See also:

Trailer Towing (eAssist)
The vehicle is neither designed nor intended to tow a trailer. ...

Cellular and GPS Antennas
Avoid placing items over or near the antenna to prevent blocking cellular and GPS signal reception. Cellular reception is required for OnStar to send remote signals to the vehicle. ...

BRAKE FLUID LOW
This message is displayed when the brake fluid level is low. See Brake Fluid. ...