Technical Engine codes 236 and 238

[Spartacus72]

I have a 2018 Fiat Ducato 130hp based motorhome.

About a month ago, i got the amber engine light along with codes 236 and 238. The van drove fine for a while before dropping to limp mode. After shutting the engine off for a while, it started fine but then did it again. I am also getting 2002 which is the DPF, although I suspect the issue with the DPF is a consequence of the Turbo pressure. I have told my local garage to focus on the Turbo codes as the DPF is hard to get to, and I (personally) expect they will resolve once I can go on a good motorway run at full power.

Before I could get it looked at, switching the engine off and on again, cleared the limp mode for a while. It does not anymore. Although, the engine light remains on, when starting in the morning it often (but not always) drives ok for a short period of time. You CAN hear a "whooshing" noise through the habitation door, or better with the drivers window down. This noise STOPS completely when it drops into limp mode.

The garage has had it in once, and can't easily find any split pipes. They are arranging a smoke test on Tuesday.

Has anyone experienced anything like this? I am (suspecting) a hole in the intercooler. Does this sound feasible? probable?

 

[theoneandonly]

I have a 2018 Fiat Ducato 130hp based motorhome.

About a month ago, i got the amber engine light along with codes 236 and 238. The van drove fine for a while before dropping to limp mode. After shutting the engine off for a while, it started fine but then did it again. I am also getting 2002 which is the DPF, although I suspect the issue with the DPF is a consequence of the Turbo pressure. I have told my local garage to focus on the Turbo codes as the DPF is hard to get to, and I (personally) expect they will resolve once I can go on a good motorway run at full power.

Before I could get it looked at, switching the engine off and on again, cleared the limp mode for a while. It does not anymore. Although, the engine light remains on, when starting in the morning it often (but not always) drives ok for a short period of time. You CAN hear a "whooshing" noise through the habitation door, or better with the drivers window down. This noise STOPS completely when it drops into limp mode.

The garage has had it in once, and can't easily find any split pipes. They are arranging a smoke test on Tuesday.

Has anyone experienced anything like this? I am (suspecting) a hole in the intercooler. Does this sound feasible? probable?

from my spreadsheet of codes (various sources)

P2002​

Resistance to air flow in high particulate filter, Plausibility​

This leads me to think differential DPf sensor or pipework, not neccissarily the dpfitself as some websites suggest (non fiat motors)

this was also alluded to in a previous thread. though no conclusions posted.
Your noise is more disconcerting, have you any other codes? a 401?
Have you got Multiecuscan or access to it (

MultiECUScan

Help, tips and advice for using MultiECUScan.

www.fiatforum.com

have a read of

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

may not be relevent yet.

 

[Spartacus72]

As I said, I am really not concerned with the DPF code. I think the DPF will regenerate once I can get the van onto a decent motorway run at full power.

What I have noticed is that the van, even though the engine management light (mostly) stays on (once or twice recently it has been off in the morning), the power from the van is (ok) at first startup and city (30mph) speeds. Once the engine reaches temperature, it tends to be easier to trigger limp mode.

After limp mode it doesn't have any power, and mostly doesn't want to go more than 30mph unless downhill.

I suspect a hole in the intercooler.

its going in for a smoke test tomorrow as last week the garage couldn't find a cracked pipe.

I would welcome thoughts if anyone has had similar experience, if for no other reason than to point my garage towards what might save them time and me money.

 

[theoneandonly]

does it typicaly trigger limp mode on the overrun ie no throttle off load?

 

[Spartacus72]

does it typicaly trigger limp mode on the overrun ie no throttle off load?

Sorry, I don't understand the question. I don't what "overrun" or "no throttle off load". means. sorry.

 

[theoneandonly]

Sorry, I don't understand the question. I don't what "overrun" or "no throttle off load". means. sorry.

foot off throttle pedal. is this when error is triggered ?

 

[Spartacus72]

foot off throttle pedal. is this when error is triggered ?

I don't (think) it has ever triggered except under some sort of load. My expectation was a split hose, but the garage couldn't find one. Smoke test is booked for tomorrow, so i guess that (hopefully) will find the leak...I still suspect the intercooler.

I don't suppose you (or anyone) knows what limp mode actually does; I mean technically, not just limits power. I assume it shuts down the turbo; anything else specific?

 

[theoneandonly]

I don't (think) it has ever triggered except under some sort of load. My expectation was a split hose, but the garage couldn't find one. Smoke test is booked for tomorrow, so i guess that (hopefully) will find the leak...I still suspect the intercooler.

I don't suppose you (or anyone) knows what limp mode actually does; I mean technically, not just limits power. I assume it shuts down the turbo; anything else specific?

if incorrect data is received (can be a number of things hence all the error codes, not all will throw a mil at first error) shuts down turbo and limmits the revs to about 2500 (depending on vehicle). my skoda with an air leak at throttle body would throw one at 3000 but then limit to 2500
Its quite possible that the rev limmit is dependent on the error.

 

[Spartacus72]

if incorrect data is received (can be a number of things hence all the error codes, not all will throw a mil at first error) shuts down turbo and limmits the revs to about 2500 (depending on vehicle). my skoda with an air leak at throttle body would throw one at 3000 but then limit to 2500

Thank you. I was kind of looking for more specific information from a technical perspective on this specific vehicle. I guess that's hard to get. But thanks.
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