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Unread 02-01-2011, 07:27 AM   #1
Peter59
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Dct p0234

In my 2006 Liberty 2.8 CRD (11.000 km !!) the DTC P0234 comes on every time after driving 4-5 km.
This occurs only at cold wether (below 0 Celsius).
In warm conditions there is no problem.
I checked the vacuum lines (the engine is like brand new), exchanged the pressure sensor at the intake manifold, the rod down to the turbo is also moving correctly with vacuum.
I cleaned the mass flow sensor.

Does anyone have an idea what else I can do ?
My workshop does not.


Last edited by Peter59; 02-01-2011 at 11:46 AM..
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Unread 02-01-2011, 08:52 AM   #2
95BadBoy
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First post - Welcome to JF -

Did your shop also clean the MAP sensor by any chance? If so, how?

Has your mech checked the turbo hoses for any cracks/leaks by removing and visually inspecting them?

Have you unplugged the MAF to see if it runs better or worse. Inspect the wiring to the MAF, what did you use to clean it?
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FS or FT (2) JK Rubi 17" Moab Rims - really nice shape
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Unread 02-01-2011, 09:25 AM   #3
Peter59
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The MAP Sensor is new, and I disconnected the battery to relearn it.
The turbo hoses are nearly brand new, I could not find any cracks.
I cleaned the MAF with brake cleaner and air-dried it.
All the wiring is also OK - this car ran just 11.000 km in 5 years.
I will try driving without MAF, but I think it will go in limp mode, which my not make sense.
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Unread 02-01-2011, 10:28 AM   #4
95BadBoy
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You should not go into limp mode by disco'ing the MAF. It will lite up a CEL - but simply not allow the EGR to function if you have that on your Euro CRD.

Another thought on your issue could be sticking turbo vanes to get the the P0234 over-boost code - but you stated already that you are getting proper movement in correlation to vacuum.

If we get lucky today, maybe Kieth from GDE may pop in with a bit more insite .
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05 TJ RME 42RLE with some things
05 KJ CRD 545RFE, GDE Eco tune, Franky II, Al's 4.5 A-arms, JK Rubi Moabs, Silent Armors 245-70-17's, Spidertrax Adapters, Rola Basket, Fumoto Valve, Pinch welds pounded

FS or FT (2) JK Rubi 17" Moab Rims - really nice shape
Need JK Rear Spare tire bracket for project
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Unread 02-01-2011, 11:44 AM   #5
Peter59
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I just came back from test driving with MAF disconnected - you are right, no limp mode, but a little less power.
Unfortunately the P0234 occured again.
It is always at around 1700 rpm and 60-70 km/h with very low gas (gliding) and cold wether.
Under these driving conditions I need nearly no power from the turbo, that`s what I`m not understanding.
This P0234 should be an overboost condition acc to the OBD-Tester I have.
In the Jeep repair manual it`s a low turbo condition - what is true ?
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Unread 02-01-2011, 01:43 PM   #6
95BadBoy
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Glad to hear that the MAF disco worked for you. On this side of the pond - many used to do that quite often to bypass the functionality of the EGR prior to the new tunes available to us now from the Green Diesel Engineering (GDE) crew.

To my understanding - that code gets thrown for an overboost situation. And can be a bugger to chase down.

Do a search on here for GDE, and send Kieth a PM and explain your issue. Just possibly they may have better ideas on your issue. I would think you would hear back within a day. Merlintec is another you might PM - he is a master tech based out of the UK I believe.
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05 TJ RME 42RLE with some things
05 KJ CRD 545RFE, GDE Eco tune, Franky II, Al's 4.5 A-arms, JK Rubi Moabs, Silent Armors 245-70-17's, Spidertrax Adapters, Rola Basket, Fumoto Valve, Pinch welds pounded

FS or FT (2) JK Rubi 17" Moab Rims - really nice shape
Need JK Rear Spare tire bracket for project
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Unread 02-01-2011, 03:08 PM   #7
Peter59
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I got no experiance yet in searching the forum.
How does it work ?
What is PM ?
How can I get in contact with GDE ?
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Unread 02-01-2011, 03:41 PM   #8
95BadBoy
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A couple of inches down from the top of the page, it starts with like users CP, the sixth one to the right is the search button & it will give you options on what you want to search for. Unlike some forums, this search actually works pretty decent.

Once you search and find what or whom you are looking for, say GDE - you click on the user name (yours would be Peter59) it will give an option to send a PM (personal message) which will send that person an e-Mail that they have a message. Next time they check EM - they will see that they have a message on JF. Just gives a way to direct contact someone and not use the open forum.

GDE < Web link - see contact part for phone #
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05 TJ RME 42RLE with some things
05 KJ CRD 545RFE, GDE Eco tune, Franky II, Al's 4.5 A-arms, JK Rubi Moabs, Silent Armors 245-70-17's, Spidertrax Adapters, Rola Basket, Fumoto Valve, Pinch welds pounded

FS or FT (2) JK Rubi 17" Moab Rims - really nice shape
Need JK Rear Spare tire bracket for project
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Unread 02-02-2011, 01:03 AM   #9
Peter59
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Thank you !
Best regards from Austria.
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Unread 02-02-2011, 05:44 AM   #10
95BadBoy
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Glad that this small bit of information might be of some help.

Please post up with any progress or resolutions as they present themselves, as other members can always learn from specific tricks or fixes. You can also post pics of things as move along.
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05 TJ RME 42RLE with some things
05 KJ CRD 545RFE, GDE Eco tune, Franky II, Al's 4.5 A-arms, JK Rubi Moabs, Silent Armors 245-70-17's, Spidertrax Adapters, Rola Basket, Fumoto Valve, Pinch welds pounded

FS or FT (2) JK Rubi 17" Moab Rims - really nice shape
Need JK Rear Spare tire bracket for project
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Unread 02-11-2011, 08:42 AM   #11
Peter59
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Bad News

Now it is solved.
It was a missing software-update concerning glow plug electronics which is throwing the P0234 error - nobody knows why.
I am happy now.

Last edited by Peter59; 02-18-2011 at 08:11 AM..
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