Bought a used 2016 big horn about 6 months ago, was a leased vehicle high mileage close to 90k, but for a diesel that should be no big deal. Salesperson never mentioned a class action of course. We used it for around town and tow a 5500# travel trailer. Towing or not, it knocked! Sometimes loud, sometimes not, around 2500rpm. We thought it could be the fuel, tried additives; sometimes it knocked sometimes not. Dealer said "I don't hear any knocking". Then they did the FIX; slightly worse fuel economy right away. Spouse was on the freeway and it would not move, holding up traffic crawling in the slow lane on a hill. Later I was driving up a hill in a neighborhood doing about 20mph; it started knocking SO loud then dash error "oil pressure too low" and it shut itself OFF. I started it, it shut down, waited a few minutes, it started and got home. Had it towed to dealer, they said "what error ? It's running for us?" More errors, engine lights on. Dealer finally tried harder and found a couple parts to replace one being some valve leaking having to do with oil pressure. This part needed is supposedly no where to be found and is backordered for unknown length of time. We did not feel we could do any of the suggested un-fixing on our own, and didn't want to risk blowing the extended warranty so it seemed the only option was to ditch it on the dealer and trade for a Hemi. I would really like to know if anyone has had the FIX and the truck is gloriously serving its owner?