Nissan titan xd cummins

I have a 2016 titan xd with a 5 L cummins. When I hooked up my hpv12 to it only the tach and ect worked. If I buy 4 credits, will I get full function on all level to check codes and write changes?
I need to check codes, add fuel at cold weather start up and check soot loads in the dpf. I know these trucks are rare and Nissan has stopped making them but I would like to be able to tune this engine and possibly the trans.

I don't see the Nissan Titan Diesel as a supported vehicle.

On many vehicles there will not be many supported parameters and there is nothing else you can do about that. It's up to HPT to add support if they wish to do so.

They have the right year of titans listed but no xd. I was hoping that they might have the cummins covered. Maybe not. Thanks