chrisbusnut
Member
So I have had this strange vibration/buzzing like noise coming from what sounds like the rear underside of the vehicle. It happens when accelerating from low speeds as the RPMs get to about 2200, usually shifting from 2nd to 3rd gear. The noise sounds like part of the exhaust vibrating on a heat shield, or something like that. After 3 trips to the dealer, during which I was able to duplicate the noise for the service manager (he acknowledged the noise), it was supposedly traced to the transfer case. I had been driving in Auto mode, and was told that when they switched it to 2WD mode, that the noise immediately went away.
They told me that I should always drive in 2WD mode, unless I'm in a situation where I may need 4WD. I'll admit, the noise is either greatly reduced or gone altogether in 2WD mode, but I'm having trouble buying that I shouldn't be driving in Auto mode. I also have a 2020 Sierra HD Duramax that I exclusively drive in Auto mode, and I've never heard this type of noise from that vehicle or any other current body style Tahoe, Yukon or Suburban that I've driven.
Has anyone else experienced a noise like this, and is the dealer jerking my chain when they tell me to only drive in 2WD? It sounds to me like they don't want to address the real issue.
They told me that I should always drive in 2WD mode, unless I'm in a situation where I may need 4WD. I'll admit, the noise is either greatly reduced or gone altogether in 2WD mode, but I'm having trouble buying that I shouldn't be driving in Auto mode. I also have a 2020 Sierra HD Duramax that I exclusively drive in Auto mode, and I've never heard this type of noise from that vehicle or any other current body style Tahoe, Yukon or Suburban that I've driven.
Has anyone else experienced a noise like this, and is the dealer jerking my chain when they tell me to only drive in 2WD? It sounds to me like they don't want to address the real issue.
