Yes, I shut it down and waited for the timer before continuing, and then after that, it sat overnight before being started again. It was Thursday evening that I read the ECM, but today that I hooked up with the MDI2/TechConnect/GDS2 because Onstar was complaining, and that's when I found the modules 'not responding' according to GDS2. Like I said, no drivability issues, the car wasn't complaining about anything, no CEL, no other DIC messages, only OnStar, and if I didn't have a MDI2/TechlineConnect/GDS2, I would never have known about modules being unresponsive, yet they were still functioning...
Edit: Just to clarify - there weren't loss of comms DTCs. When GDS2 was polling all modules in the car, several that are there and had been polled previously, like the cluster, came back as 'not responding'.
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