Tinman623

Check your grille shutters! My 2022 Silverado 1500 3.0 84,500 mi. has 2 upper and lower shutters. My 10L80 trans was running 190-195 trans temp I started looking hard and I noticed the shutters were closed. I removed the top splash pan (what I call it) that cover over the top of radiator and is held on with plastic push pins. I sprayed my upper and lower shutters on each end where they are held in with brake clean and then sprayed WD40. The road dirt, salt, etc. gets in there and doesn't allow them to open properly. My trans temp is now 170-175. Also I never had any codes. Not saying this is your problem but worth looking at.

Check your grille shutter ! They tend to stick from dirt, salt etc. Make sure they are opening properly . My 2022 has upper and a lower shutters.