[IndianaNathan]

Hello all,

I own a 2017 Cadillac ATS 2.0L Turbo AWD that has developed a shudder when driving at certain low speeds. If I hit 25mph, 35mph, or 45mph, the car shakes/vibrates for a few seconds then stops. I can best describe it as feeling like when you run over rumble strips before a construction zone.

I had bad tires on the car and got a full new set, but the problem persisted. I took it back to the tire installers and they checked everything over and said there was nothing they saw that could be causing it. I then took it to a different tire place and they inspected it further and said that two of my rims were bent. Since I had just dropped quite a bit of money on a full set of tires, I lived with it and waited a couple months, then finally had the rims straightened this past week.

The problem is still happening. Straightening the rims has helped some, in that it doesn't do it as bad, or for as long, as it did before. Deep down inside I knew straightening the rims wasn't going to fully solve it, and I was right. It helped, but the problem continues.

I'm now completely at a loss as to what the issue is. I've had others check things like wheel bearings (they're fine and make no noise), joints (they are also fine), shocks (also fine), struts (also fine), yet the problem is still happening.

My most recent guess is that it is something to do with the Stabilitrak system, and overall traction control. If it is Stabilitrak related, I know that is going to be costly. At one point I looked in to just trading the car, but APR %'s are ridiculous right now and the dealers I talked to all required $7 -10k as a down payment, which I don't have and shot the idea of me trading away the problem car. I have to live with it, and have been living with it, but I just want a legitimate answer so I can get a real fix since I am stuck with the car.

Any suggestions or advice would be helpful. I just want to be able to drive to work and back and have a smooth ride, with no rumble-strip feeling shudders for no reasons!