DPF full error and cannot initiate a regen.

I did take your advice. Bad wire or sensor. If I knew what exactly was wrong, which wire or bad connection to look for then I would not have asked . There is a whole lot of electrical crap in the truck and I know squat about mechanics . The display going on and off, the def guage, and the dpf error...
All I knew was the guy caused it and it was likely a connection issue.
I still can't fix it since it will require a electrical expert to find a bad wire in all that wire.
But since you narrowed it down to most likely the pressure sensor area, at least I can look.
Still yet, delete was my plan when I bought it. Also the only way I can ever put a pto on it.
But I really have had no big emissions problems. A bad def sensor is all. That is not bad for 500k miles.
And yes, thanks for the advice

 

I took it to Peterbilt on my way home from Iowa. I figured codes would be stored. They said none were there. Seems odd that it would not store a code. But then he said no active codes were there. So maybe there were inactive codes since the light was not on at the time.
I'm on my way back to the shop so mechanic can pop out and take a quick look at connections. He knows what he unplugged etc... If that dont help I'll have to go somewhere else that has a computer that will hook up to my truck. His won't connect to it for some reason. I tried checking connections myself. Did not find any loose ones. Might be that dpf pressure sensor goodysnap mentioned. I might need a tech to drive with me so he can read the codes while they happen. ="loudtom, post: 11643949, member: 186442"]It might not be electrical, either. This is something that you try to do yourself to save money before you take it into the shop. Visually inspect the connections for corrosion and make sure they're all secure. Inspect the wire for any breaks or missing insulation, or areas where zip ties might kink it too much. Check the plugs and pins to make sure they're connected properly. Find a helper to watch the DEF gauge while gently wiggling the wires to see if it drops to zero. If you know how to use a multimeter, even better.

By deleting the system, you might only be masking another issue with the truck. It could be a number of other things, like injectors or EGR. But I guess it would be easier to just delete it, and then blame the guy who deleted it for doing a hack job if that's the case.[/QUOTE]

 

Well mechanic told me that the dpf pressure sensors tend to get condensation built up in them and cause problems. So I am going to pull both of them and check for water. If there is any I will put in new ones and see if that fixes it.
Then still needs to go to shop to find wiring problem to fuel pressure sensor. Fine when it is connected. 4.5 mpg when it shorts out.

 

I believe it is fixed. Drove about 30 miles bobtfil and another with trailer . No problems.
Got lucky and that shorted wire for the fuel pressure sensor has stayed connected good. Won't last long though .

Getting up to 11.3 mpg bobtail and about 8.8 to 10 with empty trailer .
This truck does great on fuel when it is working right.

 

Lasted 1 week and back to same. So far no luck figuring it out. Full of inactive codes. Codes for all kinds of stuff like ecm electrical connections and a bunch I forgot what they were. Guy deleted them all and I test drove around for about 15 miles with no problems. Then decided to delete the thing. Guy tried running software on it but ecm would not take it.
I left and problem started again.
So I will be heading to another state to put it in shop and have someone physically inspect it and find the problem

 

So I took my truck to another shop . They said it was a hi pressure fuel pump. Replaced that and the fuel line. Probably fuel line was damaged trying to get it undone, don't know.
Any way I drove truck about 20 miles, no problem. Parked , came back a couple hours later and code pops up. Tech checks it. I have him delete the codes . Drive back home and no codes so far. hopefully stays that way. But if not I will take it back to that shop as I think they do a good honest job. First place that actually took truck in shop and tried to figure it out instead of just looking at laptop and saying ' I don't know what is wrong '

And by the way, the guy that thought he could delete the thing messed up my software. It was up to date when he got ahold of it. It was out of date when I took it to the shop that fixed fuel pump and also loaded correct software.