Timing Chain code on/off

My issue is very similar to the thread below. Timing code has been shown on for a week and off for a week in a trend that has lastest about a month. Got an oil change at dealership while code was off then it turn back on a few days later. Technical thought the timing chain tensioner could be off. I feel repairs are imminent but need advice. Currently 190kkk daily driver (!!!)

https://www.cadillacforums.com/foru...69-p0008-comes-off.html#/topics/859569?page=4