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I have a 2020 Chevy LTZ 4x4 with the 10 speed Allison. I was pulling through an intersection two weeks ago and the truck lost forward momentum (engine RPMs increased, but no acceleration). After about 100 feet forward momentum engaged. Was about a mile from home. Made it home and turned off ignition. Similar problem I had with a 2018 Denali duramax 4x4. So, I thought it would be an easy fix. Wrong! I cranked the truck back up and placed selector in gear and truck would not move forward or reverse. Had truck towed to dealership. It's been there for two weeks now and the dealership can't fix it. They have called for a service rep so I was told today. I did not get the code. I was told it was a valve body. That did not fix it. Any help!!

Thanks,
 

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It's best to let the GM warranty system work through the issue even though it's a frustratingly slow and tedious process...
 
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