Unable to Connect to OnStar Message
If there is limited cellular coverage
or the cellular network has reached
maximum capacity, this message
may come on. Push 
to try the
call again or try again after driving a
few miles into another cellular area.
See also:
Additional Required Services
Every 12 000 km/7,500 Miles
► Rotate tires. Tires should be rotated every 12 000 km/ 7,500 miles. See Tire Rotation
.
At Each Fuel Stop
► Engine oil level check. See Engine Oil .
...
Dual Tone Multi-Frequency (DTMF)
Tones
The in-vehicle Bluetooth system can send numbers and
numbers stored as name tags during a call. This is
used when calling a menu driven phone system.
Account numbers can be programmed into the
...
Every Engine Oil Change
► Change engine oil and filter.
Reset oil life system. See Engine Oil and Engine Oil Life System . An Emission Control Service.
► Engine coolant level check. See Engine Coolant .
...