I recently bought a used 2011 Ram 1500 Laramie with the 5.7 hemi and the 5 function 4wd switch, the truck has 100k miles. Yesterday while driving in 2wd, the "service 4wd" light started coming on intermittently.
The light would come on, then almost immediately go off. this happened several times in a 50 mile trip. Any ideas as to what may be causing this? Should I stop driving the truck until I get it checked out?
Thanks for any info you can give me.

 

Get the codes read, see what it's whining about.