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:
Theft-Deterrent Feature
The theft-deterrent feature works by learning a portion of the Vehicle
Identification Number (VIN) to the infotainment system.
The infotainment system does not operate if it is stolen or moved to ...
Storing a Flat or Spare Tire and Tools
Storing a jack, a tire, or other equipment in the passenger compartment of the
vehicle could cause injury. In a sudden stop or collision, loose equipment could
strike someone. Store all these in t ...
Treadwear
The treadwear grade is a
comparative rating based on the
wear rate of the tire when tested
under controlled conditions on
a specified government test
course. For example, a tire
graded 150 ...