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Discussion Starter #1 (Edited)
Hi All,

I love my car and have been nursing through its various strange issues since i bought it.
The latest issue i have looking at INSTA is:

244C00 - Charge Pressure control, High pressure stage control deviation: Charging Pressure too low / positive control deviation.

This is to do withe the small turbo at low load, low speed.

If i leave this fault code, this will stop the car from regening (according to INSTA).
I have just had the VAC hoses renewed as these were looking very tired, hoping that this would be the cure. Alas no - the code has returned.

The only other thing that the car does which is strange is when i turn off the engine. The electro-Pneumatic change over valve (the one at the front of the N57 engine chatters loudly for a few seconds. This is not normal, and i am sure that this is related to the fault code i am getting.

For clarity, the EGR has 'deleted' been mapped out.

Any ideas on this one gratefully received!

SOLVED:

Two parts to this one, VAC pipes that run over the turbo (surprise, surprise), and the pressure converter for the small turbo was leaky.. now all good.
 

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I am getting the same error on mine and the car has no power at all :(

I have renewed all vacuum lines.
Checked function of all 3 flaps with a vacuum pump.
I have also changed one of the pressure converters as I snapped a nipple off it.

Which pressure converter did you change? You say the small turbo one? However the small turbo is electronically controlled...

Thanks
 

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Discussion Starter #3
I thought i had fixed it, but no.

I will need to check the vacuum i am getting at Idle. How much vacuum do you get when your car is at idle. I cant help thinking that the VAC system still has a problem.

The symptoms are no boost before 2k RPM. I will see if i can active that actuator on the small turbo in ISTA, i am not sure if its possible or not?

Really frustrating....

Sorry not to have replied sooner
 

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Discussion Starter #4
Update:

Well i have taken the car to three garages to diagnose the lack of small turbo, A BMW main dealership in my home town. They could not diagnose the car as i have had the EGR mapped out, so just took my money and sent me on my way. Another who replaced all the VAC pipes and pressure converters. The fault still remained, so i thought i had better go to a specialist - Turbo Technics in Northampton.

Before i went down this route, i called them and asked what their diagnosis consisted as plugging the car into the computer wont help them find the problem (as i had done this many times). They assured me that they had dealt with thousands of turbo related issues, and they have the right experience to take care of these things.
Armed with that knowledge i set out on my journey to Northampton to get my car sorted out. The end of an epic journey i thought.

I left the car with them for the morning and received a call that afternoon, saying that they are not really sure what is wrong, and they cant get replacements parts for the turbos, so i would be looking at replacing both turbos with new units (as the small one not working will have affected the large turbo so this would likely fail soon) at an all in price of £5044.60 inc VAT.

I pointed out that i had printed off some documents from ISTA and asked them to test the actuator flap, but when i asked them if they had looked at this they said no.
I paid my inspection fee, and left, still in a state of shock.

With nowhere else to turn, i ordered a cheap VAC pump from Amazon, and this was delivered the following day. within 5 mins, i had checked that the car VAC system was working as intended, and in a further 5 mins had confirmed that the vacuum canister that controls the flap that diverts the exhaust gas between the big and small turbo could not hold a vacuum, so could not move the actuator to divert the exhaust to the small turbo.

Now the fault is diagnosed, i can get it repaired.

I am cross with myself that i did not do this earlier, but pleased that i know for sure what the issue is. To replaced the VAC canister, you need to take the small turbo off, so will have this cleaned while this is done.

Fingers crossed this long running saga is coming to an end, and one day i will be able to look back at all this and laugh.
Without ISTA and a £14.99 VAC pump, i would still have no low end power...
 

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Wake up an old thread.
Sheriff can you please send a long way to this vacuum pump or valve?
I have the exact same error and my car is optimized with step 2 egr off.
This error code 244C00 arrives at low lap speed between 100-120 km h
 

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Struggling with this error myself on a 525d. I have removed egr valve and inlet manifold, throttle valve etc, badly enough sooted, gave a super clean and replaced all seals and gaskets. Upon reinstalling i found a potentially frayed vacuum hose above the turbos close to connection with a think a pressure convertor. I think the vac lines are 3mm. Anyone have a link for this vac hose or i am better getting from dealer??
 

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see pic attached for suspected frayed vac line, anyone have a part number for this F11 525d 160khw 218bhp 2015. i suspect it is frayed just at the Changeover low pressure compressor bypass flap, it is also a low pressure error i am getting
 

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Help needed.

I have troubleshoot the error to the compressor vac cannister not holding a vacuum. however BMW have said they do not supply these seperately. Does anyone know where to get these membranes replaced/repaired or have a part number

Number 4 in diagram
 

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see pic attached for suspected frayed vac line, anyone have a part number for this F11 525d 160khw 218bhp 2015. i suspect it is frayed just at the Changeover low pressure compressor bypass flap, it is also a low pressure error i am getting
Well did you sorted or still pending gwttinv same error on mine 525d f10
 

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Well did you sorted or still pending gwttinv same error on mine 525d f10
Yes....it was a faulty pressure converter. I tested them with a vacuum gauge and the engine running....I cant remember the exact test but if you Google pressure converter test you will be able to tell if it is that.
There were 2 on my car and are fairly easy to access and and change. Located at the top LHS of engine block attached to block just above the exhaust manifold if I remember correct. If you locate the vac lines you should be able to trace it to them
 

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Well did you sorted or still pending gwttinv same error on mine 525d f10
I also had a vac canister not holding vacuum which was easy to diagnose with the vac pump. I replaced the canister membrane however the error returned so that was not the issue..Once i replaced the faulty pressure converter I could fell the difference straight away
 

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Hi.

I randomly get error 244C00 also.
Happens when at low RPM and engine is cold. I don't seem to have any power issues. The error appears and goes away straight away but it's annoying. Also a bit of a rough idle on cold starts that lasts about 30 seconds.
No other issues.

Do you think the pressure converter could also be giving me this fault like you?

I have ISTA + so can check readings etc.

Thanks for any help. Would be much appreciated.

Chris.
 

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It does sound like the same symptoms i had for the error and no loss of power so it is very possible it could be the pressure converter. I cant remember how I tested but I think I connected a vacuum pump with engine running. Would be best to test and identify first but pressure converter wont set you back too much compared to main dealer diagnostic....I'm no mechanic and I cant say for sure but there were a lot of other variables I tested first before i identified converter,leak on vac lines,vac canister leak all could give same code
 

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Hi grantbp.

Really appreciate your reply.

I have ISTA + now. Fully working.
I've ran alot of tests but I'm just not entirely sure what I'm looking for or the differences in actual and expected values. I know how to measure live data for EGR, Injectors and things like that.
The lumpy idle for 30 seconds or so in the morning is driving me mad! Car shakes a tiny bit for a couple of seconds like its struggling for air or fuel or something.
I'm a bit confused about location. Seen some people mentioning the connection at the very front of the engine with the red and black vacuum lines going to it. Its only small. Then you have the people talking about the one at the back left of the engine bay if looking from the front of the car.
Just started it. The boost doesn't look right (pic attached)
269232
but again I'm not sure how close to expected is acceptable and what is defined as faulty?
I also thought the EGR % would be 0 when first started?

Sorry for going on a bit.

Thanks again.
 

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I dont know about your rough idle,maybe engine sooted up needs a good clean out??? I don't have experience with that or know if it is related.
You need to get a hand held vacuum pump..15 quid on amazon.
Disconnect the lines ista test tell you on the troubleshooting flow and see if they hold a vacuum.
For the pressure convertor connect to vacuum gauge and start engine....I think you should see some vacuum the one that doesnt could be faulty....like I say I cant remember but it was something like that.. anyway you can do swap tronics on it
To find location go to real OEM and enter you vin....search and you will be able to find where it is located for your car
 
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