Bill123

Sorry Marcby, i was replying to Stan but my reply did not go through for a few hours for some reason. I had a 2019 Silverado 8 speed with transimission isuues so I traded it in for th GMC. Also, I believe a class action lawsuit has been filed against GMC for hiding transmission problems in 2015-2019 Silverados.

I have the same issue with my 2024 GMC Sierra. It has been in the shop for a month with no eta on a new valve body. From what I can tell this has been an issue since 2020 and is related to the recall GM just issued for some 2020 and 2022 GM vehicles because the valve body was failing causing the vehicles to go into reverse while in 8th gear. However, the fix is installing a software that senses that the valve body will fail within the next 10,0000 miles and puts the vehicle into limp mode so you will bring it in before it fails. If you own a 2023-2024 the software has already been installed. THe custermer care team replied to my claim today and said there is no ETA. The first dealer I talked to said it could be 6-8 months before they could get the part. My guess is that there is no fix yet and they are working on a new valve body.