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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

    • April 28, 2025 at 1:02 pm #862248
      Blaggus552
      Participant

      I have a 2024 AT4X with the EXACT same issue. When the temp is <40 F, usually during first drive of the day, when I come to a stop or slow to approximately 8mph, the transmission will downshift harshly into 2nd gear. It is so abrupt that it feels like it will tear the driveshaft out. Are any other 2024 AT4X owners having the same issue? Please speak up!

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