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Discussion Starter · #1 ·
Hello, everyone! I have a VW T-Roc 1.0 115 HP TSI, bought brand new last year. After about 3000 km or less, I started to hear a strange noise like a whistle or a squeak when I pressed the gas pedal. It hasn't gone off since. It can last from one second to 3-4 seconds and it's intermittent. There are days when I don't hear it at all and days when I hear it quite often. I hear it at different speeds and no matter the gear I'm in. Any idea what may cause it? Does anyone else have this problem? It is quite annoying the more so as it's in a brand-new car. Thanks!
 

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Hi Florin. I have an MY20 T-Roc with the same 1.0 115 TSI engine and it too makes the same whistling noise exactly as you descibed. Some days it happens often, and other days not at all, and it has done this from new. Today I made two journeys of about 30 miles each and it whistled on the outward journey and not at all during the return. It seems to happen most on a light throttle and disappears when I either press on the gas slightly, or lift off a little. I'm not sure if it is an actual ' fault ', because my previous car, a Golf mkVI 1.4 TSI also made this intermittent whistle, and I had that car for ten years from new with no problems, but I agree that it is annoying.
I could be a resonance that sounds like a whistle coming from the turbo, or the alternator. But it sounds more like the relief of a vaccuum, or pressure ......... in short I've no idea as to the cause, but it would be great to get rid of it, although I've learned to live with it now so I haven't made a lot of effort to trace the cause.
There must be other 1.0 T-Roc owners on the forum who have experienced this whistle, so it would be good to have input from them, and perhaps collectively we can figure this out. If anyone finds a cure, a post of your findings/actions would be much appreciated.
 

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Have neither of you raised this with the workshop ?

Several possibilities come to mind;

  • A slipping drive belt
  • Turbo whine (not likely on light throttle)
  • Turbo actuator (vacuum operated)
 

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Discussion Starter · #5 ·
Hello, Rocadoodledo! So that makes two of us… Interesting how you keep bumping into the same issue in two different cars albeit produced by the same manufacturer. Regarding the post you linked, I don't know if the Polo's engine's layout is the same as the T-Roc's. I already looked at mine and couldn't locate the "hard ribbed plastic pipe" RUM4MO was talking about but I'm going to take a picture of my engine and post it here, maybe you can identify it.
 

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Hi Florin. I have an MY20 T-Roc with the same 1.0 115 TSI engine and it too makes the same whistling noise exactly as you descibed. Some days it happens often, and other days not at all, and it has done this from new. Today I made two journeys of about 30 miles each and it whistled on the outward journey and not at all during the return. It seems to happen most on a light throttle and disappears when I either press on the gas slightly, or lift off a little. I'm not sure if it is an actual ' fault ', because my previous car, a Golf mkVI 1.4 TSI also made this intermittent whistle, and I had that car for ten years from new with no problems, but I agree that it is annoying.
I could be a resonance that sounds like a whistle coming from the turbo, or the alternator. But it sounds more like the relief of a vaccuum, or pressure ......... in short I've no idea as to the cause, but it would be great to get rid of it, although I've learned to live with it now so I haven't made a lot of effort to trace the cause.
There must be other 1.0 T-Roc owners on the forum who have experienced this whistle, so it would be good to have input from them, and perhaps collectively we can figure this out. If anyone finds a cure, a post of your findings/actions would be much appreciated.
 

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In my previous post on this fault I encountered the exact same problem. Eventually took it to Volkswagen dealer for a service and asked them to investigate. They came back with the standard 'natural characteristic of the vehicle' excuse! I don't believe they even looked at the problem. Back at square one I'm afraid! Driving me nuts.
 
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