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  1. #1
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    Jul 2012
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    Power Loss over 50mph - P0234 Turbo Overboost Condition

    Hi,

    My Touran has developed a serious issue - whenever I take it above 50-60 MPH it loses power - you can push the accelerator down and nothing happens. There is a whining noise coming from underneath the bonnet and the engine sounds a bit croaky.

    After having the RAC man look at it, he produced the error code p0234 - Turbo Overboost Condition.

    Took it into a VW dealership and they replaced a wiring loom under a "TPI" they had. At 22k miles they thought it was far too early for the turbo to have failed, which is what similar searching on this forum would lead me to believe is the actual issue.

    Anyway, the replacement loom hasn't fixed the issue - the power still cuts out over 50-60. The emissions warning light has come on and off too.

    It's back with another main dealer at the moment and I was just looking for some advice really - what questions should I be asking? The car is covered by a 1 year used VW warranty (which didn't cover the wiring, annoyingly). Up until now it's been the best car I've ever owned, so I'd like to make sure it gets put right, so any advice, theories or suggestions would be most welcome.

    Thanks!
    Touran 2008 "Facelift" 2.0 TDI SE Manual 6 Speed Gearbox, 7 Seats

  2. #2
    Administrator Keithuk's Avatar
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    Welcome to the forum Dan.


    VAG Error Code: 16618
    EOBD II Error Code: P0234

    Fault Location:
    Boost Pressure - Regulation Limit Exceeded (Overboost Condition)

    Possible Cause:
    Malfunction Indicator Lamp (MIL)(K83) ON.
    Boost Pressure too high.
    Reduced Power Output.

    Hoses incorrectly connected, disconnected, blocked or leaking.
    Boost Pressure Control Valve (N75) faulty.
    Boost Pressure Sensor (G13) faulty.
    Turbocharger (TC) stuck/faulty.

    Possible Solutions:
    Check Charge Pressure Control System.
    Perform Output Test (to check the Turbocharger (TC)).
    Perform Basic Setting (to check the Charge Pressure Control).
    Perform Pressure Test to locate Leaks.
    Check/Replace Boost Pressure Control Valve (N75).
    Check/Replace Boost Pressure Sensor (G13).
    Check/Replace Turbocharger (TC).

    As taken from my EOBD II Fault Codes Software
    Last edited by Keithuk; 09-09-12 at 20:49. Reason: Update
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  3. #3
    Junior Member
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    Thanks Keith,

    The TPI (I'm not sure I know what that is) the original work was done under was 20120305/12 - fit additional wiring loom from ECU to charge pressure sender.

    Given the noises I'm hearing, and other posts on the forum, I'm pretty sure it's the turbo but I'm wondering if there's anything else I should be thinking about as 22k seems very low for a turbo issue.

    It's with another main dealer now so hopefully they'll be able to restore my Touran to health.

    Having driven the 2012 Touran 2.0 TDI I must say it's very quiet compared to my 58 2.0. I don't hear a noise like a police siren or a loud whine.
    Last edited by Dan001; 09-09-12 at 21:07.
    Touran 2008 "Facelift" 2.0 TDI SE Manual 6 Speed Gearbox, 7 Seats

  4. #4
    Administrator Crasher's Avatar
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    The turbo needs a rebuild, very common on the BKD engine. I have just done one on a car with 16K miles from new.
    2003 Skoda Octavia VRS Estate. APR 98RON remap, APR R1 diverter valve, Jetex exhaust, K&N panel filter, 8x18 Wolfrace Pro-Lite eco 2.0 wheels with 225/40 18 Uniroyal Rainsport 3 tyres.
    2006 Polo GTI 1.8T, APR 95RON remap
    1988 Golf 2 GTI 16 valve, 2.2 with Weber Alpha injection
    1983 Golf 1 GTI 8 valve, 2 litre with Eurospec racing 42/36 head
    1972 1302LS auto 1641cc conversion

    Vile Invention

    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:

  5. #5
    Member tonyuk74's Avatar
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    Power Loss over 50mph - P0234 Turbo Overboost Condition

    Whats the problem with the turbo crasher. Keep hearing about these turbo faults it I'm starting to get a bit worried now lol. My jetta is just coming up to 70,000.
    2006 Jetta 2.0 TDI Sport, Eng Code: BKD

  6. #6
    Administrator Keithuk's Avatar
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    Quote Originally Posted by Dan001 View Post
    The TPI (I'm not sure I know what that is)
    Who has mentioned TPI Dan?

    As a general rule lubrication has been a problem with a turbo failure so you need to change the oil and filter at the specified intervals and use the correct grade of oil. Oh and don't rev it up before you switch it off, turbo's will spin at 240,000 rpm on full chat.
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  7. #7
    Junior Member
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    Hi Keith,

    The TPI came from the VW dealer who had a go at fixing the problem - the additional wiring loom didn't fix the problem, unfortunately.

    Car has full service history and has only been done at the source main dealer - log book indicated oil and filters have been changed as per schedule.

    It's with the source main dealer now so hope they get it fixed.
    Last edited by Dan001; 10-09-12 at 09:15. Reason: Extra info.
    Touran 2008 "Facelift" 2.0 TDI SE Manual 6 Speed Gearbox, 7 Seats

  8. #8
    Administrator Keithuk's Avatar
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    Technical Product Information (TPI) and Technical Service Bulletin (TSB).
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  9. #9
    Senior Member
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    Jan 2012
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    York
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    The variable vanes stick in the turbo normally and cause the overboost code, There are various checks first before you can be sure its the turbo, Have come across a few whining turbos on the bkd engined pd. The vw dealership should be able to sort and diagnose your problem easy,They should have all the technical back up and experience of this problem. if not suggest taking it to another dealer who knows what they are doing.
    2007 Touran Sport 2.0T TDI 170PS, Engine code: BMN

  10. #10
    Junior Member
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    Home dealership have the car and are sorting it out. It's a shame the other dealership charged us money and didn't fix the issue.

    Full turbo replacement under warranty. Apparently the existing part was non-serviceable!

    Out of interest, is there a good way to treat the turbo? We haven't owned the car that long and I was just wondering why these things fail - is it the design of the engine, driving patterns, bad luck, a mix, or something else?

    Thanks all for your advice and help - it's always appreciated. I love the Touran so it will be a pleasure to get it back, although I'm impressed by the swanky new gear box and dash on the 2012 model.
    Touran 2008 "Facelift" 2.0 TDI SE Manual 6 Speed Gearbox, 7 Seats


 
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