2004 Denali Trans issue

Discussion in 'Troubleshooting & Diagnosis' started by canadian 79, Aug 20, 2017.

  1. canadian 79

    canadian 79 Veteran Member

    Dec 19, 2010
    springfield mass
    I have a 2004 Yukon Denali with the 6.0, the trans will not shift out of first gear, PRNDL1L2 indicator works as well as MPH and tach, ant suggestions? FYI it does have reverse
  2. Joekool

    Joekool Veteran Member

    Feb 4, 2002
    Hollister CA USA
    Is the check engine light on or reduced power displayed on DIC? If so, you need a scanner to read the code(s), even if it isn't, might still want to see if there are any codes stored relating to the trans.

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