Yes I was able to diagnose and correct mine. The issue wasn’t the BCM; I never ordered one. The issue was the side detection module(s) were damaged and corrupting the entire canbus making the electronics go crazy. For now I disconnected both side detection models and the truck runs perfect. I have to buy new modules later.
I’d recommend looking at module faults and disconnecting them one at a time to see if your problem goes away. From all my research into this a bad BCM is very unlikely; it’s most likely a bad module corrupting the bus.
This was the exact problem I had on my 2016 Tahoe LTZ. It was the driver side blind spot detection module (Part 23455664) that was the culprit. I was getting the no start, theft deterrent problem and tons of error messages. Based on your findings, I removed the module this morning right behind the driver side back bumper. It took 5 mins to remove and it started right up (three 7mm bolts and a power plug). There was a broken corroded pin that was causing the issue. I was all ready to go the BCM replacement route but decided to have one more bourbon before bed when I found your post.
Thank you so much for this info as it saved me a ton of money and downtime.
