Hello and thank you for using Just Answer
do you have another key you could try?
or you could try a relearn on the key
to do this turn the key to crank for 2 seconds then release to the run position and leave it in the run position for 12 minutes...
you can then turn the key back off and then try starting if it does not work repeat 2 more times
if you still have problems you may need to replace the lock cylinder
let me know how you make out