2022 Silverado 2500HD Duramax Transmission Temp High with Normal Driving, Not Towing

[D Fowers]

Update: I just got off of the phone with the dealership and they have received the valve body for my truck. I will be dropping it off in the morning to have it installed. I will update once I have had a chance to drive it and see if fixes the transmission temperature issue. This has been a long frustrating 4 months, let's hope this is the fix!

[D Fowers]

UPDATE.....I picked up my truck yesterday afternoon after having the transmission valve body replaced and it looks like that did the trick. The transmission temp got as high as 142 yesterday and even went down to 138 at one point. I am excited, I feel like I finally have the new truck I ordered after having it for 4 months. I hope this is the fix for the others on here having similar issues. If anything changes I will post another update.

[Jim 2022]

2 hours ago, D Fowers said:

UPDATE.....I picked up my truck yesterday afternoon after having the transmission valve body replaced and it looks like that did the trick. The transmission temp got as high as 142 yesterday and even went down to 138 at one point. I am excited, I feel like I finally have the new truck I ordered after having it for 4 months. I hope this is the fix for the others on here having similar issues. If anything changes I will post another update.

 

2 hours ago, D Fowers said:

UPDATE.....I picked up my truck yesterday afternoon after having the transmission valve body replaced and it looks like that did the trick. The transmission temp got as high as 142 yesterday and even went down to 138 at one point. I am excited, I feel like I finally have the new truck I ordered after having it for 4 months. I hope this is the fix for the others on here having similar issues. If anything changes I will post another update.

That's awesome news!  I'm still waiting on the valve body to arrive and hope to have my truck back soon!  Thanks again for posting and sharing.

[Jim 2022]

Update...I just called again to check the status of the valve body part that has been on back order for my truck.  My truck has been parked at the GMC dealership service department since 10/13/2022.  I finally have an ETA date of 11/30/2022 for the part to arrive.  Hopefully the part will arrive at the end of the month and that it will resolve the issue!  I'll provide another update the first part of December.

[Jim 2022]

Update...the dealership received the replacement valve body for my new 2022 GMC Sierra 2500HD Denali.  They got it installed and I picked up my truck on 12/1/22 and have not had any more problems so far.  The highest temperature that I've seen the transmission fluid reach so far is around 155 degrees.  I have yet to tow anything but the temperature was reaching around 256 degrees before and without towing anything.  Yay!