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:
Towing the Vehicle
Notice:
To avoid damage, the
disabled vehicle should be towed
with all four wheels off the
ground. Care must be taken with
vehicles that have low ground
clearance and/or special
equipment ...
Maintenance Replacement Parts
Replacement parts identified below by name, part number, or specification can
be obtained from your dealer.
...
Maintenance Requirements
Notice: Maintenance intervals, checks,
inspections, replacement parts, and
recommended fluids and lubricants as
prescribed in this manual are necessary to
keep your vehicle in good working conditi ...