Results 1 to 6 of 6

Thread: Another under-boost thread... probably

  1. #1
    Junior Member
    Join Date
    Jun 2019
    Posts
    3
    Post Thanks / Like

    Another under-boost thread... probably

    Howdy folks,

    This is my first post so please bear with me if I miss out important information. I'm looking for some help with an under-boost problem with my 2012 Passat BlueMotion Sport 2.0 TDI. The other day I was driving up a steady incline on a motorway and began to loose power, then the coil lamp came on. I stopped as soon as safe and using carista found the fault code P0299 - turbocharger "A" under-boost condition. I got the car home and, using the threads I've found on here and other forums, began to investigate.

    So far I've checked: vacuum hoses - all fine, boost control actuator - removed and sucked on vacuum hose - can't suck or blow any air through, moved the actuator mechanism manually - seems free enough, removed/replaced the actuator vacuum hose with engine idling - control rod moves and returns ok. The engine seems to rev ok when in neutral, torgue lite app doesn't indicate any boost pressure when driving, all other fields seems to work ok.

    I can reset the fault code, but it returns after a short drive, usually after revving over 2000. There's a noticeable lack of power, uphill is very poor. The engine seems to idle ok, and hasn't overheated. There's a noise coming from the turbo area at idle, sounds like a bearing rattling a bit. I haven't noticed any gradual drop in performance, the VAG DPF app I have says that's ok - soot at 8g and regen was 45 miles ago. I didn't use the car for a few weeks due to a broken collarbone, but did manage a few motorway drives before this happened.

    I'd be grateful for any more pointers, tricks or tips so I can try to at least find the problem without resorting to a garage. I'm reasonably good mechanically, i.e. I can take things apart and get them back together, but I haven't got much experience working on cars.

    Cheers.

  2. #2
    Administrator Keithuk's Avatar
    Join Date
    Jun 2012
    Location
    Stoke on Trent
    Posts
    14,505
    Post Thanks / Like
    First posts normally go in introductions else you could get a free fix and we never see you again!!!

    That's a common error code you can Google.

    VAG Error Code: 16683/15343/15343/14914/11226/12896/7384/5171/5671/000665
    EOBD II Error Code: P0299

    Fault Location:
    Boost Pressure Regulation - Control Range Not Reached/Low Boost

    Possible Cause:
    Malfunction Indicator Lamp (MIL)(K83) active.
    Reduced Power Output.
    Limp Mode.
    Limp mode: What is it, what are the causes, and how to fix it for the Audi and VW TDI diesel turbo

    Hoses/Pipes incorrectly connected, disconnected or leaking.
    Charger Pressure Control defective.
    Turbocharger faulty.
    Diverter Valve faulty.

    Possible Solutions:
    Check Hoses/Pipes to/between Components.
    Check/Clean/Replace Charge Pressure Control.
    Check Turbocharger.
    Check Diverter Valve.

    Special Notes:
    If the Turbocharger is faulty due to mechanical/internal problems or the exhaust system is restricted (typically the Catalyst) this fault may be the end result.

    Gasoline:
    When found in 2.0l TFSI:
    Check Boost Pressure Control Valve (N249) (Turbocharger Recirculating Valve) for cracked rubber diaphragm. A new/optimized Valve is available under Part # 06H-145-710-D (or newer).
    Rest of World (RoW) vehicles see: Technical Product Information (TPI) 2016331 for details.
    North American Region (NAR) vehicles see: Technical Service Bulletin (TSB) 01-07-70 or 2013392 for details.
    When stored in conjunction with misfire codes and/or fuel trim faults see the notes associated with the following faults regarding Positive Crankcase Ventilation (PCV) failure: Crankcase Breather Valve
    When found in Audi A4/S4/RS4/Cabriolet (8K): 2.0l (CAEB):
    See Technical Product Information (TPI) 2031245/6 - turbocharger excessive waste-gate play.

    Diesel:
    When found in VW Golf/Jetta (1K): 2.0l CR-TDI (CBEA/CJAA):
    Verify the mechanical part of the Exhaust Valve Control Module (J883) is not seized or binding.
    When found in the 1.9 L TDI-PD (BLS):
    Check vacuum supply from the vacuum reservoir located in the valve cover for leaks. Using a vacuum gauge, wiggle the valve cover and hose connections to check for a leak. The following photo was submitted from a customer working on a 2010 VW Caddy (2K chassis) with this vacuum reservoir problem.

    16683 / P0299 / 000665 - Boost Pressure Regulation: Control Range Not Reached



    Does Your VW/Audi 2.0t TSI Have A Bad Turbo




    As taken from my new EOBD II Fault Codes Software
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  3. #3
    Administrator Crasher's Avatar
    Join Date
    Apr 2006
    Location
    Nottingham, England
    Posts
    22,405
    Post Thanks / Like
    Sound like the turbo is clogged and will need a rebuild.
    2003 Skoda Octavia VRS Estate. APR 98RON remap, APR R1 diverter valve, Jetex exhaust, K&N panel filter, 7.5x18 Alutec Monstr 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:

  4. #4
    Junior Member
    Join Date
    Jun 2019
    Posts
    3
    Post Thanks / Like
    Quote Originally Posted by Crasher View Post
    Sound like the turbo is clogged and will need a rebuild.
    Thanks for the replies. I'd already investigated everything in the first post to the best of my abilities, with no success.

    It went into a local independant vw specialist last week, diagnosis is that it's the turbo that's gone. The mechanic said he's very sure the exhaust side turbine has either come off or lost some bits. Just over a grand to replace with a new one.

    Not the news i was hoping for. I've got no choice but to get it done and pray he's right and it's the end of it.

    Fingers crossed I'll be able to post a happy update in a week or so when I've had the work done.
    2012 Passat BlueMotion Sport 2.0 TDI-CR

  5. #5
    Administrator Crasher's Avatar
    Join Date
    Apr 2006
    Location
    Nottingham, England
    Posts
    22,405
    Post Thanks / Like
    They can do that but I would be more inclined to think it is just clogged and so 900 ish is more appropriate.
    2003 Skoda Octavia VRS Estate. APR 98RON remap, APR R1 diverter valve, Jetex exhaust, K&N panel filter, 7.5x18 Alutec Monstr 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:

  6. #6
    Junior Member
    Join Date
    Jun 2019
    Posts
    3
    Post Thanks / Like
    New turbo fitted, no other problems, car's running normally again. The exhaust side bearing had failed leaving the turbine free to rattle around but not spin. All is right with the world for now, which is nice.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •