I bought my 3rd vehicle, a 2016 Titan XD Pro4x Cummins Diesel, from Round Rock Nissan on 7/31/2016. We have had many issues with it.From day one the heated seats have never worked.We have had issues with exhaust fumes in the cab even when the air conditioner is on recirculate,the engine will randomly surge while at a stop, the transmission does a double shift or bucks.The brakes feel soft.The DEF system using lots of DEF fluid.We have had the truck serviced at Round Rock Nissan at least 8 times since purchase for these various issues.Each time they have said they either fixed the problem or couldn't reproduce the issue.January 2017 we took the truck in for an oil change after going to CO.When our truck was returned to us there was wet dripping mud all down the right side, our spare jug of fuel had broken loose from the strap in the front left corner of the bed, up ended and cracked and spilling in the far back right corner as if someone had taken our truck off roading.We had to open a case with Nissan Consumer Services to finally get them to work on the heated seats.That time the truck spent over 45 days in the shop as they tried to replace all of the heating elements.They didn't follow the completion testing as outlined by the specialist tech.Instead they told Nissan Consumer Services that the vehicle was repaired and to close the case.When we arrived, not only did the heated seats not work, but they had also done damage to my vehicle.There were paint scratches, a cracked windshield, and damaged interior panels.There were also several greasy hand prints and the whole truck smelled like an oil lube shop.Because their tech was not able to follow a simple set of diagnostic steps the truck then had to be driven to a different dealership over 90 miles one way from my house.RR Nissan is 47 miles from my house.The other dealership was able to identify the problem, but couldn't fix it either.After spending 18 months trying to fix the vehicle we decided we had had enough and wanted to try to trade it in on a newer model that hopefully would not have these problems.The salesman and sales manager we had worked with at RR Nissan said to bring it in, they would make us a deal on a trade, wanted to make it right.Their idea of make it right was to sell us a vehicle we didn't want, that the heated seats also did not work in or a vehicle that did not have heated seats at all, lower the trade appraisal value based on damages they had done and proposed that we eat over $10,000 in negative equity on a vehicle that has had defects since day one.So we decided to check the vehicle back into their service department as a last ditch effort.We opened several more cases with Nissan CS since we hadn't reached resolution on any of them previously.They had my truck again for 3 weeks.On May 31st we were called by the service manager and told that our vehicle was ready.He said that the entire DEF system had been replaced, all previous damage had been repaired,and that all the other issues had been fixed by programming updates.My husband told the SM that we were on our way to get the truck.When we got there we learned that the SM had taken off for 3 days.When we got the truck there was still damage caused by previous visits,but now there was new damage. We had our service writer document the remaining and new damage. We put about 200 miles on the truck that day.The engine surging is still there, the brakes are still really squashy,the exhaust coming into the cab is worse than before and the transmission is still bucking and double shifting.Now the turbo gauge is jumping around and does not seem to operate normally,and our fuel economy has dropped down from an average of 17-19 MPG to 7-9 MPG. We called the dealership to open a new RO and document all of the issues the truck was still presenting so that it was already in the system when we went to drop it off next.We were called back by the dealer and told that since they can't seem to work on my truck without causing damage that they would like us to stop bringing our truck to them for service.