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reprogramming key to car after changing battery on 2001 Cadillac Catera

Can I reprogram my key to the car after replacing my battery the car set for a couple of weeks and now my keypad won't unlock the car, I have already replaced the battery in the keylock also

Asked by for the 2001 Cadillac Catera
if you leave the key in the run position for aprox 15 to 20 mins the key should reprogram itself
Well I have been driving the car so it's been running for more than 15 mins but the keylock still will not work. I have to unlock the car with the key instead of being able to use the buttons on the keypad..