2012 RAM 5500 150 Miles to shutdown

Eric Manager Arizona Posted   Latest  
Resolved
Emissions
2012 Ram 5500 ST 6.7L (L ETJ) 6-spd (AS68RC) — 3C7WDMBLXCG224523
P207F — Reductant Quality Performance
P20EE — SCR NOx Catalyst Efficiency Below Threshold Bank 1
Check Engine Light

Well this one has me confused. Looked at codes and run the tests. DEF condition good. Injector flow rate good. Current ECM version level. Even replaced SRC NOx catalyst because flow chart said that was next thing to do. Clear codes and after driving for some time(50-100 miles) the codes will come back. In looking through data stream can not locate NOx sensor pids. Have tried 3 different scanners, but do not have Witech. Have no codes for them but wondering if they can become slow like O2 sensors but not set a code. Anybody know if the data is available or we have to trust the computer know what it is doing. Tired of following flowchart and not getting results.

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Richard Mechanic
Illinois
Richard
 

Have you pulled out DEF injector and inspected for buildup on injector tip

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Eric Manager
Arizona
Eric
 

Very little build up and spray pattern good.

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Michael Mobile Technician
Utah
Michael
 

I think there is a major emissions campaign on these. I have programmed a few of them at independent shops where they remove one NOx sensor and some other parts are exchanged.

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Michael Owner/Technician
Florida
Michael
 

The application your referring to is the … Ram's that came equipped with an NH3 sensor in the middle of the SCR catalyst. There was an update from Chrysler that had you replace the SCR catalyst with a unit that did not have a provision for the NH3 sensor. Furthermore, the PCM required an update to remove this sensor/module from the software. The original reason/thought process behind the…

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Randall Owner/Technician
Michigan
Randall
 

Probably no help at all, but I don't recall seeing a procedure for “over flashing” current calibration. Similar vehicle, one of the codes you are getting called out in the bulletin. static​.​nhtsa​.​gov/odi/tsbs/2014…​.​pdf Seems as I recall some manufacturers don't support “over flashing”. May not be helpful for your situation, as the code clearing…

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Michael Owner/Technician
Florida
Michael
 

Unfortunately, those early generation Ram trucks with SCR do not have NOx sensor data available… HUGE miss by Dodge/Chrysler! Nevertheless, when we see these generation of trucks with these issues, we follow the same procedure as you… check DEF injector flow/volume, check the DEF itself, check for intake/exhaust leaks… if all that looks good, replace both NOx sensors. Unless it is a very high…

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Rex Technical Support Specialist
Ohio
Rex
 

Michael, looking for some background on the FCA Cummins relationship. I see all MD and HD so INSITE is what I use. My understanding is that when Dodge first used Cummins INSITE was the tool, then eventually FCA hung their own programming on. When did that happen? Given the year is FCA just “partially interpreting” the Cummins data stream? Could he connect thru the 3 pin Deutsch connector with…

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Michael Owner/Technician
Florida
Michael
 

Rex, I am not aware that INSITE was ever used for Dodge applications. Circa 1998.5 when the Cummins 24V (VP44) 5.9L engines showed up in Dodge applications, the factory tool was the DRBIII. That's what we always used for diagnosis. Following the introduction of CAN bus systems on Ram applications (06-07) the scan tool switched the Star Mobile and then of course now Witech2 via the MicroPod2…

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Randall Owner/Technician
Michigan
Randall
 

MD and HD is not my wheel house, but came across the following (not useful for this post/application), It appears the clock is running out on the Cummins Dynamic Engine System Analysis (DESA) for MD and HD, which appears to be a free download with a free license, that will no longer be offered for new licenses after Feb. 2022. cummins​.​com/parts-and-serv… I suspect it needs some…

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Eric Manager
Arizona
Eric
 

Thanks for the info. Will replace the NOx sensor and let you guys know how it goes.

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Eric Manager
Arizona
Eric Resolution
 

Thanks guys for the info. Replaced NoX sensors with OE sensors and has not returned.

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