rear driver side tire

Are you familiar with the distinct odor of brakes overheating? Is that it?

Cherry, you asked...once we determine whether or not it's brakes or not we can go from there...brakes overheating from a stuck caliper, or like overheated on a big!rig going down a steep grade have a distinctive odor

X2 on tennisshoes answer.

Is the wheel hot? Touch both rear wheels to see if they are the same. The other possibility is that you snagged a plastic grocery store bag on the exhaust pipe.

I have a 2012 Ram 2500 Diesel. It has the same smell coming from the wheel wells too. Was told it is blow by tube that vents from the engine