Heads up information related to SCR/DEF on ISX15
I thought everyone might be interested in some information that I've found out about the ISX15 in the 2012 KWs, not sure if the following is true for other model trucks with this motor as I have only been talking to two people I know who have a 2012 KW T700.
Both friends have been having severe issues with their DEF/SCR system causing problems, including two or three derates each. They've spent the majority of this year so far in the shop.
My one friend finally got tired of the problem, drove it to his local dealer and told them "I'm not picking it back up until you can tell me why this keeps failing" and then called both corporate KW and Cummins to let them know what was wrong and get some help getting the problem fixed.
My other friend got in touch with a contact at the KW in Green Bay (should tell you who we're lease purchasing trucks from) and they have been working to resolve his issue.
Both kept getting DEF/SCR codes indicating the system needed cleaned.
One found out that the three heated supply lines to the system have an active recall on the parts, however his VIN has not been released in the recall campaigns (they've only released 2 of 3 sets of VINs) but he was assured his VIN will be in the last set of VINs.
The other found out his SCR Catalyst was bad and this is a known issue for this truck so much so the part has as many as 70 on back order. His small KW in Terre Haute told him they do about one replacement a month it's such a common issue. He was told however, this does not seem to be a recall issue, yet. He has been working with the regional service manager for his shop (I believe he covers IN, IL, WI, MI)
Both had work done on this system that was erroneously billed as non-warranty work so they are both having to try and get reimbursed for the funds they were charged.
I'm posting this to let anyone may be having similar, frequent, issues know which direction they may be able to point a shop in.
These systems should not fault out that often so if they keep doing it, there is an underlying issue. A few of the shops my buddy with the bad catalyst went to just followed their flow charts that told them to clean the system and sent him on his way. He broke down less than 48 hours later in one case of this happening (was the final straw). Also, if a component of this system fails during the power-train warranty, it should be covered by the warranty.
I'm not sure how they managed to figure it out, but my friend with the bad catalyst, the dealer was able to determine it was bad without any fault codes. This may be due to the fact that he get the regional service manager involved and he required they actually troubleshoot the issue not follow the flow charts they're required. I'm not sure and my friend didn't ask.
They've both lost a lot of revenue due to this system failing on them. Hopefully this info will help save other people some time and money if they're having the same problems or start to experience this system faulting/derating.
Is this a worthwhile discussion?