NHTSA Complaint #11510368 — 2013 LEXUS GS

When driving at highway speeds for more than 10 minutes the steering becomes increasingly stiff until it starts locking the wheel in position. It takes quite a bit of force to get it to unlock and then whatever new position it's in it will lock that new position. It will lock in a straight line or in a turn so I could let go of the wheel and it will keep turning. This leads to a potentially dangerous ping ponging back and forth until I get it to lock in a position that matches the road to stay in my lane. If I slow down to below 40mph it resets back to a normal steering feel until I speed up again. The alignment and wheel balance are both good. The suspension components are not warn out to cause a change in alignment. The car does not have lane keep assist or anything that might do that on purpose. It seems quite a few other people are having this same issue and dealerships do not seem to know what it is or how to fix it. Some people have had success with replacing the steering rack and associated control unit. No warning lamps or messages appear when this happens and the steering feels perfect at lower speeds and at higher speeds for short durations. This is only a problem when I drive on the highway for an extended period. Some people think it is heat related but it happens to me in the winter as well.