See also:

Warranty
OnStar equipment may be warranted as part of the new-vehicle limited warranty. The manufacturer of the vehicle furnishes detailed warranty information. ...

SERVICE BATTERY CHARGING SYSTEM
This message is displayed when there is a fault in the battery charging system. Take the vehicle to your dealer for service. ...

Engine Coolant Temperature Warning Light
For eAssist vehicles, this light comes on briefly while starting the vehicle. If it does not, have the vehicle serviced by the dealer. If the system is working normally, the indicator lig ...