WhatEverLolaWants

Maybe I just never noticed it before, but my c6 doesn't do it.
On the highway, when I hit a bump or cross the crown in the road, my c7 rocks back and forth (a little). It is enough to cause the steering wheel to move left and right maybe a half an inch. On some roads it is sever enough to cause my wife to complain of motion sickness. It is better (but not eleminated) if I put it in sport or track mode.

Any ideas as to what to look at. ?

dbirdhouse1

That's a first...sounds like you have the mag ride so its complicated enough to enlist the help of a professional. Sorry I can't offer more. Have you pressed and released on the car to check how quickly the shocks return the car to correct height, any bouncing?

Vette Ski

Year, miles, how it was used, accidents ?
Rich

RonC7

Try setting steering to TRACK all the time to reduce the power steering assist. It will calm the car down quite a bit Beyond that it may be an alignment issue.

Ron

ArchitectMike

I also set my steering to "track" and the car is arrow-straight. Alignment (as noted earlier) is critical, too. If you have mag ride, you might consider the software update. That made both touring and sport modes a much more comfortable ride.