C4 picasso bluehdi u029e 87 error code - has anyone had this? What was the solution please?

[GiveMeABreak]

So if the heating element isn't working - it may be the heating part integrated into the tank, or the harness / specific wiring that is supplying them.

[Mexico14]

Would that be linked to the Injection fault and excessive pressure fault?

[GiveMeABreak]

Well if the Urea Injector or the surrounding area is covered by crystallisation, then that will cause a pressure problem.

As for the other issue I'll move that to a separate thread:

viewtopic.php?t=75031

[Mexico14]

Did a flow test and the test was interrupted as heating requested by the denox system. Any ideas on why it would say that?

[GiveMeABreak]

If the denox system heating is not working then it won't be able to complete the test or is refusing to do the test - as running the fluid through unheated supply pipes may cause it to crystallise in the supply and if that happens it will get blocked up rapidly.

[rimgaudas]

If the denox system heating is not working then it won't be able to complete the test or is refusing to do the test - as running the fluid through unheated supply pipes may cause it to crystallise in the supply and if that happens it will get blocked up rapidly.

https://allegro.pl/oferta/dodatek-do-ad ... OTNmMWI%3D

[GiveMeABreak]

@rimgaudas: Yes that's ok to help prevent crystallisation from building up in the first place, but it may be too late at this stage if the injector or supply pipes are blocked - which can cause the back pressure. Hard to say without investigation, but I would certainly ensure that additives like this (or products from Forte / Wynn's) are used in future to help prevent crystallising of the Urea.

[Mexico14]

As urea was present in the sealed pump area, would this be responsible for the Injector failing the test or is that controlled by a different part?

[GiveMeABreak]

Everything is controlled by the engine ECU.

It will be difficult to pinpoint the issue looking in the tank, because that could be 'historic' crystallisation. Heaters in the tank and the supply pipe all the way top the injector keep the solution in a liquid form. But when temperatures drop Adblue can freeze (usually at -11°C), so in very cold winters, the vehicle should be left after starting for a few minutes to allow the heating elements to thaw the solution. Driving off without doing this can cause issues. The heaters only operate when the system is supplied. Although Urea can be thawed, it may leave some crystallisation which can accumulate - and especially where the tank has a low level of Urea.

I filled the Adblue tank and put in a bottle of Wynn's treatment to prevent crystallisation and to remove any light build of of crystals. But I don't believe it's a good idea to let the Adblue tank get low on fluid. This adds all the excess air into the tank, resulting in the inevitable rusting. So I shall wait for the next top up at about 6 months, then I'll add a bottle of the Wynn's into a new 10 Litre Adblue container and then use this to top the tank up every few months, which should work.

[Mexico14]

**UPDATE**

The dealers have diagnosed that a new tank is needed.
Is this an original part or is this a supersession?
Would an update that requires connection to PSA servers be needed for a new tank? Paul R has found a cheaper tank frkm Germany which may be an option if citroen aren't able to contribute towards the costs. The dealers reckon I may be able to get 30% contribution from citroen but only off their cost price of the tank.

[GiveMeABreak]

It is a superseded part number (the latest) and I can confirm the prices are as stated. They are quoting for a complete tank that contains the ECU and pump etc.

It does require programming if replaced.

[Mexico14]

Thanks Marc. Upto now I've exchanged emails and phone calls with citroen and the dealer. First they offered 30% off the part, then it went upto 40% taking the price to 798 with fitting and Vat.

The guy at the dealers told me the the pumps just don't die instantly and can turn on and off over a period of time before giving up the ghost.

Last year whilst still under an extended warranty a countdown come on and wouldn't dissappear. I booked the car in to be seen and they diagnosed it as needing an eolys refill. At the time I had the EML and the urea countdown, the exact same thing happened again earlier this year and Paul R kindly reset the countdown for me, it dissappeared until a few weeks ago.

My argument with them now is I believe this problem started whilst under warrenty and had the pump not been working during the time of their inspection I'd have had a pump replacement covered FOC by warranty! By sheer bad fortune the pump turned itself back on at the time of inspection by the dealer and it went undiagnosed.

Out of interest do you know what type of torx screws are on the pump assembly?

[GiveMeABreak]

Not to hand, sorry. Also, removing the bolts of the reservoir also damages some of the other clips that secure the tank, but they should not affect replacement of the reservoir.

[gentscha]

Hi,
i have a similar error code.. My old adblue tank got first the famous p20e8 problem, but still had connection to the car.. (Pressure 4bar, Temperatura normally shown).. after it i ordered a tank from TurboTec, which lasted 1 month and it got a U029e error code (no connection to the ..), i send it back and got a new TurboTec tank (refurbished), which worked 10km, and it got the same problem.
Now i checked my old tank, which at least connected to the car, and installed it back to the car. Now i dont even get a connection to this tank anymore - the temperature shows -40°C and the pressure 0,5bar (as with the others).
So i think, there is a problem with the electronics from the car..

Is there any fuse somewhere hidden? I checked every single fuse in the engine and passengers cabine and didnt find a faulty one. The cable to the tank shows 12V on the red and the middle ones something between 2-3V..;

Is there another fuse? Where does the cable from the tank go - where can i find the other end, to check the continuity?

Thanks for the help!

[gentscha]

Does anyone has an idea? Is there actually a possibility to test the tank-ECU itself?