I have a 2017 Silverado LTZ Z71 with 17,500 miles. I recently started experiencing very similar rumble strip type vibration at freeway speeds. It happens intermittently when going up a slight grade and/or gently depressing the accelerator. I was driving up a steep grade recently and it shook violently - like somebody was rocking the vehicle side to side. I checked 2X2 position, downshifted to M3, and still rocked - although slightly less violently. It also seemed to lose power.
Does anybody experience rumble strips type vibration in the steering wheel at highway speed AND when driven it up a steep grade experience a violent rocking of the vehicle?
Was it resolved and if so how?
First time the dealer did a wheel balance - I had not yet experienced the issue with steep grade which obviously would not be a balance issue. They said most of the issue was mostly resolved and to drive it for a while. It was not any better. Since then, I experienced the steep grade violent shaking experience. Something is seriously wrong. I cannot trust the vehicle to drive over a hill much less tow something uphill. Now it is back at the shop as I write this. They called saying no problem could be found. After explaining again and pleading my case, they asked me to authorized an extensive test drive overnight. They say GM has nothing on this type of issue.
The first step will be getting the dealer to admit there is an issue.
Thanks for any help pointing me in the right direction.
