This might be helpful for others!
Spoke with a friend/GM tech.
Apparently GM has trouble with the connection at the ECM. They call the issue "micro abrasions" and they are brought on by vibration.
The fix, according to GM, is to unplug the harness from the ECM and plug it back in, then repeat for a total of 4 or 5 times, then unplug the ECM and apply a thin smear of dielectric compound to the female terminals and plug it all back in.
According to my friend, this little issue causes all manner of odd, intermittent issues.
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