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I'm having the same issue, I've tried replacing the module and still does the same thing only 2 bars for heat and 0 for cool, I thought it might be from converting to Sync3 but i used ForScan and everything in those settings is correct.

I had this same issue, I checked to see how many amps were being pulled worth the truck off then started to pull fuses until it dropped, mine was the radio fuse, which was stock, turns out the APIM was bad and was pulling 6-8 amps with the ignition off. Eventually I converted it to the sync...

My parasitic draw was from the APIM, I pulled fuses until the amps dropped 4 to 0 and it was my radio fuses that did it. I took it in for warranty repair and they further isolated it to the APIM.

Not sure if this is an issue or the same on Gen3 but my Gen1 broke down in the middle of nowhere because the fuel pump module went out, it's a cheap part and in a bad location (above the spare tire) so it gets hit with all kinds of debris, now I carry a spare one just incase because had I had...