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Technical Error code P0236 & 0238

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Technical Error code P0236 & 0238

@jansla thanks for the extra details on the MAP sensors. No you are not the only one who had the wrong sensor fitted in the factory, @Fredastaire reported this many moons ago. I think incorrect/ different differential DPF sensors were also fitted for a while as an alternative due to correct specified being unavailable (cynics might suggest a cost saving exercise).
 
I include this here as being aimed specificaly at P238 (The main discussion relates to a 2012 150 engine)
Extract from a german Ducato website

The error P0238 is a diagnosed electrical fault of the AD (Analog / Digital) converter in the ECU (Engine Control Unit):

Definition:
Turbocharger-Supercharger Boost Pressure Sensor Circuit High

Description:​
The (K37) Boost Pressure Sensor Signal circuit voltage is above 4.9 volts for 2.0 seconds.

Cause:
  • 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE --> the 5 volt voltage generated in the ECU has a connection to the operating voltage
  • BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE--> the measuring line from the sensor to the ECU or in the ECU has a connection to the operating voltage
  • BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE 5-VOLT SUPPLY CIRCUIT-->the measuring line from the sensor to the ECU or in the ECU has a connection to the 5 volt voltage
  • SENSOR GROUND CIRCUIT OPEN/HIGH RESISTANCE --> Sensor ground connection open or high impedance
  • BOOST PRESSURE SENSOR-> Sensor defective
  • POWERTRAIN CONTROL MODULE (PCM) --> Powertrain control unit
  • I would make a data recording of the pressure and temperature value. If there is an electrical defect there is no continuous curve, but one with jumps and peaks and dips due to a loose contact in the wiring harness or moisture....
 
Hi @theoneandonly and @Fredastaire
I’m sorry to bother you again but
I am really desperate.
We upgraded our camper for 30k and now have the same problem.
The workshop wants to replace the DPF and the turbo. That's over 10k that we don't have.
Have you been able to find a solution for your vehicle?
We have installed the correct MAP sensor. EGR replaced (new) and air filter replaced.
I would be so grateful for any feedback.
 
@Ganterl there is a 77 page post on this forum that I started a couple of years back. It's a long slog but the whole extent is detailed there.
.
You need to be aware that the problems we detail are for the twin EGR (non adblue) euro 6 variant manufactured late 2016 through to late 2018.
.
Is this description applicable to your van.
.
If yes then together with @theoneandonly we can steer you though proper analysis / fault finding.
.
It's confusing that you mentioned replacing the EGR, as if your van is our spec you have two, not one.
.
Clarify the spec of your van and we will discuss further.
.
Is your 'garage' a fiat main dealer?
 
@Fredastaire
Thank you for the quick reply!
We have a Fiat Ducato Multijet (177hp 2.3 l) built in 2017.
As I have read, we have to classify ourselves in the LPEGR problem incl. DPF failure, correct?
Yes, our ducato is placed at a Fiat professional main dealer since sept. 2024.
I found the 77 page post manually (the link on slide 3 did no longer worked) and commented there :) !
Shall we rather continue the conversation there?
 
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Ganterl said:
Shall we rather continue the conversation there?
Click to expand...
yes good idea. but read these guides first a bit more compact than 77 pages

Twin EGR Problem

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

In order to really diagnose your problem we will need to see live data collected from a running engine. This may be difficult if you havent got acess to your van. A working copy of Multiecuscan would be usefull.
 
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@Ganterl from me it's also a yes to continue on the bigger post. I do though recommend that you initially get your van back from the dealer and having bought Multiecuscan run some tests with @theoneandonly. I suspect you have a blocked cooler, that will be causing the turbo to lag because it's strangled. That will be why the dealer is seeing the turbo not working so he wants to replace it. I'm going to be brave and say that we most likely know more about the problem than main dealers. At this point I doubt if there's anything wrong with your turbo.
So far I've gone down the lower cost option of replacing the LP EGR cooler twice, it's cheaper on average for me than fitting a new DPF. I expect the cooler to block again in two years time. I suspect your dealer doesn't know how the LP EGR works, if he doesn't replace the cooler then the proposed repair of just a new DPF and new turbo just won't work.
.
Multiecuscan will provide the clues to the problem and lead to a chosen repair scheme
.
I'm off to bed as it's late.....
 
Okey, you’re amazing guys! :D
I'll contact the garage on Friday and say we'll try it ourselves... unfortunately they said the last time we were there, that once we've collected the van, they won't take it back :(
I'm currently finding out which Multiescan we need to buy & which software. As soon as I've found something, I'll get back to you on the “big post” :)!
 
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@Ganterl - before you cut the tie with your garage you need to ask them about which issue software is installed. You need either v28 or v32. It's a 'must' that you have this before the van leaves them. @theoneandonly any other thoughts?
 
@Ganterl IF you can get updated to v32 I would. soon as you get van back and multiecuscan sorted do a data collection run.
attached is my template 4 take a run by engine running for 10 mins (short journey to warm up) then if possible a run up motorway for 10-20 mins @60mph .
Screenshot (342).png


Tutorial to Measure specific Engine PIDs (Parameter ID) and Save data for analysis.

This was originally written to help one person with his Ducato totally new to MES to start saving data. it is not an exhaustive manual nor intended to be. Tutorial to Measure specific Engine PIDs (Parameter ID) and Save data for analysis. Open...
www.fiatforum.com
 
@theoneandonly oh.. due to our limp mode (coming up 1-2 minutes after starting a ride) it’s impossible to reach 60 mph. We will try our best to reach 10 min with 50 mph on our highway close to the garage. Hope this is fine.
Which recording should we make? Continuously? 10 min at a standstill by engine running and then towards the highway ride (10-20 min at @50mph)?
 
Ganterl said:
@theoneandonly oh.. due to our limp mode (coming up 1-2 minutes after starting a ride) it’s impossible to reach 60 mph. We will try our best to reach 10 min with 50 mph on our highway close to the garage. Hope this is fine.
Which recording should we make? Continuously? 10 min at a standstill by engine running and then towards the highway ride (10-20 min at @50mph)?
Click to expand...
continuous from start to park, i will slice it up as necissary.
 
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