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So, I finally stumbled on this thread, but there's no resolution to the problem. Nice to know I'm not the only one with an issue. ...

You're absolutely right. I was thinking BCM, but it is on the GMLAN network from the HVAC module. I have seen a few facebook posts asking about a module to send the message to the ECM, but never...

It's a 2008 GMC Sierra 1500, engine is VIN 3. Both the Snap-On scan tool and the VCM Scanner say the same thing. On the diagram, you'll see a gray wire at the sensor with the 5 volt reference, the...

So, I'll add the log file. Not much to see, really, because the AC stuff never changes. You can see where I turn it on then off with the engine RPM and load. I guess the real question is something...

Thanks in advance for the help. I tried a thorough search and didn't see anything related. I've been a Master ASE tech for years, but this is my first experience in the tuning world, so I'm trying...