We have Fiat Ducato 2.3 DS 150cv e6 Roller team 707.2017

[Dora the Explorer]

Roughly 10mins after seting of when the temperature has reached normal it goes into limp mode you stop turn it of then
start up again and it runs fine for the rest of the journey weather short or long and same on return journey.
We have had a new egr valve fitted still the same no change !
Any thoughts please
Thanks Pete.

 

[Clivefog]

You need to get an OBD reading to see if there are any fault codes.

 

[Phill D]

Hi and welcome

I Doubt it's erg related.
It's sounds more likely to be the engine temp sensor related but as has been mentioned above it needs an obd scan when the fault happens.

 

[Dora the Explorer]

Hi and thanks for your replies this is the last read out we got.
I am not keen on spending over a £1000 on a new turbo and it's still the same.
Cheers Pete

 

[Phill D]

, how does the garage reconcile that diagnosis and going to limp mode when the engine temperature reaches normal. Then is OK for the rest of the journey?

So have I understood this correctly, did the garage say it was egr Vale and changed it, and now they say its the turbo.

If that is what they have said I would get a second opinion before parting with any more cash.

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[TheBig1]

It will be a sensor, not the turbo. Probably the exhaust gas temperature sensor

 

[Phill D]

It will be a sensor, not the turbo. Probably the exhaust gas temperature sensor

Undoubtedly a temperature related sensor me thinks.

 

[Dora the Explorer]

Morning Guys, yes garage said EGR valve now turbo !
Like the idea of exhaust gas temperature sensor
Will check that out.
Thanks Pete.

 

[Phill D]

If they insist it's the turbo, ask them to underwite it, that is if its not the turbo and the problem still exists they will refund the costs.
Unlikely, they will do that but they are supposed to be the experts with the diagnostic system's.
They cannot expect you to keep funding their guess work.

 

[Phill D]

Is this a Fiat garage that have diagnosed these faults?

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[tm7000hd]

Sadly I fear that you may have joined the ever-growing club of those having problems with the low pressure EGR circuit of these twin EGR engines. I suggest reading the thread below - the fault codes often lead to an erroneous replacement of the high pressure EGR as a first step and your current P0238 code points to the air flow calculation/mismatch errors highlighted in the thread, perhaps down to a blocked low pressure EGR cooler.

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

Van is 2017 Euro 6 bought new , now with 26K on clock. Problems started this summer with dash engine light and code P0401 appeared on a country lane at low speed going into a corner so it would be low airflow going in to the engine as it wasn’t ‘working’. Bought FCR and cleared fault, happened...

www.fiatforum.com

 

[Dora the Explorer]

Ref Pill's last post the first diagnostic was a local commercial van centre the second
was Northan commercial Tonbridge who said Turbo, but also suspected injector and
dpf failure!!!! But just to repeat gose too limp mode ten minutes after setting of
when temperature reaches normal turn it of on again drives perfectly for rest of
journey be it 20 miles or 200 miles.

Thanks for other post about twin egr engines
Pete.

 

[Phill D]

It sounds like they have no idea, and straw clutching.

To me it is unlikely to be a turbo or an injector if turning off and back on again clears the problem and it does not reoccur again during the following drive.
It is more likely a sensor that causes the limp mode and resets itself when turned off and on again.
If the turbo was developing a fault at a given temperature then it would be unlikely that fault would clear until the turbo was again below temperature which is not what you say is happening.

 

[Dora the Explorer]

Thanks for all your help Phill have been recomended to a local independent garage
That repairs a lot of Fiat vans. Will talk to them next week.
Cheers Pete.

 

[Phill D]

Hope you get it sorted and with a sensible repair and cost.

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[the1andonly]

I would be interested in how this was resolved but with 5 posts only i dont expect a reply.
So for those that come here via a search.

Ducato twin EGR Engine with P0401 Code (2016 to 2019)

This does not refer to earlier single EGR systems or to later AdBlu SCR engines. Note this is a guide and not definative. It is up to you to make decissions. It is the result of my investigations of data from many contributors and discussion with...

www.fiatforum.com

 

[Guigsy]

If guess that the turbo pressure isn't responding quite the way the ECU is expecting. As things warms up, it expects a parameter to change in a certain way, but it doesn't. So it goes into limp to protect against a potential problem. But when it's already warmed up and restarted, it expects a steady state, so it remains happy.

Would a small leak in the intake piping around the intercooler do this? Or it could just be a sensor issue like a temperature probe.

 

[the1andonly]

Guigsy i'd be very surprised if its not the classic twin egr lpegr cooler syndrome. The limp mode 10 mins into a journey is a classic symtem. The engine asks for more input the cooler sieve is blocked restricting flow the ecu demands unfeasable flow from the hpegr and throws a p0401. It is easy to diagnose but very few garages know about it. Classic fiat dissemination of information.
First check exhaust pipe clean or sooty. A good engine should be squeeky clean. Sooty indicates a cracked dpf. Next question freeze frame info when p0401 is thrown. There are clues there. Live data will then confirm it (multiecuscan a good product for this) the lpegr opening will vary between 0 and 4.7 and few values in between , a good engine shows control with much more variation in value and not just on and off. The lpegr cooler temperature is also an indicator. The cause, poor software control of regeneration and injection. Edit (having wrong MAP sensors fitted at factory didnt help some people) Should be resolved with software updates and clean injectors , it is not inevitable. Though if youve got it it will cost a damned sight more. I have diagnosed over 20 engines with this issue. All that is needed (for diagnosis) is a10-15min blast up motorway (with a warm engine) and the data collected with Mes. A case of the error codes leading you up a blind alleyway. Ps this can also tell you that you havent got a problem. Read the links above.

 

[125BEER]

Hope the free member becomes Funster.
Great info from above Funsters.

Cheers

 

[Guigsy]

Guigsy i'd be very surprised if its not the classic twin egr lpegr cooler syndrome. The limp mode 10 mins into a journey is a classic symtem. The engine asks for more input the cooler sieve is blocked restricting flow the ecu demands unfeasable flow from the hpegr and throws a p0401. It is easy to diagnose but very few garages know about it. Classic fiat dissemination of information.
First check exhaust pipe clean or sooty. A good engine should be squeeky clean. Sooty indicates a cracked dpf. Next question freeze frame info when p0401 is thrown. There are clues there. Live data will then confirm it (multiecuscan a good product for this) the lpegr opening will vary between 0 and 4.7 and few values in between , a good engine shows control with much more variation in value and not just on and off. The lpegr cooler temperature is also an indicator. The cause, poor software control of regeneration and injection. Edit (having wrong MAP sensors fitted at factory didnt help some people) Should be resolved with software updates and clean injectors , it is not inevitable. Though if youve got it it will cost a damned sight more. I have diagnosed over 20 engines with this issue. All that is needed (for diagnosis) is a10-15min blast up motorway (with a warm engine) and the data collected with Mes. A case of the error codes leading you up a blind alleyway. Ps this can also tell you that you havent got a problem. Read the links above.

Why does it not remain an issue on restart?

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[the1andonly]

Why does it not remain an issue on restart?

Initially it registers as pending, then next time a hard error. if you use even a simple code reader to delete the code you can last a couple of months, before it becomes impossible