NHTSA Complaint #11580328 — 2007 GMC SIERRA 1500

I was at a stop light and heard a loud noise like a shotgun blast. I felt a concussion hit me in the chest. I thought I had been shot at, then thought I was possibly rear ended but nobody was behind me. I noticed the airbag light was on, the hazards were on and I couldn't shut them off, and the seatbelts were, and still are all locked. But no airbag deployed. There was a smell in the cab that vaguely smelled like a cross between gunpowder and ozone. It's fortunate that I was not at freeway speed.