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I tracked power to the trailer module above the spare

https://a.co/d/j1N1uCl here is the link to the OE 4 wire pigtail I ordered. Hope this helps. I just placed the missing wires into the original pigtail and color coded them then traced the power line and wired in a ground. I didn’t want to cut any original wires. They just clicked right in.

Yes, i just had to add power and a ground wire. No programming needed bcm recognized it right away. I did buy an OE connector with all 4 wires from Amazon for ease of install. Look at my above post for wiring. And I bought my module using myChevrolet points, it’s only $100 for the module. Good luck

I’ve been having the same troubles and bought my 2019+ Silverado with 20k miles last year as a certified used and I am trying to get info if this would be covered by the 12 month warranty?

I know this has been here awhile, however, I found that on my 19+ Silverado with the Trailer TPMS harness it has only the #3 and #4 pins installed. I have to install power and ground terminals for the module to be seen by the BCM. I've found that this dealer install option has their tech installing these terminals and functions properly once completed. Hope this helps i've added the wiring diagram for anyone who needs it.

TPMS Module Wiring.pdf

I found this on GM Tech Support: Loose Gear Seletor 2019+ Silverado.pdf

Loose Gear Seletor 2019+ Silverado.pdf I found this in GM Tech Support: