Hi and welcome.
You need to relearn the key cylinder to the PCM. This is how you do it:
Turn the key to run. Do not crank it. Leave it on for about 10 minutes until the security light blinks (or) Goes out. Turn the key to the off position for 10 seconds and then repeat above.
You will do this 3 time for a total of 30 minutes. At the end of the 3rd time start the car instead of turning the key off.
You may also use this guide if it helps.
https://www.2carpros.com/articles/how-to-reset-a-security-system
Let me know if this helps.
Rich
Wednesday, September 25th, 2019 AT 8:34 PM