FYI, I took it (2015 Escalade ESV) to the nearest Cadillac dealer and after sitting more than a week I brought back from them.
Either they don't know how to trouble shoot the cause or don't have time to take a look.
My truck seems to be sitting in their lot for more than a week.
When I first dropped off the truck, they said it's normal and couldn't duplicate the cause after few days of testing so I went back to pick it up. They washed the truck and left my truck in the guest service pick up area but when I got in and try to start the truck it won't start so the master tech came and saw what is happening as well as my service agent/manager but after week later they still couldn't figure it out.
Anyway when this symptom happens it gives black screen (nothing on the display gauge)
Sometimes, it does it while it's driving, and when this happens the trunk won't open trunk gate nor the turn signals so have to use rear doors to unload luggage
When it happens, I don't turn off the truck till I get home, I can't turn off the truck just in case it won't start again.
Is this something to do with BCM ( Already checked - remove the covers to check with magnifying glass to see if there's any damages or burn but it looks very clean)
This is very frustrating; another symptom is the theft deterrent light on the dash. This is something I know how to fix (temporarily) I learned how to reset the theft deterrent on YouTube (put the key on for few minutes till the theft deterrent lights turns off and I believe I have to do this steps 2 or 3 times till it recognize my fob)
But the light turns super bright with no theft deterrent light on, it just won't start. Trying back after few mins or an hour later it starts to work again.
New replaced OEM parts: Car Battery (non oem), key fob batteries, alternator, starter, cleaned the ground cable and ran another ground cable to the chassis, amplified antenna, start button, always test with meter to check current voltage when it doesn't start.
Any suggestions or recommendations are welcome
