Dt12 Transmission Problem

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by LakenT, Mar 19, 2023.

  1. LakenT

    LakenT Bobtail Member

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    Jun 19, 2022
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    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?
     
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  3. Lazer

    Lazer Road Train Member

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    First check the trans oil level, and condition of the oil. What is the engine temp. when the trans is at 200?
     
  4. LakenT

    LakenT Bobtail Member

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    Jun 19, 2022
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    trans 200 engine 150
     
  5. Lazer

    Lazer Road Train Member

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    Check the trans oil level.
    Check the accuracy of the trans temp gauge.
    And as a side note, if the engine temp never gets above 150, you have an issue there also.
     
  6. LakenT

    LakenT Bobtail Member

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    Jun 19, 2022
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    found out the splitter pin needed to be replaced. I actually was reading the oil temp wrong I was looking at engine oil temp.
     
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