GMC Trailblazer transmission wont shift from 2nd to 3rd. Ran low on fluid!?

Have a 2003 Trailblazer. Had a tranny leak I didn't know about. Fixed the leak, filled it up with tranny fluid. Will shift from 1st to 2nd. I can get it into 3rd if I push the accelerator very hard, never 4th. Had the codes ran at a local shop and they found no errors. Any ideas of what the problem is? Thank you so much!


Ran 5 quarts low.

3 Answers

  • 6 months ago
    Favorite Answer

    If there are no transmission codes it's a mechanical problem and you'll need a rebuilt transmission.

    An OBD II code reader can not read transmission codes. Tranny codes require a $3000 scan tool to read them and the transmission data.

    Source(s): Mitsubishi Master Tech
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  • Jason
    Lv 7
    6 months ago

    Time for a rebuild.

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  • bo
    Lv 7
    6 months ago

    yea it now needs to be rebuilt. you ran it low on fluid. bet the fluid has a burnt smell to it. find local shop at ATRA.COM for estimate to build it

    Source(s): transmission man
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