Dt12 transmission air problems

Discussion in 'Freightliner Forum' started by Mflegacy, Jan 19, 2023.

  1. Mflegacy

    Mflegacy Bobtail Member

    Jan 19, 2023
    Hello. I have a 16 cascadia with dt12. Recently my truck started to rev when I would shift from even # gears to odd # gears. Ex 8-9 10-11. But doesn't rev when shifting from odd gears to even gears. Or even odd gears to odd gears. Any idea what this could be?
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  3. Timm1q

    Timm1q Bobtail Member

    Mar 14, 2022
    Hi. The same. Did you resolve it?
    As for me - did already program update - no changes. Mechanic connected to truck and checked for faults - all is good.
    Why did you think that the problem is connected with air?
  4. NorCenArk

    NorCenArk Light Load Member

    Mar 31, 2011
    Russellville, AR
    My 16 Western Star with DT12 is doing the same. A friend of mine has software for troubleshooting, we did a transmission and clutch relearn but it did not change anything. Next thing I will do is check wiring harness to TCM and pins to make sure there is no corrosion.
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