Sorta what I've been thinking all along. "Unsupported" probably refers to the unit under test not having a possible feature, it's a "permanent" thing since the ECM doesn't have it and never will, and the specific reason is probably dependent on a cyclic/algorithmic/timeout issue during which the test software performs some task, be it time, number of tries, or similar, and my roulette wheel lands on 11 for whatever reason. I expect to see this with every inspection I have for the car.
I was never worried about it, just curious. Thanks for guessing along with me. We'll probably never know exactly what is happening, but I am very curious to see if any other MA owners get a similar result. I also wonder if the test equipment in MA is the same as the test equipment elsewhere. Never thought about it before.
Driving and working on a Sly 2008 Solstice GXP 5spd 260/260, and the worst-built 2012 LS3 Camaro 1SS to escape from Oshawa.
Gone but not forgotten:
2007 Solstice GXP 5 speed 290/340
Stored and needing to part ways with a 1970 Skylark Custom convertible I have owned since 1989 and turned into a GS455 clone. 462 with 7/8 primary headers, adjustable roller rockers, TA Performance Stage 1 aluminum heads, auto, Chevy 12 bolt, 3.31:1. Sadly a project car now but a driver from '89 to '06.