Accidentally used an old key to start a newly programed system
Our 2004 Pontiac Montana was recently
recalibrated and given new keys. I found my old
key and accidentally tried to start the car. Now no
keys work. What can I do to start my van?
You can try matching the key again. You may require service of some locksmith or technician for this: https://www.youtube.com/watch?v=PV7LJf47oWY
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