Code P064, Vehicle Acceleration Too High: Notes
WARNING: This page is about a different car, the 1995 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
Code P064 will set when vehicle speed is increasing at an extremely rapid rate (wheel spin). This code is a protective measure to disable cruise control when vehicle suddenly accelerates, for example, travel on icy roads.