I am having the exact problem, along with my tow/haul won't come on unless I put it all the way down into first, and pull back on the shifter while pushing the button. Also I am having the typical fuel gauge issues. From what my friend (master tech at nissan, not gm, but still smart) says that the gauge cluster itself has had issues with cross feeding. So I would try replacing the whole gauge cluster itself. I would tell you if it worked or not on mine, but I haven't had the money to get a new cluster yet.

 

Crazy cuz mine is doing the exact same thing as OP,it's annoying as **** and I've been told to check the "junction box" where the lights plug into behind the bumper but that wasn't the problem in my case. I'm hoping someone else chimes in with some answers cuz I can't figure it out.

 

You have a broken wire in the harness for the tow/haul switch. If you remove the clamshells, you'll see the broken wires.

You can try to repair/patch them, but they're very fine wires and usually break again soon. I usually recommend replacing the shift lever/switch/harness piece for a more permanent repair.