Check engine light on cummins isx 2012 peterbilt

Have 5 2012 peterbilts all with dpf and the one i drive has thus far been good until now cel came on took it in and got 3582 was told there could be a couple things but had a tree they have to follow but in my experiences that says hey throw money until we say stop was wondering if anyone could point me in a direction as i am mechanically capable of most repairs had the filter serviced and all done about 15,000 miles ago the truck has 450000 on it as the others but im thinking its time to do a little cleaning and some sensor replacement can anyone help me out

 

Fault code 3582 is SCR catylist efficiency low, moderately severe level. The first thing I'd check is if the DEF doser is plugged up. It's a good idea to pull it off and clean it once a year.

 

Ok great heard a rumor of that as well any way you could tell me where its located or a pic diagram im still a bit of a rookie

 

I am assuming that you have not had the scr replaced at all in the trucks life? 2010 emission Cummins engines had a slight issue with the scr degrading over time. I would call a Cummins Dist. and ask them about the SCR getting replaced with the newer version and if it is covered under warranty because you are going to have to, just a matter of time.

The part that GrapeApe is telling you about is located on the decomp tube. This will be between the DPF assembly and the SCR. If your truck has the aftertreatment system under the right hand side of the cab under the step then it (if you trace it from the end of the exhaust in) will be the second device in the system. The doser is bolted onto the decomp tube with three bolts. It should have two coolant lines running to it and one? def line. It has been a while since I looked at one of them. You will need two new gaskets if you take the tube off. The tube should be clean of all non metallic items, if you see a big ball or formation of crystallized salt looking material clean it out with water. It's not salt, don't lick it. If you take the doser off you will need two new gaskets for it as well.



The doser is in the center and is bolted onto the decomp tube.

If you have a cross over system it will be located on the driver side just above the driveshaft under the sleeper. The SCR will be on the drivers side and the dpf assembly will be on the passenger side. The doser located on the decomp tube will be located at a slightly offset angle from straight up with a likelihood of it leaning towards the drivers side.

 

well ok wouldnt it just be better to replace it if it has 450,000 and more than likely not been replaced i havent owned it the whole time and maintenance records dont show it being replaced and the scr being replaced wouldnt that checked when they sent dpf into get burned

 

If I remember right, they're about $170.00, which isn't too bad if it's really plugged up. It may not be your problem though, so get a gasket and check it out. If you have 5 of them, a gasket, a valve and the harness end wouldn't be a bad idea to have on hand.

It's a long story, but I found out that ZEP Battery Care cleaner does an excellent job of dissolving dried DEF without hurting the valve. Anyone who has cleaned one knows that you have to be really careful not to damage it and the dried DEF can be like concrete. They say to use a brass wire brush, but that hardly touches it. The ZEP turns it to mush, then you can use the wire brush a blow it clean easily.

I'm at an actual computer now, so I'm reading through the steps. There is not a whole lot you can do without Insite. Check the DEF Doser, DEF quality and DEF filter is about what you can do. They want to very the ECM calibration and SCR part #. Run some diagnostic tests on the DEF system and NOx sensor.

 

They should have known if the scr needed to be replaced when they cleaned the dpf and if it would have been covered if yo took it to a Cummins Dist.

 

yes sportster it was a peterbilt dealer so i presume they would have known but not to sure whether they actually checked it and advised correctly not having luck with any dealer all they do is tie up my truck for 2 or 3 days and a #### ton of money later and say it should be good now.

yeah gonna stock up on them and thanks for the info im just lost cause all i get is chasing my tail spent alot of money at dealers and still have issues

 

yes went to a peterbilt dealer id hope they would have said if needed to be replaced

 

IF the problem had been present when that was done. If it was, say, one inactive count 50 ECM hours ago that they saw on Insite, it's not going to set off a panic.
The other thing is, in order to figure out what the cause is, you also want to see what inactive codes go along with it. If you look up fault codes on Insite and you're seeing multiple counts related to the #2 NoX sensor, and they're recent, you would probably want to consider replacing the NoX sensor before you just threw on a new SCR.