Technical Ducato P0401 P0402 P0236 P0238 and limp mode its 2017 Euro 6, EGR changed, What do I check next

[theoneandonly]

if it's possible to remove joint at DPF and get enough clearance to fit a cap on pipe and work out exact quantitie of DPF cleaner to fill up cooler( hose fitting and pump in liquid )to just below EGR valve, leave overnight, drain down,flush with clean water , and when dry refit pipe to DPF , I'm wondering could it work?

I thought about that in past but personally have had no need. If someone were to try it i would suggest useing the Launch product as used by the Irish Luton DPF expert on utube. how effective it would be getting to the sieve dont know. Might be a worthwile trial with a blocked cooler off the van.

 

[Grayducato]

Hi Fredastaire,

Sorry for my poor English, and thank you for your quick reply.
I got the software update on Oct 14 and other checks.
- Checking the injectors
- Checking the HP EGR
- Check the LP EGR
- Check the exhaust line and DPF
But without positive effect.

On Nov 25 I changed the BOSCH 0-281-006-287 (SENSOR EXHAUST PRESSURE).
Since Nov 12 I've had no mil light and no limp mode, until this weekend.... engine light and code P0236, P0238 and P0401.
Noticed, below 4°C outside temperature ( frost mode) there is no error, only from 5°C the error and mil light comes.
I tested this today, it's strange but it's real.
Next week I will contact Fiat Germany, let's see what they say.

I hope we will solve the problem soon.

Greetings Thomas.

Hi Thomas, Reading your post back in 2022 where you replaced Bosch sensor 0-281-006-287. Just recently (May 2024) an OBD error P224B showed up. My scanner said "pressure too high bank 1" lost stop-start and went into limp mode. Was this the error code you received, if not what made you decide to replace it? Did you get limp mode? Thanks.

 

[richarddgjames]

Read this thread as I like a good detective story! I have a 2017 manual 150 Maxi dual egr PVC (UKbased) and not yet had any of these problems but acquired an interest in fault codes when my van EML came on in Switzerland. A truck garage checked the fault (blowby problem; ironic given the 35degree C temperature at the time). But the mechanic updated the software to v32 saying it might sort it. It didn’t but it has seemed to go significantly better since, with the engine feeling much happier going uphill before needing a gear change despite prompting from the dash screen. I have used alfaobd demo with an old Samsung Galaxy tablet which gives me peace of mind when travelling abroad.
So apart from sharing my experience of v32, I wondered if, in terms of burning fuel more efficiently, should I go by the van’s gear change prompts or change when the van feels it needs it? (gears 4-5-6 being most relevant)

 

[richarddgjames]

And does anyone have any notion of what percentage of these vans are having this problem?

 

[CheeseMonster]

So apart from sharing my experience of v32, I wondered if, in terms of burning fuel more efficiently, should I go by the van’s gear change prompts or change when the van feels it needs it? (gears 4-5-6 being most relevant)

I have wondered too. In manual mode the dash "gear change indicator" has me changing up sooner in 4-5-6 than Auto or Auto with UP selected.
Does a higher gear cause less passage of exhaust gases through the EGR cooler/system?

 

[Serrow225]

I suspect we will never know for sure , fiat are going to keep it secret if it's another diesel gate.did they do v32 to retro tune engine to a higher nox level by trimming the low EGR system to not operate so much as it did when passing emissions tests and stop so much potential soot entering cooler ? Sort of a factory EGR delete!

 

[theoneandonly]

I suspect we will never know for sure , fiat are going to keep it secret fiat are going to keep it secret if it's another diesel gate.did they do v32 to retro tune engine to a higher nox level by trimming the low EGR system to not operate so much as it did when passing emissions tests and stop so much potential soot entering cooler ? Sort of a factory EGR delete!

One thing is for sure fiat are going to keep it secret whatever the changes and reasons. My suspicions lead me to the thinking problems are related to excess temperatures during regeneration causing cracking of the DPF. Batch related manufacturing issues of the dpf is probably also an issue. What causes the overtemperature? Overfuelling during regen. But why the number of software changes, insufficient test milage before Euro 6 implementation? Having read a few papers on twin egr design I very much doubt that your thoughts have any basis in reality, the power map/distribution for an auto and regen control is the main reason. But why should my guesses be any better than yours

 

[proppb]

Hi we are thinking of going looking at a van on Thursday and I have asked them to wipe the exhaust pipe.
This is the result, there is evidence of soot, if there is any soot in the tailpipe does that mean the dpf is potentially compromised?

 

[Serrow225]

Hi we are thinking of going looking at a van on Thursday and I have asked them to wipe the exhaust pipe.
This is the result, there is evidence of soot, if there is any soot in the tailpipe does that mean the dpf is potentially compromised?

Hi
I'm currently touring in my van now and wipe exhaust pipe at the end of every day, and depending on driving conditions have similar soot levels, I've spent around £3k on sorting out LP EGR not including DPF which I know is cracked but living with it ..

 

[proppb]

Hi
I'm currently touring in my van now and wipe exhaust pipe at the end of every day, and depending on driving conditions have similar soot levels, I've spent around £3k on sorting out LP EGR not including DPF which I know is cracked but living with it ..

So just to confirm you think the image i posted looks like your exhaust wipe, and you have a working lpegr but a ctracked dpf?
If the dpf is NOT cracked should there be any soot at all?
The van is we are looking at is 2018 and has 100K miles, dont know the software version yet as we are doing things remotely, will check with my mulitecuscan when we see it.
I guess to keep yourself on the road you are you taking the @fredastair approach, additive in the fuel and monitoring with multiecuscan?

 

[Serrow225]

So just to confirm you think the image i posted looks like your exhaust wipe, and you have a working lpegr but a cracked dpf?
If the dpf is NOT cracked should there be any soot at all?
I guess to keep yourself on the road you are you taking the @Fredastaire approach, additive in the fuel and monitoring with multiecuscan?

Hi , yes I'm running as suggested super diesel, additive and monitor with multiecuscan, I drive a transit van for work and although it's add blue,their is absolutely no black soot in exhaust, 90,000 miles it's spotless,DPF is working as should..

 

[Fredastaire]

Hi everybody, I'm still here, still surviving, still sticking with my fuelling regime. Because of house problems havnt used our van much for a few weeks but that's likely to get back to normal shortly. I'll keep following your comments.

 

[proppb]

Hi
I'm currently touring in my van now and wipe exhaust pipe at the end of every day, and depending on driving conditions have similar soot levels, I've spent around £3k on sorting out LP EGR not including DPF which I know is cracked but living with it ..

So just to confirm you think the image i posted looks like your exhaust wipe, and you have a working lpegr but a ctracked dpf?
If the dpf is NOT cracked should there be any soot at all?
I guess to keep yourself on the road you are you taking the @fredastair approach, additive in the fuel and monitoring with multiecuscan?

Hi , yes I'm running as suggested super diesel, additive and monitor with multiecuscan, I drive a transit van for work and although it's add blue,their is absolutely no black soot in exhaust, 90,000 miles it's spotless,DPF is working as should..

Thats Interesting, we are looking at this dual egr van because of the problems we have heard about with adblue vans and have steered away from the Transit because of the wet belt.
Your experience with the transit sort of goes against everything we have heard.

 

[Serrow225]

So just to confirm you think the image i posted looks like your exhaust wipe, and you have a working lpegr but a ctracked dpf?
If the dpf is NOT cracked should there be any soot at all?
I guess to keep yourself on the road you are you taking the @fredastair approach, additive in the fuel and monitoring with multiecuscan?

Thats Interesting, we are looking at this dual egr van because of the problems we have heard about with adblue vans and have steered away from the Transit because of the wet belt.
Your experience with the transit sort of goes against everything we have heard.

Hi , I'm lucky, my van is the only survivor from fleet purchased in 2018/19 , 3 vans snapped wet belt , 2 vans gearbox failure, a few EGR problems and add blue failures ... I'm the only driver of my transit and Its always driven with care so I don't know if that is why??

 

[theoneandonly]

If the dpf is NOT cracked should there be any soot at all?

No soot at all is what you are looking for. Clean as a clean thing.
But if the cooler and dpf have been replaced there may well be residual soot in the exhaust pipe.
If a cooler has been replaced but not dpf and exhaust cleaned you will end up with a running engine but some soot getting to the exhaust. Hope thats not too confusing

 

[proppb]

Hi just been looking at a 2.3 2019 van on line and made some enquiries with the seller and it turned out it had Adblue.
I was under the impression that all 2,3 vans between 2016 and 2019 were dual egr and then Fiat went to the 2.0 wet belt van?

 

[Fredastaire]

Sometime in the late quarter of 2019 Fiat changed the model to the Adblue variant.
.
Adblue brings a scary scenario particularly for low usage vans.

 

[theoneandonly]

The twin egr 2.3 ended sept 2019 then came a 2.3 adblu version then a (2022) 2.2 adblu multijet3 (developed from a 2016 jeep) not the peugeot 2.2 .

 

[Fredastaire]

I've been asked for a photo of an exhaust wipe, I've taken this today, it's been months ago that I wiped it last time so I'll do another when we get home.
.
The £1 coin is for scale.
.
For any newbie; I started this entire 50 page thread, I had my cooler changed circa 2 years back. The soot indicates a cracked DPF as in reality it should be spotless clean.

 

[Serrow225]

I've been asked for a photo of an exhaust wipe, I've taken this today, it's been months ago that I wiped it last time so I'll do another when we get home.
.
The £1 coin is for scale.
.
For any newbie; I started this entire 50 page thread, I had my cooler changed circa 2 years back. The soot indicates a cracked DPF as in reality it should be spotless clean.

Thanks for photo , interesting as I'm wiping exhaust pipe each time so I'm not getting a long term build up , but as you are still surviving with no issues, I'm more confident that I'm not going to have any more immediate problems either. I did notice that as the premium diesel with a treatment additive worked through combustion cycle my soot level has reduced slightly.