heater core replace...now immoblizer

Had to replace a leaking heater core. Had the battery disconnected for approx 18 hours while dash was out of car. After replacing the core and reinstalling everything I connected the battery back. The car started then died due to the immobilzer. Key locks/unlocks all doors but car will not stay running. Any ideas? Does it need a reflash?

got it...one of the cluster connections wasnt seated all the way.

How long did it take you to replace the heater core...?

df

10-12 hours