I've had the same rough idle issue for a year. Every time I take to Van Chevrolet in Scottsdale for any service I complain about it and every time they say there are no error codes. I've printed out the TSB to show them tomorrow when they replace the warped windshield cowl. This is the first Suburban I've been disappointed in; I've had an '03, '07, now this '15. Too many issues that they say are within specs.
Anyone have problems with the heated seats not warming?