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If your radio has the onstar capability, gm has issued a recall for the issue. If not, check the fuses to see if the display fuse is different than the actual radio fuse in your owners manual. Many new, especially "touch screen radios", connected to onstar for navigation have a tendency to freeze up or not display and gm will fix it for you as they recalled over 50,000 vehicles for it.
here are two definitions. First: ignition coil module 4 times ref circuit intermittent no pulses. Second: Distributorless ignition system 4 times signal interrupted. You will want to inspect the spark-plugs, spark-plug boots, Coils for defects. Let me know how it goes.
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