Technical Fault code p0238 boost sensor.

[deejays]

This fault may be caused by a blocked LPEGR cooler :

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

@jansla I am very much thinking there may be two issues at play here. One is a blocking cooler, and the other is there is something amiss with the Turbo Actuator Command. So, perhaps both the chicken and the egg are in play. And speaking earlier of reverse engineering, I suspect we (at least I)...

www.fiatforum.com

 

[Jykke]

Thats great info, thanks for that.
I dont have multiscan but should probably get it, I have Vdash for my Volvo and its proven useful.
You sound very knowledgeable about these engines,. If I just have the EGR mapped out will this (likely) stop my problems?
I have noticed that the engine can be mildly erratic, for E.G. getting mild surges of acceleration when I haven't changed the throttle position

hi!

i have a 2019 ducato with a 2.3 engine.
sometimes it accelerates a little like my friend, the error code is po238.. have you found out what was wrong with you?
many thanks.

 

[Jykke]

Thats great info, thanks for that.
I dont have multiscan but should probably get it, I have Vdash for my Volvo and its proven useful.
You sound very knowledgeable about these engines,. If I just have the EGR mapped out will this (likely) stop my problems?
I have noticed that the engine can be mildly erratic, for E.G. getting mild surges of acceleration when I haven't changed the throttle position

hi!

i have a 2019 ducato with a 2.3 engine.
sometimes it accelerates a little like my friend, the error code is po238.. have you found out what was wrong with you?
many thanks.

 

[Rapido8]

hi!

i have a 2019 ducato with a 2.3 engine.
sometimes it accelerates a little like my friend, the error code is po238.. have you found out what was wrong with you?
many thanks.

hi!

i have a 2019 ducato with a 2.3 engine.
sometimes it accelerates a little like my friend, the error code is po238.. have you found out what was wrong with you?
many thanks.

 

[Rapido8]

Hello jykke

Same problem. I have some ideas. If you want to talk call 0456737317

 

[Jykke]

Hello jykke

Same problem. I have some ideas. If you want to talk call 0456737317

Moro!
Missä asut? Olet siis suomesta?

 

[Rapido8]

Moro!
Missä asut? Olet siis suomesta?

Hei, asun Tampereella. Minulla 2019 2,3 150hp malli. Autoon vaihdettu jonkinverran osia mutta antaa edelleen turbon vikakoodia ja tekee ajossa kiihdyttelyä. Epäilen että vika on alemman egr venttiilin toiminnassa tai itse turbossa. Onko sulla asiaa tutkittu tai vaihdettu osia?

 

[theoneandonly]

The important thing to che k is the turbo solenoid

Turbo solenoid test

This discusses the option to test the (turbo solenoid)boost valve in MultiEcuScan.

www.fiatforum.com

And

DPF Differential Pressure sensor Diagnosis with MES

How to diagnose a problem the DPF Differential Pressure sensor and its impact on the DPF. known in mes parameter list as Differential Pressure Sensor. These sensors are prone to any debris or condensation in the exhaust, which can cause the...

www.fiatforum.com

Without additional codes lpegr problems are uniquely
Take live data on a warm engine of the turbo parameters and differential dpf data (template 7)
If you put the csv data here I will look at it (when home from holiday)

 

[Jykke]

Hei, asun Tampereella. Minulla 2019 2,3 150hp malli. Autoon vaihdettu jonkinverran osia mutta antaa edelleen turbon vikakoodia ja tekee ajossa kiihdyttelyä. Epäilen että vika on alemman egr venttiilin toiminnassa tai itse turbossa. Onko sulla asiaa tutkittu tai vaihdettu osia?

Terve!
Hyvä ettei tarvi kieltä nyt kääntää kun en osaa englantia.. laitan sulle wa..

 

[theoneandonly]

Without additional codes lpegr problems are unlikely.

earlyier on in thread it is mentioned that without a P0401 code the blocked lpegr cooler is possible but not the first cause or common. To asses this use the templates in the egr guides


Translation aps do make life easier, if not always accurate

Käännössovellukset helpottavat elämää, vaikkakaan eivät aina ole tarkkoja

 

[daroya]

I’m currently experiencing this exact problem with my 2017 130 Ducato. 100k miles
Limp mode almost every time I use it as it comes up to operating temp, a quick ign off/on and we’re away again just with the EML showing.
The codes I get are mainly P0401 which is EGR level not as expected, but also P0238 as above.. so I decided to replace the MAP (manifold absolute pressure) sensor.
That is a bit of an awkward thing to get to (a good 30 mins + of stripping bits off until you can see it… then the bloody fixing screw sheared in half! And I couldn’t get the broken half out (it sheared again at the base while I tried)
So I had to bodge the new MAP Sensor in with JB weld (as the only other option would be to replace the entire plastic inlet manifold)..

Anyway I’m still getting the errors!.. granted seemingly less frequently, but often enough to be annoying.

My next step is to clean out (or possibly remove) the EGR

This is a pic of the sheared sensor locating screw
Conway tint

The recurring P0238 on your 2015 2.3 Maxi Ducato is usually caused by wiring or ECU issues rather than the sensor itself. Check the sensor harness and connector for damage, corrosion, or loose connections, especially near the turbo and ECU. Also inspect for intake leaks, boost overpressure, or poor ECU grounding. If wiring and boost path are fine, a software update or ECU reflash may resolve false high readings. Replacing the sensor again alone is unlikely to fix the problem.