Grade Brake Malfunction

[Silverado Jones]

Two week old, 850 miles, Silverado 2500 4x4, has a grade brake with an indicator light. The grade brake is coming on automatically with no indicator light causeing rpms to jump to 4000 when slowing down. Can't get to dealer for a week, is there a fuse that can deactivate the grade brake?

[newdude]

Grade brake is a normal function (D or tow/haul its always working). Hold tow haul for 5-10 seconds it turns it off.