2019 Cadillac XT4

I took my suv in for diagnostics to a certified GM dealership at least twice while still under warranty. The check engine light was on, the car was behaving abnormally as well as making unusual concerning noises. The dealership sent me away saying no codes showed up and they couldn’t find a problem.The light would come on and off sporadically. I took screen shots of my dashboard every time the light came on. Within months of my warranty expiring xI was traveling to IL 1.5 hours from home on I-90 during heavy traffic. Suddenly the dashboard provided extensive messages ex: engine overheating, idle engine, etc and I could not get the rpm’s over 68, then 65; then 60; then 58 etc. I pulled over to let the engine cool on the side of a four lane bumper to bumper interstate environment alone. I had to have the car towed back from Elgin on my dime and took it into the same dealership where this time I spent 1700 on what I recall being told “engine coolant repair” as they claim small leak. Less than a month later the check engine light came back on so I took it back to the dealership. My Cadillac app was registering the same alertmas before the fix : engine coolant system. Dealership said it was a blown head gasket (something about cyl 1) sep from what they worked on for the 1700 and ate wanting over 3700 for this repair. My car was I believe months out of manufacturer warranty though I complained multiple times of concerns and because it is a “separate” issue from May repair and no year warranty from them either . 7 day wait for replacement part alone. I had car towed directly from dealership it was at to a mom n pop auto repair center in town awaiting full diagnostics, preserving “evidence” I learned online my particular suv (2019 Cadillac xt4 premium luxury) is known to have engine and other issues that don’t register codes and likely over 90% chance related to misdiagnosis or a band aid repair. *i have screenshots of dash, “my caddy”app alerts, etc*

In September, my vehicle would not start. I had it boosted and it started right up. The very same afternoon , it would not start and had it boosted. Drove it for 2 days without issue and on day 3 it would not start and boosting was unsuccessful. The vehicle could not be put in neutral and needed to be towed. The car spent several weeks at the dealer and I was told it was the battery which I replaced the key FOBS needed to be reprogrammed and then the wiring harness was chewed up. After several weeks at the show and over $1,000 later the car was returned. A month or so later , the car wouldn’t start, could not get boosted and had to be towed back to the dealership. After 2.5 weeks , I was told it was corrosion on the wiring harness. I’m concerned that these issues will persist and I could end up stalling in the middle of the highway, Vehicle only has 31,000 miles on it.