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:
Automatic Fold and Tumble Feature
The transmission must be in P (Park) for this feature to work.
WARNING
Automatically folding and tumbling the seat when someone is sitting in the seat,
could cause injury to the person sittin ...
Dolly Towing (All-Wheel—Drive Vehicles)
All-wheel—drive vehicles should not be towed with two wheels on the ground.
To properly tow these vehicles, they should be placed on a platform trailer
with all four wheels off of the ground or ding ...
Storing a Station as a Favorite
Stations from all bands can be stored in any order in the favorite pages.
Up to six stations can be stored in each favorite page and the number of
available favorite pages can be set.
Storing S ...