I have a 2005 yukon and my abs light is on and traction control light and service stability message. Along with this on slick ground I cant go over 30 or my back end starts to whip back and forth. This happens on 4x4 or in 2 wheel. I've been looking around on the net but I'm new to tahoe/yukon and chevy in general. Any help please. I also noticed my rear air will only blow cold air and not hot but front air will do cold or hot. Please any help thanks a lot.