Leeroy

Dodge says this module is in the left side rear interior plastic panel , beside 3rd row seat, 

After calling several wreckers about these AWD ECC couplings (they think its a fluid filled viscous unit which is why they want to sell with diff) however they are supposed to be dry inside, the reason they fail is pinion seal leaks diff oil into elect. clutch coupling . there is also an O ring around pinion housing that should be changed at same time as pinion seal.

the seal is $55. ,O ring is $10. from Dodge. dont try and use a cheap generic O ring cause this one is a special size. I found a good ECC for $900. better than $2500. from Dodge.

I suggest anyone with an AWD journey monitor any sign of oil at front of diff get that coupling off ,replace pinion seal and O ring BEFORE it takes out ECC !! 

I have same problem with my 2015, however lots of conflicting info on this coupler, I have read they are actually dry inside ( no oil ) , its the pinion seal that leaks oil into the coupler to ruin it, there is no way to add oil into coupler and it appears separate from diff, any Dodge techs on here know for sure?