2014 Jeep Grand Cherokee DEF system

Norman Owner/Technician Indiana Posted   Latest  
Unsolved
Emissions
2014 Jeep Grand Cherokee Limited 3.0L (M EXF) 8-spd (8HP70) — 1C4RJEBM3EC322493
P2002 — Particulate Filter Efficiency Below Threshold Bank 1
P20E8 — Reductant Pressure Too Low
Replaced Def Tank With Pump
Replaced Dosing Valve
Replaced Both Nox Sensors
Reflashed Multiple Times And Drove The 60 Minute Circuit Multiple Times

This one is truly killing me. It had quit setting the Particulate Filter Efficiency code but now it's back and accompanied by the low pressure code which had been gone after replacing the dosing valve. The pump is new, there are no external leaks. I drained the DEF fluid which was new from NAPA and put in the OEM stuff and followed the “healing” procedure to the T…now I am back to the beginning again. I would say the particulate filter needs changed but if the pressure is truly low then that should most likely be dealt with first…do these pumps have issues?

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Mitchell Service Manager
New York
Mitchell
   

If you're not getting pressure, then the spray won't be adequate, to satisfy the SCR cleaning what is the tank temperature? is it frozen still? try to prime the pump, with the line disconnected @ the injector

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Carey Technician
Indiana
Carey
 

Diesel Exhaust Fluid (DEF) is injected into the exhaust stream to turn NOx gases (harmful emissions) into nitrogen and water. I don't think it's for cleaning the SCR. Unless there's more to it than I know. Which isn't a whole lot.

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Marvin Mechanic
Mississippi
Marvin
 

Yes thats right..when it works right its a good thing,does not harm engine like egr does….different manufactures change the order in which it is put in exhaust but still always does same thing,,,,,,

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Glenn Owner/Technician
Texas
Glenn
 

Hi Norman, First thing to check is for any TSB's or updates to the programming. DEF systems are constantly evolving, I have seen many require updated programming has the system ages. I would look at the inlet and outlet temp probes. This sounds like a desired versus actual temp issue. It would also be good to disconnect the battery power and cross the cables for 30 minutes or so to deplete…

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Jon Owner/Technician
California
Jon
 

P20E8 will set if the computer can't get the system to prime, it will try up to 10 times, I think, before setting the fault. Since the pump and injector are new…. I would go back to the basis. Power and ground at the pump and at the injector. Obstructed def fluid line etc. It has to be staring us right in the face -

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Agree
John Owner/Technician
Colorado
John
 

When you perform DEF spray pattern and volume tests it passes? Aftermarket parts?

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Norman Owner/Technician
Indiana
Norman
 

No aftermarket parts…I have not performed spray pattern and volume tests…is this in the Miscellaneous functions on the WiTech? If so I missed it. Do you have instructions and specifications?

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Mitchell Service Manager
New York
Mitchell
 

He's not going to pass spray pattern test, with low pressure I own a … Eco Diesel, that the dpf flange bolts broke, melted the injector and pipe. the prime charge was leaking on the ground, by the time I realized it

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Marvin Mechanic
Mississippi
Marvin
 

is the code for particulate filter or Scr catalyst effeciency ..usually particulste filter codes don’t refer to def .on this system which one is first catalyst then particulate then def injector then Scr catallyst ?or is it arranged differently?was there any particulate filter High temp codes when came in .?

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Norman Owner/Technician
Indiana
Norman
 

Code P2002 Particulate Filter Efficiency Below Threshold followed by P241D SCR Inducement Forced Engine Shutdown (pending) followed by P20E8 Reductant Pressure too low. That is the order they come up in with WiTech. Never had a particulate filter High Temp code…have had a P1288 for NOx Sensor Zero Offset and a P2BA9 for Insufficient Reductant Quality.

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Jon Owner/Technician
California
Jon
 

I think that your first 2 codes are victim codes of the P20E8. If the system can not provide enough fluid (P20E8) it can't clean the filter efficiently (P2002) and the automatic chain of events with any DEF fault is a de-rate (P241D) My 2 cents anyway

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Marvin Mechanic
Mississippi
Marvin
 

Norman p2002 is saying that when doing a regen the presure in in particlate filter is lower than it should be…..it knows what is normal restriction,,,,if hte insides on particlate filter is broke or cracked real bad could set the code….said bad hoses going to the differential pressure sensor or a bad differentail pressure sensor could set it,,,look at the particulate filter diiff sensor with…

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Jon Owner/Technician
California
Jon
 

I could be wrong but I think model this doses ahead of the dpf?

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Marvin Mechanic
Mississippi
Marvin
 

Def goes in before scr cat…..def injector has nothing to do with regen,,,

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Jon Owner/Technician
California
Jon
 

Right - but this model injects ahead of both bricks I think-

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Marvin Mechanic
Mississippi
Marvin
 

Look up part number …ab and see if yours looks like this,,,,,the def injector goes into it right?? If so that is the scr catalyst

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Marvin Mechanic
Mississippi
Marvin
 

Did you get peoblem resolved,,,,,,did anyones advise help..havent seen anything posted on it

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