Use an OBDII scanner to find out what are the codes so that you can understand exactly where the issue is coming from. Almost looks like the engine computer is detecting some mis-firings (or a catalytic converter working at below specs) and is turning off the SH-AWD. Misfiring don't have to be noticeable for the engine computer to detect it and once they repeat enough times, the computer will turn off the SH-AWD.
Ever figure out what the fix was? My car is starting to do it intermittently. Seemed to do it only when it was really cold outside. Now it's doing it even in the warmer temperatures. Thought it was gas cap. Seemed to fix it self shortly after I would click the gas a few more times. Bought a new cap and it still does it.
Was a new EGR valve the fix for yours? Checked the manifold ports and they're clean. Hate to buy a new EGR valve and that's not it. So hard to diagnose an intermittent light.
2011 Pearl White MDX Advanced
... OEM towing, 20 mm wheel adapters,
... rails/crossbars, black wheel well trims,
... side windows acrylic deflectors,
... Michelin Latitude Diamaris HP 285/45R19,
... Full size spare tire,
... 6000 Kelvin HID's
2010 Acura TL Tech.
2001 Mercedes ML 320
2005 Mercedes ML 500 AMG Package