ar9080

I haven't been back to the dealer yet, been driving the Silverado. I put a fuse in an empty space that was labeled for AT, which seems to have made the AT OIL TEMP stop flashing.

No updates on my end, I took it to the dealer a couple weeks ago and they flashed the ECU and did something else software related, and now the light show

I have a 2011 2.5i Premium, at about 148k I let the dealer do their 150k service, which includes a CAT fluid drain and refill. 12k later, I randomly begin to get a feeling of a hard upshift from like 2nd to 3rd like you'd feel on a malfunctioning conventional AT, and it's always between 20-30mph. Dealer stunned and clueless. "Master Technician" even experienced it and threw up his hands. Now I get the Christmas tree show and AT OIL TEMP flash. Pulled codes P0700 and P2763. Transmission jerk between 20-30 is gone, seems to idle and rev a little higher, and fuel economy is Tribeca-like. Any ideas, suggestions, words of encouragement? Car has just over 160k on it