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2023 Gmc Canyon Transmission harsh downshift in the morning

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    • April 3, 2025 at 6:06 pm #858958
      John19789
      Participant

      My 2023 Gmc Canyon has a harsh downshift when coming to a stop in the morning, I’ve been reading that GM says that it is normal, but this is a pretty huge issue. It slams into 1st gear almost like it’s going from 3rd to 1st right before the truck comes to a stop, anyone else have this problem?

    • April 15, 2025 at 1:27 am #860450
      John19789
      Participant

      I just found out about the Valve Body issue that GM has. I got the Valve body replaced. the problem is gone now but it is the same valve body that they had and put in it and I am not happy about this at all because the problem will come back and I’ll just be going through valve body replacements. 2023 canyon elevation 8L90.

    • April 15, 2025 at 10:14 pm #860614
      Parts Man1
      Participant

      GM just came out with new bulletin to address these problems. Bulletin #25-NA-080

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