GM until very recently has been fairly serviceable at home. I pulled the engine out of our 2019 to do a timing chain, put it back and it didn’t even notice. I was worried the whole time it would have to be towed to a dealer to be reactivated, but nope, nothing.

Terrain diesel. Flex plate exploded around 100k miles so I pulled it and did the timing chain at the same time.

The stupidest part of this whole “always connected” BS is it doesn’t do anything for the car. I pulled and partially rebuilt the engine in my 2020 gmc and those stupid emails about the car’s health didn’t even notice. It keeps sending them to me regardless of me not paying for on star or if the engine is sitting in the garage. Made me want to find the antennae and disconnect it.

Everyone can already access coding.