We have a 2017 freightliner Cascadia with a dt12 trans. I have noticed when I drove it, it does not wanna shift into to gears easily. It will start to shift into 11th and back off and go into neatural and got back to 10th. Then it will skip shift over 11th into 12th. It also does this with other gears. It about 15 min the oil on the trans goes from cold to 200 degrees just normally driving. On Detroit diagnostic link there is a non active code for splitter pin. But I have seen this code many times and nothing happen. Now there is a issue and I'm unsure or what it is. Could it be the splitter pin, clutch, or clutch accuator?