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:
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Engine Oil Life System
The engine oil life system calculates engine oil life based on vehicle use and
displays a DIC message when it is necessary to change the engine oil and filter.
The oil life system should be reset ...
Safety System Check
Now and then, check that the safety belt reminder light, safety belts,
buckles, latch plates, retractors, and anchorages are all working properly.
Look for any other loose or damaged safety belt sys ...