The GM tech was right. The ECU isn't reading the A/C pressure.
And, so, continuing on with this thread where I'm talking to myself, I've picked up a salvage yard E67 (from a 2011 Malibu) and it's on its way to Austin where I'm having a 2011 ZR1 OS loaded on it.
From there, I'll move my GMPP LS9 tune to the ZR1 tune. I'm hopeful that this new setup will read A/C pressure and support PWM output.
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