Long story short I had a couple emmsion codes pop up a few months back and my local mechanic fixed them. Wanna say he had to replace a water pump module? Seems to be a fairly common thing in my truck (2020 6.2 AT4).

However, recently I've noticed when I'm off the gas slowing down it will sometimes downshift a little hard. Not violently but you can feel it if you're paying attention to it. I spoke with my mechanic and he recommended a flash update from the dealership. I called local dealership and they said they won't do that unless the transmission was replaced.

What say texags? I really don't want to send my truck to a dealer and have them fish around for problems for the hell of it and it cost me thousands.