If you replace a pcm you have to reprogram its security key? So your key won't start car unless you do? What would happen if you changed lock cylinder and key from donor car along with Pcm? Would car start? I found seller parting out car with abs controller I need. And all other parts.

 

It depends on what year/model of Accord you're talking about.

 

01 accord ex v6

 

Pretty sure you can grab the PCM, keys, and ignition-lock cylinder and then you're OK.

For your convenience, you might also want the lock cylinders for the doors & trunk so the new keys can get in the door if your battery dies.