Havasubum started following Yukon xl or a suburban?, Whats the deal with the 8 Speed transmission problem?, 2016 Yukon Denali - should I buy? and and 5 others
I just got my 2017 Denali with the 8 speed trans back from the dealer. They changed the valve body and installed synthetic ATF. I hadn't been experiencing the shudder (torque converter) but the 1-2 shifts both up and down were enough to piss off the Pope. I'll let you know how it does after a put a few miles on it. BTW, I had to do a full court press with the dealer (who I've bought several cars from) to get them to do anything. The service advisor said other customers were satisfied with the fix. We'll see. I wonder if the new C8 8-speed will have similar problems. Good luck to all of you.
I have noticed the same "creaking" issue at times in the driver's seat. It feels like the springs or the heating element is rubbing agains the seat cushion. I haven't noticed movement like the NHTSA notice states. Also, it looks like it is only for 2014 models.
I searched for a while I couldn't find this article anywhere on this site. It is dated August 13, 2019 and outlines a TSB fix for the troublesome shifting of the 8 speed transmission. My Denali is driving literally crazy with the hard up and down shift between 1 & 2. It also addresses shuddering, which I haven't experienced. I hope this works because I was about to get rid of it.
Try calling GM Customer Service. Dealers are terrible with explaining features. It's not that hard to do. I also noted that the owner's manual doesn't cover this feature. My 2017 has 3 seat buttons. The third button sets the position of the driver's seat when the car is turned off.
GM has taken care of me over the years. They replaced the grille on my 2008 Yukon when it was 1 year old and replaced a delaminating steering wheel on my 2011 Denali. They are now replacing a door trim part that is failing on my 2017 Denali. All of these occurred without argument.
Could it be a bad ground?
I switched to a Yukon because bottles of water and soft drinks would often exploded from the heat when transporting them in the bed of our pick up when traveling to Lake Havasu AZ in the summer.
That certainly is not my experience. When gradually braking for a red light it does slow down significantly when downshifting to the point I have to lift way off the brake and creates an uncomfortable ride. Also, when I manually shifted to the lowest gear in heavy stop and go traffic, it would not shift and stay in first gear. Second gear is as low as it will go. The harsh upshift and downshift continued.
The Ford/GM 10 speed trans is a much better transmission. I have had my 2017 Yukon Denali in to a very good dealer twice. They found an obscure computer program and reflashed the computer. It had to go through a whole new learning period. As time went on I'm right back to where I was before. There are times when I make a slow left turn without stopping and slowly accelerate up a short street that has a steep incline. As I feather the throttle up the hill, it slams into first gear so hard our heads hit the headrest. Once, while driving in a busy parking lot, as traffic started moving, the trans shifted unexpectedly into 2nd causing the truck to lurch forward. I could have easily hit the car ahead if I didn't hit the brakes quickly. Also, I often drive on a highway with a 55mph limit and several signal lights. When a signal far ahead turns red I slowly decelerate. As I get to the light the trans drops harshly into first causing me to let off the brake and making the stop real sloppy.
It's not the brakes. It is the crappy 8 speed transmission. Mine does the same thing. I was recently stuck in stop and go heavy traffic. The transmission jerked when I took off and jerked when slowing down. If you don't come to a complete stop and slowly accelerate, it can slam my head into the headrest. Unfortunately, there is nothing your (or I) can do about it.
I have a 2017 Denali and have had since new. I noticed that lately the HVAC blower fan cycles on and off while the truck is turned off, just after driving it. Does anyone know why this is happening. I've noticed that the amp meter is charging more and not dropping down like it used to when the truck is new. I was wondering if the battery is circling the drain and not providing enough amperage. I also noted that after the truck was parked for a couple of weeks, the compass settings on the Navi changed. Thanks in advance for the help.
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