See also:

Treadwear
The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course. For example, a tire graded 150 ...

Ultrasonic Parking Sensor Light
This light comes on to indicate that there is a malfunction in the system. See your dealer for service. See Ultrasonic Parking Assist  and Driver Information Center (DIC)  for more infor ...

Reporting Safety Defects to General Motors
In addition to notifying NHTSA (or Transport Canada) in a situation like this, please notify General Motors. Call 1-800-521-7300, or write: Buick Customer Assistance Center P.O. Box 33136 Detroit, M ...