The dealership won't even look that far.
If they can't reproduce it, they can't diagnose it. They won't even check Historic Diagnostic Trouble Codes. They want me to buy a car.
I have no idea what to look for.

 

tighten these 4 bolts they are 7 mm so use a 6 point 1/4” drive socket

 

What historic codes?
Historic means they have been remediated just waiting for 100 cold starts to go away. Only pending and current codes matter.

 

The shop is trying to tell me there are >no< historical codes present. I suspect that's another symptom, if it's true.

100 starts? Really?

 

Done already.

I understand the ground is screwed into the transmission casing?

 

Yes there’s one there and one on the rad cradle and several other places

 

I just got off the phone with GM Customer Support. Essentially they're telling me that they've abandoned the model, and have no historical maintenance information. They recommended an independent repair facility of my choice.

Then they informed me that I'd be getting a survey on how they have helped me resolve this issue. Really?

 

Any details on where to find them? Chevy just washed their hands of the problem. I pick up the car tomorrow.

 

Here’s the one on the rad cradle , look on the drivers side of the engine bay above the headlight. The other end is on the transmission housing just down to the right of the oil filter cap.