The mid-size sedan's mid-range SV trim also adds a Special Edition package to help it align with costlier models.
The wedge-shaped concept caught fire while it was being transported from this year's Pebble Beach Concours d’Elegance.
The Sierra EV is mechanically identical to the Chevy Silverado EV, but style and luxury look to set it apart.
GMC's full-size SUV also has a restyled interior that gets rid of the push-button shifter and adds a huge 16.8-inch touchscreen.
Bad weather didn't slow down this year's event, which included everything from classic Dodge Challengers to a two-tone Citroën to kei trucks.