Citroen Jumper 2.0 2016 check adblue system

[acatrajcic]

Thanks, guys!
I will try the 5 minute without the key tip, defenetly. I already tried with erasing the error and resetting the system, but the problem keep showing up every 5000 km. So If you find out what couses this problem, please let me know... Sorry, I don't know for sure ADblue consumption, is about 15000km with one tank.

[GiveMeABreak]

Your capacity of Adblue is 15 litres and at an average of 620 miles (1000km) per 1.5l of adblue that would be at anything from 10,000km up - depending on your driving style of course.

[stergioszx]

Dear Marc,
can you tell me if my Van has one or two nox sensors?
I'm trying to figure out what is happening by reading in forums and watching youtube videos.
Here in Greece we don't have mechanics that can diagnose and solve problems related to "new" technologies such as adblue.
Gathering information online is the only way to "guide" local technicians in order to find a solution!

Currently I get P20EE error but the "check adblue system" comes and goes (in the past it needed only obd reader to clean the check adblue system sign).

[GiveMeABreak]

Hi Stergios

I wouldn't start doing anything with the NOx sensors yet - you fault code is related to an Emission Control System Failure.

This specific fault code requires a suitable diagnostic tool (like Diagbox) with the latest updates. When this fault code comes up there is guidance to be followed provided by the diagnostic tool to resolve this. According to my information there is no physical repair to be done - just that the guidance has to be followed. What that guidance is I can't tell you as this will only be apparent when you use it - but I suggest you take it to your Citroen or Peugeot dealer and tell them you have this fault code and they should be able to reset it for you. This is not something a generic OBD code reader can do.

If and when you get it reset, don't ever let the Adblue get too low. These systems are designed to prevent restarting of the engine if the warnings are ignored and the Adblue is not topped up within the remaining permitted mileage - which should give you plenty of warning. If you have topped it up in time then it may be an issue with the resetting / quantities of Adblue added etc.

[stergioszx]

Dear Marc thanks again for your precious information.
I don't let the adblue level fall too much, in fact I top it up frequently (maybe this was the problem?)
I would like to see a warning about the level of the adblue, but I just get the "check ablue system" which I guess is a sign of a problem and not a sign of adblue level information (is this right?)
The only reason I don't go to the official service is the pricing policies they have...
...but eventually this is where I will end to...I guess...
Thank you Marc, thank you FCF

[GiveMeABreak]

If the light is on after 30 miles of driving and of topping up, then certainly get to the dealer in case there is an issue and it prevents starting.

I suspect that the issue relates to the topping up. If you overfill the Adblue it can confuse the ECU. That's why for larger top ups, they have a filler hose that goes into the tank - it should not be filled to the brim or the ECU can't calculate the amount that has gone in (I don't think these have a measuring float in the tank) and it relies on other means to determine the level. If it has been over-filled, then the system may get confused. So never fill it to the top of the filler neck.

[stergioszx]

update: the "check adblue system" and or the "checek engine" messages come and go.
Without me deleting anything with an obd reader they just go...
The car drives perfectly, actually it is one of the fastest cars I've ever owned!! hahahah.
Could those signs be the scr messages that come and go according to the manual????

[GiveMeABreak]

The SCR messages should come on and go off according to the manual and describe the specific conditions for doing so. So if they are not behaving as intended, then I would get it checked out.

[perfidus]

Hi all, I have a related question and don't want to open a new topic - regarding AdBlue level registered by the tank, is there a minimum of 6,10 litres that is shown on the Diagbox tool ? Like the 4.00 bar of pressure showing even the pump module is Off?

[perfidus]

Hi, seems difficult to find more informations about diagnosing these tanks, beside one topic on this forum and little info that I found on some polish forums. Everybody wants to get rid of this system because of poor designs. I asked this question on that topic but I will continue here with my findings.

On the DiagBox both heater tests are failing (pipe heating and tank heating) and I hear no pump noise with ignition ON. My feeling is that I have a defective tank rather than a bad pressure sensor, but I haven't take the tank down to measure the heating elements and the NTC (the procedures are on the Elektroda forum). Does anybody has these problems with the heaters - or these tests are both failing from other causes?
The status of the Denox system is "Urea gauge-pump module stopped empty" - but for sure there are more than 6 litres of liquid in the tank (only water - for cleaning/testing).

[perfidus]

Not many progress in searching what keeps the SCR urea tank from working. I just fixed the DPF part of the van engine, hope it lasts (wrote some details for whom it is interested in another topic). Now I'll have to find another slice of free time to take down the urea reservoir and make some measurements.

Regarding my last post above, I just read on Elektroda forum that the "status of the Denox system" does not take into account the level of urea in the reservoir but it has the following meaning: it is "empty" if the tank was not pressurized when the ignition/power was turned off, and it changes to "full" if the tank was at operating pressure when the ignition/power was turned off.

[perfidus]

A few notes for those of you with P20E8 errors and Lexia tools. Trying to test the heaters will fail if you do not use a battery maintainer because (I think) Lexia tool reads also the battery voltage and stop the test, the heaters are large loads which will stress the battery.
After a few tests and readings with Diagbox, I'm assuming that I'm lucky and still have a good urea tank (correct readings for urea level and temperature inside tank) but the problem was (or still is but maybe is intermittent) the crystallization in the urea pump or in the filter. After resetting the error, filling the tank with hot water, draining and adding 5 liters of fresh Adblue, now after more than 400Km I have no sign of error. I checked also for non permanent errors, none, and I can see 5 bar of pressure and the usual correct level (4,5 liters - 5000Km or 4,375 liters - 3100km remaining distance on different measurements), I can also see the message saying the status of "Urea Pump Switched Off, With Urea". I'm going to add a concentrated solution for keeping crystallization low when the weather starts to warm up.
I have one purchased together with the Adblue, it's from Liqui Molly part #21838, 19 euros/ 250ml (for 100 liters, 1:400). I'll come back with the results after 3K km or more...

[perfidus]

These days I was planning to add the anti-crystallisation solution into the adblue tank, but just before doing that the engine management light came suddenly on with the message Engine repair - Check Adblue System on the dashboard. The van was sitting in a parking with engine idling, after more than 50km on the road when this happened, so I suspected right away that is something else with the system, not pressure related. After conencting my bluetooth OBD diagnostic interface with E-OBD Facile app, the error code reading was P20EE-92 - SCR NOX Catalyst Efficiency Below Threshold (Bank 1). The pressure in the system was reading correct, above 5 bar (i remember something like almost 6 bar). The error does not dissapear after a few ingnition cycling, so I went home and connect my Lexia tool and reset the error with Diagbox. This weekend was Easter holyday in my country and I didn't have the time to go under the car to check the injector for leaks, but this is going to be the first check I'll made before anything.
Next step, pouring the Liqui Molly solution in the Adblue tank and drive 1000 km or until the Adblue light shows it needs refilling. Then flush all again with hot water and refill + another dose of Liqui Molly solution.
From the last topping with adblue (around 5 liters) the van was consuming not much of it, now it reads a constant 4,375 L (3050 km remaining distance before urea tank filling, on more than three measurements).
It's indeed frustrating, but a few drivers posted on the internet that this error dissapeared after they flushed old Adblue and change it with a better quality one.
Cheers!

[perfidus]

After another 200km or so, P20EE-92 reappeared this time along with P2BAD-92, both meaning about the same, NOx catalist efficiency low (Depolution of the deNOx sistem - emission control ineffective and, respective, Failure of the system). The second code was issued about 50km after the first. Checked under the car and there is no sign of Adblue leak.
But i found another similar situation on this forum:
viewtopic.php?p=822978#p822978
Udrea is loading into the SCR because there is pressure and it is consumed normally (at the end of this trip and the previous , about 400km, the Adblue level has dropped another 0,5 liters).
So, like the above topic posts concludes, it might be a failure of NOx sensor, a bad Adblue tank, bad Adblue injector or even the catalytic converter. NOx sensor is new. I will try to initialise the sensor again, maybe the procedure was not carried properly.

Edit:
Today I took my Lexia interface and with Diagbox 9.68 free I start the procedure for learning a NOx sensor (It is not changed again, but it has under 1000Km). First, you have to warm the engine above 80 degrees. Then you have to have patience for about 25 minutes. The procedure completes but it's giving me a message that indicates some errors at injection.

A new injector probably is also needed, this one has many years. When I replaced the DPF and restore AdBlue operation it was checked and cleaned well but who knows, maybe still have signs of wear.
I think it is not the SCR catalytic converter to blame. The final message of the test gives me some hope.