Bought a used automatic Cascadia Evolution with the DT12 transmission back in July that has been running fine until a couple weeks ago. When accelerating between 5th and 7th gears, the Hill Assist light and ABS light for the tractor turn on and the transmission switches into manual mode. After that, those lights turn off as well as it runs fine without any loss of power but we want to get this figured out before it causes something else.
We think it may be an air issue as it has always been slow to air up in the morning. Our other truck is a stick and airs up fairly quickly so we weren't sure if these autos just take forever to air up or what.
I see plenty of posts where they get stuck into a gear but that's not our problem. Anyone have something similar to this happen?
2015 Cascadia with DT12 Transmission switching to manual mode by itself
Discussion in 'Freightliner Forum' started by D&S Enterprises, Oct 15, 2019.
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