Technical Bulletin (Power Steering Rack Vibrations in Steering Wheel):
This document informs that After a short stationary period (sometimes as little as a few hours) flat spots can develop after the warm tire has cooled down. The effect the flat spotted tire has on the vehicles performance depends on the type, dimension, make, and pressure of the tire.
Flat spots alter the radial force fluctuation and must be driven out before balancing the wheel. This document discusses the "Fault Codes" necessary to diagnosis, and potential remedy of the issue. The fault codes for checking warranty coverage for servicing the vehicle are also available.
