See also:

Add-On Equipment
When you carry removable items, you may need to put a limit on how many people you carry inside your vehicle. Be sure to weigh your vehicle before you buy and install the new equipment. Notice: Overl ...

Engine Power Messages
ENGINE POWER IS REDUCED This message displays and a chime sounds when the cooling system temperature gets too hot and the engine further enters the engine coolant protection mode. See Engine Overhea ...

TTY Users
OnStar has the ability to communicate to the deaf, hard-of-hearing, or speech-impaired customers while in the vehicle. The available dealer-installed TTY system can provide in-vehicle access to all of ...