16 Promaster 3.0 SCR code P022EE

Javier Owner/Technician Richmond, California Posted   Latest  
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Emissions
2016 Ram ProMaster 3500 3.0L (D EXG) 6-spd (62TE)
P20EE — SCR NOx Catalyst Efficiency Below Threshold Bank 1

Hello, I have this promaster that keeps setting a P20EE- SCR below threshold. The DEF pump and injector have been replaced. The vehicle does NOT go into limp mode when the check engine comes on. It drives fine and seems to be doing its regens. When I do a manual regen, it successfully completes it. I have the WITECH 2.0 J2534. I cant seem to find the pids for the NOx sensors to monitor and check for a faulty sensor. I dont want to jump the gun and get a new SCR if one of my NOx sensors is faulty. Any tips on how to tackle this?

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Jim Owner
Philadelphia, Pennsylvania
Jim Default
 

I suggest you check for TSB for flash update.

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Matthew Mobile Technician
Bartlett, Illinois
Matthew Default
   

I do a lot of aftertreatment diag and have found overall SCR failures are not very common. Not sure if the ProMaster is different, but I would say less than 5% of the SCR efficiency codes and DEF quality codes I see are a bad SCR. The biggest cause of these codes are usually doser issues, exhaust leaks and bad NOx sensors. Unfortunately the OEM testing procedure suck, and Chrysler is by far the…

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Javier Owner/Technician
Richmond, California
Javier Default
 

Thank you very much for the tips. I will definitely take a look at the throttle and clean if necessary. For the NOx sensors, ive been trying to monitor them. I cant seem to find the PIDS for the NOx sensors on the WITECH 2.0 J2534 or on my SnapOn. Will the PIDS be named something other than NOx and that's why im not finding them?

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Matthew Mobile Technician
Bartlett, Illinois
Matthew Default
 

I don't think you have a throttle issue, that was just part of my tangent related to service info lol. I am not sure, they are usually NOx, but my FCA experience is mostly Cummins in truck and Sprinters.

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Zach Technician
St. Cloud, Minnesota
Zach Default
 

You need to be able to see pre and post NOX readings to determine SCR efficiency. I know the PIDS are available to view on both our Snap On Apollo and Solus, along with our Autologic scan tools. It usually takes around a 25 minute test drive for the NOX sensor to start responding. Load dependent you're usually looking for a 100 PPM difference between the two. Can you try generic OBD data on…

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Javier Owner/Technician
Richmond, California
Javier Default
 

Yea that's my problem, I cant see pe and post NOx readings. I see temperatures but no NOx readings. I checked with my Snap On Verus and WITECH, I cannot hook up with my Autologic since this is a Ram and not Mercedes. Ive also checked in generic OBD and find nothing. Do you know if they are named differently? I might be overlooking them because of the name.

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Chris Diagnostician
Bryans Road, Maryland
Chris Default
 

Have you tried snap on tech support? I know sometime they can tell you what it would be called or if it is capable. Seems like it would be worth a shot. Chris

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Javier Owner/Technician
Richmond, California
Javier Default
 

Yup tried, I called Snap On and they said they dont show PIDS for the NOx sensors.

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Zach Technician
St. Cloud, Minnesota
Zach Default
 

I know this sounds stupid but did you try to manually ID with your Autologic? I work on a lot of Freightliner Sprinters and I can usually pull data from the CDI if I identify the vehicle as a 906 Mercedes Sprinter. Also I haven't seen the NOX sensors called anything else besides NOX. This might all pan down to the fact that it's a RAM chassis.

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Javier Owner/Technician
Richmond, California
Javier Update
 

So I noticed that a PID called Lambda Probe temperature is always above 1000*F. I believe this is my oxygen sensor. Cold KOEO is at 1020*F, once its fully warm it stays around 1500*F. Can this oxygen sensor cause issues with the SCR system?

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Mihail Mechanic
Rockville, Maryland
Mihail Default
 

Hi, you need to find what this temperature sensor is and replace it. This definitely can be your problem. You need to check all other temp. sensors for plausible readings when the engine is cold and then watch them how they read as engine warms up. Make sure you are looking in the right module for the NOX sensor readings. On Mercedes vehicles they are not in the SCR module but in the ECM. Good…

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Joel Owner/Technician
Carthage, New York
Joel Default
 

I work on a lot diesel pickups, medium and heavy duty pickups I use my portable 5 gas analyzer on trucks that I want to check the outlet nox sensor to make sure it‘s reading correctly. I’ve had one medium duty cummins that for some reason didn’t have the pids for inlet and outlet nox sensor readings and I have Cummins insite. I check my scr pressure and quantity then take it for a test drive and…

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Anthony Technical Support Specialist
Kirkwood, Pennsylvania
Anthony Default
 

Hi Javier: I've never hooked up to one of these. What I find interesting is that a whole lot of people who responded seem to think this is a Daimler engine. It is an Iveco (Fiat). If you have a Euro tool, you may wish to see if it will connect using a Ducato as the vehicle selection. Perhaps you'll find the PIDs that you are looking for. Guido

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Javier Owner/Technician
Richmond, California
Javier Update
 

So I replaced the oxy sensor. Performed the resets for oxy sensor and still had the temp over 1000*F with KOEO engine cold. The highest the temp goes is 1500*F when driving. Drove the vehicle and the P022EE code returned. I still cannot monitor the NOx sensors and now im wondering if that oxy temp is a PCM issue.

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Mihail Mechanic
Rockville, Maryland
Mihail Default
 

Carefully inspect the wiring harness to the sensor for damage - may be it is touching the exhaust somewhere. Next thing would be to find where the sensor wires connect to the pcm, disconnect that connector and load the wires to check for open. Good luck.

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Javier Owner/Technician
Richmond, California
Javier Update
 

Pulled the trigger on the SCR and now it ran the monitors and passed smog. I wish the scan tools would show the NOx sensor readings to quickly diagnose the SCR performance. Without those NOx values, it feels like a guessing game. Thanks everyone for the help.

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