My 2014 Ram eco-diesel had the same problem in June 2019. Commuting from work, coolant leaked out, truck over-heated, I had it towed home. I got a quote from Modesto, CA Ram dealership, they estimated cost to be $2700 to $3400 to replace the hose, since they have to practically dismantle the engine, remove exhaust manifold. Well needless to say, I call bullshit. Truck has been sitting since. Sucks! I agree that this is a design flaw and Ram should cover repairs. I do not know where to turn at this point, I can't afford the repairs since I'm paying $600 a month for truck payment and $450.00 for insurance per month.
Also, in April, 2019 truck had a def-pump failure. I ordered the parts and repaired that myself. There is Eco-diesel Class Action Settlement for this and I was paid $2460 for claim. If any of you have experienced the Def service dash light, take to dealer, truck will not start in 70 miles, check out
www.EcoDieselSettlement.com 1-833-280-4748