Technical Ducato x250 2.3 MJ 2012 limp mode, turbo position

[Mertz]

Hi, I've been searching for a solution to a problem with my car going into limp mode and showing multiple error codes.

The issue is that under engine load in 4th, 5th, or 6th gear, there's a sudden drop in power, and it triggers a boost-related error (P0237-61, P0238-61, P0234-62, and probably some others that I haven’t had a chance to note down). After clearing the error and restarting the engine, everything returns to normal, and as long as the engine isn’t too heavily loaded, the error doesn’t appear.

I've already checked the Pierburg valve, boost pressure sensor, airflow meter, and intake tightness, and everything seems fine. Recently, I took some logs in MES, and one thing caught my attention – the relationship between the expected and actual turbo position. Specifically, the actual position never exceeds around 3.700 mm.

Could this indicate a stuck variable geometry? Or could it require adjustment?

 

[bugsymike]

Have you checked for leaks in the intercooler and pipes etc. from turbo onwards to engine?
Maybe even a "smoke test".
I have had a VVT turbo stuck on a daughters VW Golf GTD 130 and was able to free it with foam additive/spray cleaner etc. Along with regular use of fuel additive. Problem mainly caused by lack of use of the go pedal in her case.

 

[Mertz]

Have you checked for leaks in the intercooler and pipes etc. from turbo onwards to engine?
Maybe even a "smoke test".
I have had a VVT turbo stuck on a daughters VW Golf GTD 130 and was able to free it with foam additive/spray cleaner etc. Along with regular use of fuel additive. Problem mainly caused by lack of use of the go pedal in her case.

I checked the tightness of the pipes, but perhaps not thoroughly. Do you think that the turbine stopping at this one specific position could be caused by a leak, for example, in the intercooler?

 

[bugsymike]

I checked the tightness of the pipes, but perhaps not thoroughly. Do you think that the turbine stopping at this one specific position could be caused by a leak, for example, in the intercooler?

A proper "smoke test"would help at least eliminate one area.
When you say "Do you think that the turbine stopping at this one specific position could be caused by a leak, for example, in the intercooler?", if you mean when it goes into "limp mode" then yes as it throws out the turbo readings that the engine is expecting.