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 call again or try again after driving a to try the call again or try again after driving a few miles into another cellular area.

    See also:

    How to Check Lubricant
    To get an accurate reading, the vehicle should be on a level surface. A. Fill Plug B. Drain Plug When the differential is cold, add enough lubricant to raise the level from 0mm (0 in) to 3. ...

    Engine Compartment Fuse Block
    The Engine Compartment Fuse Block is located in the engine compartment, on the driver side of the vehicle. Lift the cover for access to the fuse/relay block. If the vehicle is a hybrid, see the h ...

    Cellular and GPS Antennas
    Avoid placing items over or near the antenna to prevent blocking cellular and GPS signal reception. Cellular reception is required for OnStar to send remote signals to the vehicle. ...