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    Thread: 2013 VW CC Weird Noise

    1. Semi-n00b
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      May 16th, 2016
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      2013 VW CC Sport Plus
      05-17-2017 11:43 PM #1
      About 2 weeks ago, my VW tech did a carbon clean on my CC's intake manifold (only 44k miles). Since then, I've been hearing this loud whistle\chirping noise whenever I accelerate the car. It only happens during acceleration. I tried replicating the problem when the car is parked but I don't hear that weird noise at all. I notified the tech and he said it could be a bad diverter valve. He replaced that today and still the noise is there when I accelerate. I know the mechanic removed the air box and air intake when he did the carbon clean. I've checked all the hoses and clamps and they look to be in place correctly. The VW tech said it's a possible turbo issue but he's not sure. The engine runs smooth, no loss of power, no engine light. Only that weird noise.

      Has anyone experienced this problem before?

    2. Member
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      05-19-2017 02:15 PM #2
      My guess was going to be the diverter valve but if that's already been replaced then I'd be leaning towards a vacuum leak or boost leak in or around the intake or throttle body where he worked. All of the hoses clamps are good and tight?
      Last edited by ChelCC; 05-20-2017 at 12:35 PM.

    3. 05-19-2017 04:06 PM #3
      If you have a loud whistling noise coming from your 2.0t TSI engine you might have a bad PCV valve. A bad PCV can also cause Fault code 0171 System Too Lean, as well as others. Take a look HERE for more info on the TSI PCV issues. http://shopdap.com/common-problems-2-0t-tsi-engine/

    4. Member G60ING's Avatar
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      2010 3.6 4-Motion CC, 1990 G60/TDI/R36 Corrado
      05-19-2017 10:28 PM #4
      Boost leak, intake manifold gasket, vacuum line type of issue

    5. Member BOUDAH's Avatar
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      05-20-2017 09:55 AM #5
      Quote Originally Posted by G60ING View Post
      Boost leak, intake manifold gasket, vacuum line type of issue
      This, prob a vac leak or a gasket leak under load. I would have your mechanic diagnose it. The job should be warrantied


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    6. Semi-n00b
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      2013 VW CC Sport Plus
      05-20-2017 09:47 PM #6
      I asked the tech to check the hoses & clamps on the intake manifold and throttle body. He verified everything has been correctly reinstalled.

      I will take it back to him next week to recheck everything again. Thanks for the suggestions!
      Last edited by hobbes287; 05-20-2017 at 09:51 PM.

    7. Member G60ING's Avatar
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      2010 3.6 4-Motion CC, 1990 G60/TDI/R36 Corrado
      05-21-2017 09:10 AM #7
      Quote Originally Posted by hobbes287 View Post
      I asked the tech to check the hoses & clamps on the intake manifold and throttle body. He verified everything has been correctly reinstalled.

      I will take it back to him next week to recheck everything again. Thanks for the suggestions!
      Yeah these days mechanics aren't very good at trouble shooting something that doesn't have a code to tell them where to look. He should try using carb cleaner or starter fluid.

    8. 05-21-2017 09:42 AM #8
      The car should get a smoke test done, it'll show exactly where it's leaking.


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    9. Semi-n00b
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      2013 VW CC Sport Plus
      05-23-2017 01:38 AM #9
      Update. The mechanic said he already replaced the PCV unit. So far, he's replaced the diverter valve and PCV but the noise is still there. I'm starting to think it could be the high pressure fuel pump because the noise sounds a lot closer on my side than the passenger. I managed to record a short video of the sound while driving. If you listen carefully, you'll hear a whistle\chirping noise when I accelerate. The mic on my phone is sensitive and it picked up a lot of road noise as well. Sorry folks.

      https://1drv.ms/v/s!Agf4Mo5YS1exjjkbDJhK9_n1945s
      Last edited by hobbes287; 05-23-2017 at 09:35 AM.

    10. Semi-n00b
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      2013 VW CC Sport Plus
      05-31-2017 10:21 PM #10
      It's the turbo. VW mechanic finally called me and found the root cause. He recommended that I contact the dealer since it's part of the emission warranty (7 years or 70,000 miles).
      Last edited by hobbes287; 06-17-2017 at 02:14 AM.

    11. Semi-n00b
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      2013 VW CC Sport Plus
      06-17-2017 02:15 AM #11
      Just got the car back from the dealer today. The waste gate was malfunctioning. They replaced the turbo. Car is running fine now. Didn't cost me anything. It was part of the emission (pzev) warranty.

      FYI. Turbo diverter valve and PCV are also part of VW's pzev warranty.

    12. Member snobrdrdan's Avatar
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      06-17-2017 05:37 AM #12
      2017 Passat VR6
      2017 Passat R-Line

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