2017 Berlingo enterprise - Additive issues

[smart123+]

Good evening,
this is my first post, in desperation and need of help, can anyone assist me please,
I have a 2017 Berlingo HDI 1.6 owned since March 2022, purchased with 51k, fsh etc, van had been very good apart from the usual blown headlights which seem to go quite often, however last year the Urea light came on, i filled up with adblue and error went away, a few days later the warning triangle appeared and message popped up saying engine needs attention so i went to my local knowledable indy for advice, van was plugged in and showed the usual multiplex additive error codes, van had done 88k around this time so the PAT fluid tank was filled up as it was quite low, all fault codes reset and away i went, all was well until i filled up, upon leaving the fuel station the triangle and error message appeared, back to the garage, mulitplex additive error codes still, so replaced the addititve tank as this showed as faulty, upon fitting it was noted that the flexipipe was split, however left that for another day, drove off and no fault codes until i filled up and again the codes returned, this time i went to Citroen and was told that they had reset all codes and was also told the DPF was nearing the end of its life and needed to be replaced, went to fuel station on way home and ping light and error code back on, went back to Citroen and was told that even though the multiplex additive is showing as an error so is the DPF and until i replace that it will keep happening.
So sent DPF off for a clean, had it re fitted along with a new flexi hose and fuel filter, all was reset and was good until the second time i refuelled the triangle and error message has returned....... garage read error code this morning and now it says multiplex additive tank leak detected ? this is the first time we have seen this, so van booked in to now have a new DPF pressure pipe fitted, it does not look like it is leaking and tank still showing 90% full !! the adblue side of things has been checked, a spray test perfomed and all is well so i really dont think it is adblue but the damn Eolys / pat fluid tank issue, what are your thoughts on this matter guys, sorry for the long message but wanted to explain it all for you.....

[GiveMeABreak]

Ok, so the full explanation is better than missing half of the important stuff out

My thoughts are that it may not be the Eolys additive tank itself, but the electronic connections to the tank. Each time you fuel up, the system works out that you have added fuel and commands the additive pump to meter the additive into the fuel tank. From the sounds of it, it is not happening. We know of cases here where people assume it is always the additive tank, but don't realise that the data network wiring may be compromised. This is the wiring from the additive tank back, where it can become broken or corroded.

If this is the case you can replace the tanks as often as you like but it won't stop the warning if the data network is not communicating with the additive pump.

All the while the additive pump is not dosing the fuel, then your DPF is at risk of clogging because assisted regeneration won't work if there is no additive to reduce the temperature at which the particulate matter burns off. So maybe some investigation at the wiring back from the tank is needed.

[smart123+]

Hi Marc,

thank you very much for your reply,
Can i run this past you, from my understandings (which are limited) if it was the wiring then would it never reset? each time we reset we go throught the motions of priming the tank etc which is effective as you can hear it ticking and the hand held scanner has so far gone through all the motions or deleting the codes, we also did a force regen when the DPF was refitted just to ensure all was communicating, this time round it allowed me to fill up once with no issues and now upon second time of refuellling its thrown this new error code, today upon this error code we could not reset, can the wiring from the tank/pump back be replaced, would you happen to know what this wiring is called ?
many thanks again
Steve.

[GiveMeABreak]

It's just another thing to check out. Let me have your VIN so I can see if there is a separate harness. Please post your VIN in full without spaces - it will be automatically masked from public view after submitting your post & will only be visible to staff.

[smart123+]

Hi Marc,

many thanks for your help here.

it is VF7**************[VIN obfuscated, can be read by forum staff]

[GiveMeABreak]

Ok, so no it looks like that whole harness is part of the intermediate harness for the vehicle.

So I would have the additive supply pipe to the fuel tank checked to make sure it isn't leaking or blocked, and separately trace the wiring back as far as you can to see if you can see any damage from heat or corrosion.

I don't have an electrical diagram for this vehicle unfortunately.

[smart123+]

Hi Marc,

sorry i have just two more questions, when i fill up with fuel what is actully instructing the additive pump to inject the Eolys fluid? is it the fuel filler cap or the flap on the van or the sender device in the fuel tank? i seem to get a different answer each time.... and finally is the EOLYS fluid injected into the tank or literally just pumped from the tank?

thank you for looking, very much appreciated, ok i will do just that and will refer back to the forum later this week regarding the loom/wiring.. thanks Steve.

[GiveMeABreak]

Ok so

1) It is the engine ECU that calculates whether any fuel has been added to the tank from taking measurements when the engine is switched off and then later started again. Based on the quantity of fuel added (if any), it meters out the correct dosage and this is usually a very small amount.

2) On later vehicles they've mostly done away with the fuel cap open detection as this is surplus to requirement these days - it's all done with the fuel calculation by the engine ECU.

[smart123+]

thanks Marc, you have been a GREAT help..... i will be back later in the week with an update.

atb Steve.

[smart123+]

Good afternoon,
well collected the van from the garage today, as per my first thread after spending £1000's on this van i still have issues, the last fault code was a "leak detection" on the multiplex additive side of things, after a thorough investigation there is no leak.... a forced regen has been done and for the moment fault code did clear this time and no fault codes showing however during investigation the pressure is showing as 60 bar!! garage is now saying it could be a dodgy DPF sensor, were running out of ideas now, van has never gone into limp mode and is driving absolutely fine, returning 62mpg, no smoke, no loss of power etc, so now going down the route of trying a new DPF sensor..... failing that a new DPF but reluctant to do this as it does not seem like the DPF is the problem.....
The wiring has been checked Givemeabreak and all seems well, so fed up, any thoughts guys? thanks Steve.

[Tuctuc]

Hi Smart123+, sorry for resurecting an old post but did you ever resolve the eolys issue?
My 2017 enterprise van is doing similar, refill eolys OK for a few thousand mls, then triangle on again every fillip, new tank pump etc then OK gor 5k mls but now triangle is back again.
Cheers
Chris