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+--- Thread: CM2350 ISB6.7 B101 EPA13 (/showthread.php?tid=9907)
CM2350 ISB6.7 B101 EPA13 - Madd Scientist - 01-17-2025
Hello everyone, thanks for allowing me to join the community. I have a 2014 freightliner Business Class M2-106 thats making me insane. I was hoping for a bit of guidance. I have 2 active codes 3714 & the notorious 3712. Both stay active all the time, its in a 5 mph torque derate & there are no other active dtc’s. Ive used Cummins Inline & Guidance app to update the software to the latest update DT90413.10 from the previous DT90413.08. The truck ran fine for 3 months and now its got the same 2 dtc’s active. No other dtc’s at all. After combing over the data i noticed a few things this time. We replaced the Outlet Nox Sensor because it was reading 1402ppm and the inlet was reading 180-250ppm. The DEF DOSER VALVE STATUS READS “dosing” even when its clearly not. I with the current derate i cant even get it to run the AFT DIAG TESTS OR DOSER VALVE TEST. Also the SCR INLET & OUTLET TEMP SENSOR VOLTAGE remains at zero even though its reading 900F-1200F within 10 minutes of cold startup. Cummins says to run the software update again but it keeps kicking it out and saying it already has the latest software. I know im not the only one whos had this issue but before I drop $3K on a new ECM at my nit so local Freightliner dealer i wanted to see what advice you guys might give. Thanks in advance.
Within the last 3 years its gotten a new aDEF HEAD SENSOR & tank, a new DEF pump assembly, new doser & Decomposition tube cleaned with all new seals & clamps. Outlet nox sendor, EGR & intake cleaned, EGR PRESSURE SENSOR (was cracked) & egr differential pressure sensor & passages cleaned.
RE: CM2350 ISB6.7 B101 EPA13 - Rawze - 01-17-2025
3714 = telling you that the engine is in derate, but not what for.
3712 = telling you that it is a derate related to continuous other SCR faults that have been active for too long.
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I.E.> not enough information on their own... What are the other faults that are coming up and causing this?. What are the inactive and or other codes... etc?.
and what is the engine ser#?>
what does the rgen history look like?.
and ... NO .. the ecm itself is not going bad just because you are getting those faults.
RE: CM2350 ISB6.7 B101 EPA13 - TomHanson - 01-17-2025
Is there an aftertreatment control module seperate from the ecm on a 14? If so, I wonder if something is funky going on there.
RE: CM2350 ISB6.7 B101 EPA13 - DVT873 - 01-17-2025
There was a separate DEF controller used on the 2010 - 2012 engines. The ESN would help. Problem is "year" sometimes doesn't tell a lot. There is calender year, model year and emissions year. They often don't line up. Plus supposedly there was some murky things with what "year" the engine was built. I recall being told that the day the crank went in the block was the build date for emissions. Coming up on the end of a calendar year going into a year where standards were changing some engine builders would overbuild what were basically short blocks and then finish them out after Jan. 1.
On the medium side I've seen MY 2011 trucks built as late as March of 2010 with EPA 07 engines. And schoolbuses are goofier yet. FWIW since the late 90's MY is a full year ahead of build year. Look at the year on the title (model year) vs the build date.
Fleets and rental groups benefit from this somewhat because the truck is often almost a year older than what the title says.
Again the ESN is the best source of info.