New 2015 Yukon XL. Just about 1000 miles. Usually drive in 2L although it was in Auto when I bought it. (I actually read the manual and it said 2L offered the best fuel economy so I stick with it in dry weather. Has no impact on TC or Stabilitrak.)
So it was a bit slushy out this morning so I decided to switch to 4Hi. According to the manual you can do this on the fly (I did it at a red light away) and it makes no reference to speed restrictions like 4Lo.
My expectation was there would be a little more "noise" in the mode but.... holy cow. As soon as I turned into a parking lot I thought my drive train was grinding apart. The more I turned the wheel the louder and "crunchier" it sounded. I was like WTF? I switched back to Auto and the sound and wheel resistance on turns went away.
This can't be right, I thought. If something is wrong when the front differential is engaged, and Auto engages it as needed without the grinding sound, how do I know Auto is actually doing anything? So I hit the Internet. Finding this thread from Dec. was encouraging as it sounded like a similar, if not the same, issue.
@Daunntlessone, did this get worked out for you? Is the noise still pronounced enough that it would make you think something is wrong? Did it get louder and harder to turn the more you turned the wheel? I don't buy the dealer saying "that's normal". That is their stock answer until a recall appears because there really was something wrong and now the warranty repair needs to kick in (which is money in their pocket too).
I'd rather they not operate on my "patient" in the first place unless I know they have to. Too many experiences where it goes in for one thing and comes out with two others.
plus all 2015D have to have evacuate the freon and recharge the system, replace one of the lift gate bottles .
