Defroster/defogger/hvac System Rear Window Electrical Heating Element problems of the 2015 GMC Sierra 2500

The contact owns a 2015 GMC Sierra 2500. The contact stated while driving 35 mph with the rear defroster activated, there was smoke coming from the window before the window cracked. The contact had taken the vehicle to a certified mechanic who determined that the rear defroster needed to be replaced. The vehicle had not been repaired. The manufacturer was made aware of the failure and confirmed that there was no recall or warranty coverage for the repair. The approximate failure mileage was 131,000.