Ok i've had it to the dealer, they reflashed the new ecm. They didn't say that they did the pass-lock relearn so i'm attempting to do that. They also diagnosed it for 2.5hrs and couldn't figure out anything they said. Now the issue i'm runnin into is when i start the car it'll start and run for 2 seconds then dies. The problem i'm havin is the theft light doesn't flash and the odometer reads "error", it stays constant along with a few other lights. Also, even with the key in the ON position the radio doesn't work.

Do you have to have the BCM re-flashed like the ECM? If the passcode re-learn method doesn't work I think that's gonna be my next route and was just curious