MikeBMW

Yep! This should be a pin somewhere as @pgamboa really dives into all of this. Thanks for reposting the link!

Interesting information, thanks! I bought the ADC camera and it helped a bit but not dramatically so,

Sounds to me like normal fuel injectors firing off. Mine has been the same for over 5 years.

For the transmission I just went with the TSB. Chevrolet TSB 21-NA-199.pdf

Have you tried this option? ADC rear camera upgrade

I went with Borla Touring cat back exhaust. I thought about the ATAK but figured my neighbors might prefer a bit more quiet.

The Amp power steps are great! I've had them installed for quite some time. I do, however, have to replace the cushioned bump stops so I don't get a metal clunk when they deploy.

My truck didn't have a brake controller from factory so I had the dealer install this: Curt Spectrum trailer brake controller

Awesome you got it sorted! That's a new potential issue I'll have to mark in my book of issues. Thanks for the feedback.

Therefore, I presented the caveat about erasing codes and then check if the issue returns. I'm still leaning toward a BCM issue.

I've referred to this many times over the years and I've had zero issues after the installation. Also, it helped a friend of mine resolve transmission issues he was having with his 2018 GMC Sierra. Chevrolet TSB 21-NA-199.pdf

Yep, refer to Chevrolet TSB 21-NA-199.pdf

Seems to be a BCM issue. Have it scanned and checked for codes. Erase all faults and see if the issues return. If so, you might want to reach out to White Automotive for a BCM replacement.

I had tow mirrors installed by the dealer. They replaced the door harness (still have the original if anyone needs it). Later, I bought power fold tow mirrors from boost auto, no need for a harness but I did have to buy the folding switch setup for the door panel.

For what it's worth, Ive never experienced a bad HMI module. I've installed many of these as I upgraded to a navigation HMI. I still have two sitting on the shelf but they would have to programmed to your VIN which is what WAMS does. If you find that to be the issue, I can send you one but, again, @GTPprix would need to program it.