Full de-mandate on a 15 litre Cummins

[Rawze]

(04-28-2025 )Fleetman13 Wrote:  I’ve got a 2017 cm2350 15 liter Cummins I’m wanting to de-mandate in a peterbuilt wrecker. It went to Rush truck for a recall and they did some tuning on it and it has been a turd ever since. Used to be a stout truck and it only has 30k miles on it. It’s on its second DPF in the last 2 years. Cummins trouble tree literally says to replace particulate matter sensor and if that don’t fix it replace the DPF, this makes 2 DPF and 2 particulate sensors and I’m not keen on putting another DPF on the truck if they are gonna cost me almost 7k a pop. I’ve went in and adjusted the regen parameters (I have insite with fleet counts and such) to enable temp stabilization and to drop the regen speed to 1mph looking for a solution and only thing that comes to mind is de-mandating the truck I don’t want any power gains I wanna stock truck de-mandated. It has set a 2692 (Cummins fault code for DPF system data erratic. Ran the deposit clean and everything passes air handling test whole 9 yards in at a loss. I had a friend come across this issue years ago in a trash truck and Cummins made him fleet calibrate it to a fire truck ECM code. He says it never came back for years. I have the capability to do so just not crazy about putting a bandaid on a bullet hole so to speak. IMO anything that eats its own crap ain’t worth havin

It depend on if you want to actually fix your emissions issues or not. It sounds to me like you are barking up the wrong tree with it.. expecting an OEM stealers$it to try to solve DPF issues is like taking your truck to the local hair dresser in town... they are equally about as knowledgeable about the subject.


When is the last time someone did an actual EGR tune-up on it?... that stealers$it is not about to do any of that .. it makes them no moneys and they cant sell you the most expensive parts like DPF, etc. either.

EGR tune-up work has to be done every year -- YOURSELF!!!... otherwise, it is not getting done. - and then every 2 years, the cans removed - YOURSELF, and taken to (unfortunately the stealers$it) to be de-ashed, baked, and flow tested for a few hundred bucks. LEARN TO WORK ON IT AND KEEP AFTER ITS PREVENTATIVE MAINTENANCE YOURSELF AND MOST OF THOSE ISSUES WILL GO AWAY!.

IT IS THE ENGINE and its EGR system getting clogged up that causes damn near ALL of the aftertreatment issues. Those cans under there collect the soot.. not make it. Cleaning the engine EGR system and piping all out regurlarly + replacing all related sensors that are getting sooty once a year stops this.

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On the other hand, if you live in a country where that stuffs is legal ...ehemm /... .. if you want to de-mandate it 100% yourself, then simply copy the program from the ECM (not very difficult to do) and e-mail it to me for a review and to have anything done as desired to it. That or get with one of the officially recommended people at the bottom of this post ...
ref: https://rawze.com/forums/showthread.php?...2#pid81862
so that your not on here crying in a year form now with engine issues and a bad delete... and me telling you to copy the program to see what some idiot did in there that destroyed the engine or turbo.