Security light stuck on car engine will not crank?

The car listed above is an LT model. Recently I had a problem similar to now with the security light staying on and not allowing to crank. Let me start off by saying that I'm not just some DIYer I'm an automotive technician and currently I'm the diagnostic technician at the shop I work at in Sacramento CA. But this one has me needing some help probably because it's my own car and there for more stressful but less. I recently just had my vehicle theft deterrent module go out on me. It's the part that goes around the ignition lock cylinder and whose job is to read the chip in the key. Well, not a big deal just replaced it and did the relearn for the key car fired right up and hasn't had any issues until now. Now when I turn the key to run just like last time the security light stays on, except this time there's no message on the instrument panel saying service theft deterrent or anything at all regarding the security light being on. Scanned car and it didn't even have communication with the theft deterrent module now it just makes it even harder because the last time I fixed the security light issue. I didn't have a scan tool with me so I'm not sure if I do in fact am supposed to be able to communicate with a theft deterrent module or not, but I currently have no codes in the BCM and only 1 code in PCM for oil pressure sensor circuit high. The only thing I got any feedback from regarding the security light was from the IPC or instrument panel which gave a U0168-00 code which is for no communication with vehicle security module. That's it. I've tried doing the relearn again except I can see under live data that the relearn is not starting and is inactive and I can't get it to start to relearn no matter how long I let the key sit in run position or whether I attempt to crank the car or not it never starts the relearn and I never get any message in the instrument panel saying anything about needing to service theft deterrent or anything about the security light it's simply just on and there and won't let me crank the car. Please, can someone help me out here on where to look?