ok I have one going into mack dealer for im going to say wiring issues (herein referred to as truck 120) its a 2009 mack cxu613 pinnacle mp7... the only codes are mid 128-pid 411-fmi 5; gas diff pressure like challenger said, I tested the wiring unplugged from sensor and I get with key on, one ground, one 4.99 volt, and one 4.75 volt (on signal wire).... 0nly other code is; mid 128-pid 437-fmi 5; aftertreatment injector fuel pressure sensor and get the same reading when I test the wiring one ground one 4.99 and one 4.55..... now the main problem we r having is it goes into shut down mode and even sometimes dies going down the road or at best wont rev up pass 1200 rpm's. yes it will not regen on its own because of the sensor codes.... but I have messed with it and just idling in the yard I set the high idle at 1000 rpm's and the cruise some times will kick out and then by foot you cant rev it up pass 1200 rpm's, so I held the peddle to the floor and 1200 was it no more turned the cruise on/off switch off and it jumped to 2200.... so I did the same thing over 2-3 more times and same out come soon as I turned the cruise off it jumps to 2200.... so I take the cruise switch out and send it to work it runs ok for a couple days then same thing happens but now its in the atc circuit atc light on dash comes on by its self and kills the truck. I had him shut the truck off at the key and wait 20 seconds and start it back up and it runs good for 50 miles then atc light and power reduction...... I have reprogramed the ecm and updated it also.each time it gets to the yard says the soot level is 50-75% never more then 75% ive done force regen and it goes down but don't help the main problem. now to my credit I just got my tech tool working right I had to delete the program off my computer twice and reinstall it but its finally working OK still not good but ok but I just found the 2 codes yesterday and while testing the wiring at the sensor the codes went inactive....wiring?....now the truck has no active codes and still same thing with cruise on wont get over 1200 rpm's