I re-installed my quad xzt box two days ago. Yesterday I thought I noticed a little more injector rattle. This morning when I left for work my truck started bucking and farting and burping black smoke under acceleration around 2k rpm. I stopped on the side of the road and pulled the box off and used the by - pass plug it came with, so I could leave the harness there. I called the delaer while I was driving and asked them to ready the diesel tech who recently replaced my #6 injector. They informed me he was no longer there, and it would be the end of next week before they could look at it because the only diesel tech there was booked through then . So I continued on with my day and it smoothed out after a while. On the last leg of my trip today I stopped and had my bed rail protectors replaced. When I left there to come home it started acting up again and threw a CEL. I got home and did the key trick and the codes I got were P0148 (HPCR Checksum) and P0193 ( Fuel pressure sensor voltage too high). Now the quad harness plugs into the rail pressure sensor, so I took the harness off. Then I drained my fuel bowl just to make sure I didn't get some watery fuel, it was pristine. I just returned from a test drive and it seems ok now. Should I jsut go to an auto parts store and have them clear the codes? Will the dealer be able to tell I have done this? Should I just go to another dealer and let them check it out?

 

I had the same issue a while back. Put dielectric grease on all the connectors and make sure they are clicked all the way together. If the code doesn't clear itself after the next few starts, you'll need to clear it with a code reader.