Hello,
It sounds like the BCM is going out. To be sure lets check the fuses. Here is a guide to help us with the brake light wiring diagrams below so you can see how the system works and which fuses to check with the BCM location and replacement instructions below:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
A CAN scan would help see if the BCM is bad as well.
https://youtu.be/InIlnsjOVFA
Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Wednesday, August 7th, 2019 AT 7:22 PM