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Yukon denali trans won't shift out of first. It still goes in reverse. Changed shift selonoids. What's the problem and what caused it?

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  • Zan GoFresh
    Zan GoFresh Apr 22, 2017

    Ran a scanner on it no transmission codes.

  • Jeff Armer Apr 22, 2017

    What year yukon ? Does it have a separate transmission control module or does it have a PCM -powertrain control module ?

  • Zan GoFresh
    Zan GoFresh Apr 22, 2017

    I do not know, but it was changing after you let your foot off the gas.

  • Jeff Armer Apr 22, 2017

    Do you know how to do electrical testing with a volt meter , voltage drop testing . Checking power an ground circuits at a control module ? No code's find wiring diagrams here http://www.bbbind.com/free_tsb.html Videos on youtube voltage drop testing , electrical testing you need to know . Could be possible the control module isn't turning shift solenoids on .

  • Zan GoFresh
    Zan GoFresh Apr 23, 2017

    Nope, I don't have nor know how to use a volt meter.

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  • Cars & Trucks Master
  • 11,704 Answers

Have you had it checked for DTC'S - diagnostic trouble codes ?

Posted on Apr 22, 2017

Testimonial: "Ran a scanner on it no transmission codes."

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