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06 S60 Clunk on acceleration S60

posted by  fireman_bob on  Sun Jan 24 09:27 CST 2010
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last visit: Fri Jan 24 11:32 CST 2014
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I went to look at an 06 S60 with 68k miles (AT, T version) today and all seemed well except for a quick "clunk" when accelerating from a dead stop. The sound felt as if it were coming from under the center console. It didn't feel like it was shift or transmission related as the power was smooth all the way to speed. I was also able to get it to happen when going in reverse, although not so bad. Also the car didn't seem to do it if I slowed down, but not to a stop, then hit the gas. The owner did admit that the car need tie rod ends, but I wouldn't think those would cause this type of noise. I have an 96 850 and I'm not that familiar with the S60 (yet).

Any ideas what this could be and the complexity of the repair?








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    06 S60 Clunk on acceleration S60

    posted by  KlausC on  Sun Jan 24 10:40 CST 2010
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    last visit: Fri Oct 24 10:15 CST 2014
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    It could be an engine mount, or a tranny computer problem.

    Klaus
    --
    Proud owner of a 220S. If I had more room, I would have more Volvos.








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      06 S60 Clunk on acceleration S60

      posted by  fireman_bob on  Sun Jan 24 11:50 CST 2010
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      Hi,
      How can I troubleshoot to find which it is? My thinking when I heard it was a motor mount too, but I had no way to check. Is there some test or visual check that can be done? If it's a tranny computer problem, that would imply (to me) a trip to the dealer, since my OBDII reading can't read transmission codes. Also, I only noticed this when the engine was hot, after driving for about 20 minutes. It didn't do it right after a cold start.







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        06 S60 Clunk on acceleration S60

        posted by  KlausC on  Sun Jan 24 15:48 CST 2010
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        last visit: Fri Oct 24 10:15 CST 2014
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        A mount would have caused a clunk while cold. Just watching the engine while someone else shifts will show a lot of movement.

        Check the tranny fluid for redness. A scanner can pick up most tranny codes, but not if the transmission code is at fault. That requires a dealer download, about $100. There have been known problems in earlier models with the tranny releasing the torque converter, or not releasing, while the car is stopped.

        If you buy this car I suggest the first thing on the list is a tranny flush.

        Klaus
        --
        Proud owner of a 220S. If I had more room, I would have more Volvos.








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          06 S60 Clunk on acceleration S60

          posted by  fireman_bob on  Mon Jan 25 01:15 CST 2010
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          last visit: Fri Jan 24 11:32 CST 2014
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          I did check the fluid as part of my inspection. It looked clear and red with no burnt smell. It appeared normal.
          The torque converter issue you mention may be the problem, since as you say, the engine mounts would cause the noise all the time, not just when hot.
          If it is the torque converter:
          1) Is this error something that would show up on a code reader (is there a code for this and could the computer detect it)? If so, wouldn't the CE light come on? I know in my 850, when the transmission computer throws a code, it lights the CE. (I found an easy fix to disable writing of the tranny data so anyone with a regular reader can reset the CE light from a tranny code. Let me know if you would like this info).
          2)How big of a job is it to repair? Would it involve a new tranny?
          Thanks again for all of your help. It's great to have you as an expert resource.
          Bob







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            06 S60 Clunk on acceleration S60

            posted by  KlausC on  Mon Jan 25 04:44 CST 2010
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            last visit: Fri Oct 24 10:15 CST 2014
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            Very few tranny error codes light up a CEL, they must be severe to do so. There is a special code the TCU sends to the ECU, because the ECU is in charge of the CEL. Most tranny codes can be erased with a generic scanner, including the one that sets the CEL.
            It is the TCU that causes the upshift arrow to blink.

            No codes will be initiated if there is a programming fault. If there are any maintenance records, check for transmission code updates. Because there are few 06 models on the board, you could call the dealer service reps and ask if there are any TCU updates for 06. Just remember, the dealer charges for updates.

            I am hardly an 'expert'. It is just that I read all of the posts and remember most of them. I only write what others have already expained. But, thanks anyway.

            Klaus
            --
            Proud owner of a 220S. If I had more room, I would have more Volvos.







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