Tundra Won't Start

Hi all, I gotta a issue with my 2014 Tundra. The truck won't start it just cranks and cranks. Battery is great, it's a red security light that comes up I think it may be the immobilizer preventing the truck from starting up. It was working fine a few days ago the only thing I did was send out the ecu for a repair check.

 

Try a different key

 

Tried that already.

 

Disconnect the battery for 30min

 

Both terminals?

 

Just negative

 

If you disconnect the battery and it starts fine than its probably something with the immobilizer system if not maybe yiur ecm.

 

I had the battery disconnected when I hooked the ecm back up it started and shut off right away and after that it just didn't start

 

Try it again if it does not start than most likely it's the ecm.