OnStar Overview
EmergencyVehicle Identification Number (VIN)
This legal identifier is in the front corner of the instrument panel, on the
left side of the vehicle. It can be seen through the windshield from outside. The
VIN also appears on the Vehicle Certification and Service Parts labels and certificates
of title and registration.
Engine Identifi ...
Tire Messages
SERVICE TIRE MONITOR SYSTEM
This message displays if there is a problem with the Tire Pressure Monitor System
(TPMS).
TIRE LEARNING ACTIVE
This message displays when the system is learning new tires.
TIRE PRESSURE LOW ADD AIR TO TIRE
On vehicles with the Tire Pressure Monitor System (TPMS), t ...
Tire Pressure Light
For vehicles with the Tire Pressure Monitor System (TPMS), this light comes on
briefly when the engine is started. It provides information about tire pressures
and the TPMS.
When the Light Is On Steady
This indicates that one or more of the tires are significantly underinflated.
A Driver In ...