2015 Truck 6.2 L Engine, 8L90E Transmission troubles, problems, fixes

[Jerry's Denali]

Update on my 2015 that I replaced trans and converter. It has 17000 miles on it now without a problem, drives great.

However one of my other 2015's that has been great developed issues at 6500 miles and I refuse to fix these on my dime.

I have contacted GMC and the GM pigeons on here with no help at all.

Sad that a $60000 truck will just sit because it is a hassle to drive.

 

I have already purchased a Ford F150 Platinum and so far I like it.

Never thought I would own an F150.

 

 

The local Ford dealer said they have traded for more Sierra's and Silverados in the past 9 months than in the last 6 years, he absolutely loves the GM 8 speed.

 

He also said most trades are from loyal GMC/Chevy truck customers not just brand hoppers, this just shows we are tired of the GM BS.

[MT Groove]

Having these issues with my 2016 Denali 6.2L 4WD. I read through these posts and the symptoms are similar. Mine started these rough upshifts, downshifts, clunks etc at around 650 miles. If it is indeed a programming/software issue, would a reset temporarily fix the issue? Would disconnecting the battery for a few minutes reset it? This is my first GM product so please enlighten me.