while driving a hissing sound was heard from rear window, smoke appeared and rear window shattered. Dealer states that there was a short in the electrical system consistent with recall # N192220470 and that my vehicle does have RPO A48. My vehicle was not included in this recall due to geographical location of vehicle (Pennsylvania). This is a known potential fire risk and glass shattered into the vehicle. It should be noted that the outside temp was 60 degrees and my husband did NOT turn on defroster or open the rear window. After the smoke clear and window shattered he noticed that the defroster light was on and he shut it off manually. Had there been rear seat passengers they would have had glass on them and subjected to smoke and possible fire. God forbid a child in a rear facing child safety seat was back there, they would have been at serious risk of harm. GM has been notified and at this time is refusing to include this vehicle in their limited scope recall. I know of several others with similar stories (avail upon request), one lives in South Carolina, proving that this recall should not be limited to northern tier states. The current recall must be expanded to all 50 states asap. Lives and property are at risk.