Re: Really weird...
It could be a leaking hose. Same thing happened to my Riviera.
The light came on only after driving for awhile, then when stopped at a light it just stalled. No rumbling or shaking just stopped working, like a Prius at a stop.
Online research led me to a hose leak lead. YouTube diagnosis and repair vids mentioned the car will stall and it will be a rare occasion.
I hope this helped.