sounds like it needs a security learn. not sure how it goes for that car, but the regal is key to run for 10 minutes then off and back to run with in 10 seconds repeat 2 more times and they crank over the next time you crank it.
make sure you have a good battery or a charger on, e brake on to kill the lights so they dont come on, it takes a 1/2 hr to do.
i roll the windows down and walk away from the car, (i use a timer on my phone) you cant open the door or anything while you do this, so sit and wait, or do it through the window so your not trapped in the car.
