Hello Scotty , recently I had a problem with my Mazda Rx8 (2004) Automatic . It had been driving fine until this week. Now the key won't start up the car or crank at all and the security key light on the dash keeps flashing. I was able to diagnose it and apparently its communication error between the keyless control module and the PCM (no response or mismatched conditions).. I was told by a mechanic that the entire ECU will need to be replaced or there is probably a short in the system. Will I need someone to program the new ECU to work with the car. Is there anything I can do besides replacing it... thanks. 

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yes it would need reprogramming by a pro. But have a locksmith try to get it working first, many can do that