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:
Removing and Replacing the
Floor Mats
1. Pull up on the rear of the floor
mat to unlock the retainer and
remove.
2. Reinstall by lining up the floor
mat retainer opening over the
carpet retainer and snap into
position.
3. Ma ...
Engine Compartment Overview
A. Engine Air Cleaner/Filter.
B. Power Steering Reservoir and Cap (Under Engine Cover).
See Power Steering Fluid.
C. Engine Oil Fill Cap. See Engine Oil.
D. Engine Oil Dipstick (Out of ...
Security
OnStar provides services like Stolen
Vehicle Assistance, Remote Ignition
Block, and Roadside Assistance,
if the vehicle is equipped with these
services. OnStar can unlock the
vehicle doors r ...