DenaliMan16

Well they replaced the rear shocks and it’s riding pretty close to new. I’m pretty satisfied overall. I still think it’s strange that the tech said there was nothing wrong with the rears and they went ahead and replaced them anyways. Who knows. Maybe it was put into fail safe mode when the fronts went and they never reset it. Anyways I’m pretty happy. I think next round I’ll look into upgrading my tires. Still got another 15-20k left on them. I’ll definitely be keeping an eye of the shocks/ride quality because it does seem like an issue for these trucks.

So they did replace the fronts because they were blown out but maybe they didn’t need to replace the rears and the system was just in its fail safe mode? They were reluctant to do the because they couldn’t find any issues with them. Do I ask them to reset it? Out of fail safe if I’m still feeling the rough ride?

I’ve been documenting everything so here goes. Hoping you guys have some experience and can shed some light. Nov 12th 2016 Yukon XL Denali owner here. About 65k miles on it now. Originally leased then financed it and also purchased the extended warranty back in 2020. Had roughly 50k miles on it then. Riding fine. Once I hit around 60k I noticed it starting to ride rough. Almost jerking out of my seat. Also when I go over a speed bump a notice the rear kinda sways back and forth. Take it into GMC and they replace the fronts under warranty. I asked about the rears but they told me that they were fine and they typically don’t have an issue with the rears unless you are doing heavy lifting. They also replaced both TVs and a hose covered under warranty. I got it back after a week on Tuesday. I was expecting to be riding on a cloud but to be honest, I can hardly tell that new shocks were installed. It’s still rough. And I took it over a few speed bumps. Same issue with the swaying back and forth. I thought I would perhaps give it a few days but I’m truly disappointed. Nov 30th Well apparently there’s nothing wrong with it. I took it back to the dealership and the service guy just called. Said he and the tech just took it out for a spin and it drives “fine”. Rear shocks are in good condition according to them. They say it’s a truck and drives that way. I ****** you not. It’s never driven like this before. Bumpy as hell and sways back and forth when you go over a speed bump. I’m going down there now to take a ride with them Dec 1st *** Update**** So the Service rep and tech were adamant that my truck rides “fine”. I went down there yesterday and they had me take a test drive with the tech. I went over the same speed bumps they did. Mind you they are tiny speed bumps in a parking lot. First one I went over. Fronts go over fine, rears I drive over slow and as soon as it comes down it rocks back and forth. Look over at the tech -“ did you feel that?” He says “hmmmm kinda “ Next speed bump I go a normal slow speed over it. Rocks even more ! “I know you felt that ! “ he says “ yep definitely” “Now take me to the road you drove it on, I need to get it up to at least 40-50” Takes me to a mildly rough road. Truck is jerking, throwing us around “ He finally agrees that it drives like ******. Now he tells me that the only issue is that the GMC inspector might not sign off on the work. He’s going to double check everything suspension related, put the order in to replace the rears but if the inspector doesn’t see a failed part then he probably won’t sign off on it..... I’m beginning to think that there is a known issue that GMC isn’t admitting to. The saga continues ... Today Dec 2nd ***Update*** GMC Dealership is installing new rear shocks today even though they can’t find anything wrong with the existing rears. Should get it back today! Crossing my fingers but not holding my breathe.