as I know only the dealer can do this for you. When you bring the car to the dealer have all keys and keyless entry fobs with you as they all have to be recoded.
see also 2004 silverado
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Your keyless remote might not work for your 2002 Chevy Tahoe because the battery in the remote is dead. You can replace this battery by prying the remote cover off of the back of the remote or by removing the screws holding the cover closed.
check out the website www.automotivehelper.com
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