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No fix for dpf issue?

I have a 2014 pete 330 with a paccar. For the last 4 months I have been fighting this truck to keep running. It spent 1 month at a local shop replacing parts on the after treatment system with no luck. It would drive 20 miles then derate and give the same src codes. Then I took it to peterbilt, they said it needed all the same stuff that was already replaced. They did some computer updates and still no fix. Then it went to cummins who had to run the same tests that the other two shops had already done. They decided to replace the batteries and it worked, so I thought. $8k later and my truck was back on the road. Two months later the same code came back. My warranty is up due to hours on the engine. Truck has 70k on it. The codes are all dpf\scr system related.

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So another $1000 spent and all that's left is replacing the scr. Cummins quoted me 5k for the job, with no guarantee it will fix the issue. I have decided to cut my losses and trade this truck in as is. Sorry I don't have the definate answer for my fix.

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what paccar it is?

i owned PX paccars, and they were cummins engine (isc, isb).

mx engines are paccar genuine engines.

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Why would you take a paccar engine to Cummins they have no way to work on a paccar. That's the biggest reason I wouldn't own one cause you would have to go back to dealer. Plus some parts on paccar engine aren't able to be rebuilt. I am not sure what to say other than your probably have to go back to kennworth or peterbilt and hope they can find the problem. I have 2011.5 Pete with a Cummins and I've never had any problems that Cummins didn't find first time in Shop.

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The problem is even if you find somebody with the same problem it can be caused by different parts of system and still have the same ending symptoms that your having

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The dealership suggested it go to Cummins supposedly the after treatment system is made by Cummins. Also I have been told that PACCAR is basically a Cummins motor. Not sure how accurate any of this is but if the dealer in Sacramento couldn't fix it then obviously I need to go somewhere that will. I appreciate your advice however im looking for someone with similar problems or fixes not shop redirection. Thank you

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In all fairness , I do not own a paccar or cummins, but a selling point when I spoke to Pete and KW sales guy's they were telling me I could take paccar engine to kw,pete or cummins shop. I hope you get it corrected.

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I am not sure who's giving you this bad information but I just talked Cummins and they have no way of working on a Paccar engine or dpf or scr of that engine so your stuck with kenworth or peterbilt only.

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The salesman in Amarillo & Tulsa, told me. I am glad to know that! Thank You. I cannot say I am surprised.

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So I spoke with the general manager at cummins in sacramento today. He said paccar motors are in fact cummins engines. Paccar buys them in bulk cheaper from cummins and slaps their name on it. The after treatment system (dpf/scr) are made by cummins with some paccar wiring harnessing. So it's going back to cummins monday. Supposedly the codes coming up now are possibly due to bad def. The whole system was cleaned and def replaced so I doubt this is the answer. They are also going to change the perameters for the regen operation so it will work even with pto engaged. More to follow

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You must have px model instead of mx model

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