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:
Delayed Door Lock
When on, this feature will delay the locking of the doors until five seconds
after the last door is closed. You will hear three chimes to signal delayed
locking is in use.
Pressing either the pow ...
Recommended Fuel
If the vehicle has a V6 engine,
use regular unleaded gasoline with
a posted octane rating of 87 or
higher. If the octane rating is less
than 87, an audible knocking noise,
commonly referred ...
Keyless Trunk/Liftgate Opening
Press the trunk/liftgate release
button located above the license
plate to open the trunk/liftgate if the
keyless access transmitter is within
range. See Trunk (Sedan, Coupe) for additional
...