Second Generation MDX (2007-2013)
My MDX is 2008 model with 144600 miles.
I got a warning light of SH-AWD after replacing spare tire for few days.
I replaced with a new tire (rear left) but it persisted.
I visited a local Acura dealer (Duluth, GA) and they charged me $192 for SH-AWD system diagnosis.
I guess "TPMS drop to 0"...