I blew a tranny line on the highway about 4 months ago in my Chevy 2006 Silverado 5.3l. I decided to have it rebuilt with a 3 year warranty.
After I got it back, it would drive fine then shift rough after I came down from highway speeds. When I turn off the truck and restart it, it shifts fine. After I get back up to higher speeds and come down, it acts up and shifts rough again. Eventually it threw the P0894 code. The code is for transmission component slipping. I took it back and he said it was a sensor or something. Next day, hard shifting and code again. He said it must be something else with the tranny and fixed fixed that. (Sorry I don’t remember both of these repairs, but I can find out). Couple days later, same code and rough shifting. He replaced the tranny this time with a manufacturers refurbished. Next day, same code and same rough shifting after highway speeds, but in addition to this, a message appeared saying Transmission Hot.
Thoughts? Haha. I’m lost and I think my transmission guy is as well at this point.