Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems.
It also checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring System.
If a diagnostics check is needed between e-mails, push 
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Advisor can run a check.
See also:
Vehicle Messages
Messages displayed on the DIC indicate the status of the vehicle or some
action that may be needed to correct a condition. Multiple messages may display
one after the other.
The messages that do ...
SUSPENSION MODE TOUR
(CTS-V ONLY)
This message will be displayed
when touring mode is selected
using the Magnetic Ride Control
button in the center of the
instrument panel. See Magnetic
Ride Control for more
information. ...
Storing the Tire Sealant
and Compressor Kit
(Sedan)
The tire sealant and compressor kit
is located in the trunk in one of the
following locations.
A. Tire Sealant and Compressor Kit
B. Foam Container
C. Wing Nut
1. Open the trunk. See Trunk ...