grinding noise then high tach

Discussion in 'Freightliner Forum' started by mpbest, Oct 4, 2012.

  1. mpbest

    mpbest Bobtail Member

    7
    0
    Oct 4, 2012
    0
    We have a 2004 Freightliner Columbia Detroit 60 series super 10. When hooked up to the computer it shows invalid multiple codes. Just replaced the batteries and a transmission fuse. It starts with a short grinding noise like your are downshifting, then it tacks high. It does it with and without the cruise control. They have tried swapping out several parts, but nothing seems to work. The mechanic thinks it may be the ECm or wire harness. Has anyone had this problem or have a suggestion as to what it could be?
     
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  3. FCW9

    FCW9 Light Load Member

    114
    46
    Jun 12, 2012
    Baldwisnville, NY
    0
    If it's a grinding noise, that sounds trans related, have them check the TCM (trans control module), not the ECM (engine control module). There might be something going on with the starter. I had an old international pickup that when she got hot the starter solenoid would trip and grind the stuffing out of the bendix. That load would eventually heat the clutch up and "let the slipping games begin."

    good luck.
     
  4. mpbest

    mpbest Bobtail Member

    7
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    Oct 4, 2012
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    Thanks, I will mention it to the mechanic this morning. The grinding noise does not last very long. The truck has 980,000 miles and I can't begin to list everything we have replaced and were hoping to have the engine rebuilt over Christmas, but we are beginning very frustrated at this latest development.
     
  5. allons18wlr

    allons18wlr Bobtail Member

    16
    2
    Oct 20, 2012
    fay, nc
    0
    Did u ever figure out the problem? Mine acted the same and was the power divider in diff!
     
  6. mpbest

    mpbest Bobtail Member

    7
    0
    Oct 4, 2012
    0
    They ended up replacing the ECM and found a couple of wires that were frayed.
     
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