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 
, and an
Advisor can run a check.
See also:
Power Steerin
If power steering assist is lost because the engine stops or the power steering system is not functioning, the vehicle can be steered but it will take more effort. ...
Retained Accessory Power (RAP)
The following accessories can be used for up to
10 minutes after the engine is turned off.
• Audio System
• Audio Steering Wheel (if equipped)
• Clock
• Power Windows
• Sunroof (if eq ...
Front Axle
When to Check Lubricant
It is not necessary to regularly check front axle
fluid unless you suspect there is a leak or you hear
an unusual noise. A fluid loss could indicate a
problem. Have it insp ...