Line, Diesel Exhaust Fluid Supply: Description
WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Diesel Exhaust Fluid (DEF) supply line supplies fluid from the tank to the pump and has connectors similar to fuel lines. The line also incorporates a heater to keep the DEF fluid from freezing. The DEF supply and return line heater also share the same wire harness connector.