Freightliner chk eng code Dlp051

Discussion in 'Trucks [ Eighteen Wheelers ]' started by pickle, Jan 12, 2011.

  1. pickle

    pickle Bobtail Member

    2
    1
    Jan 12, 2011
    Bowling Green, KY
    0
    2010 Freightliner Columbia with Mercedes-benz engine runs rough about every 400 miles. Clears up after 75-90 miles. Chk eng lt comes on sometimes with code ECU 128 - Dlp 051 - Fail 02. Local dealer backed up until middle of next week!!!! Anyone know what this code is?
     
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  3. Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    may be MID 128 PID 051 FMI02? Throttle position circuit failed.....
     
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  4. pickle

    pickle Bobtail Member

    2
    1
    Jan 12, 2011
    Bowling Green, KY
    0
    Turns out you are right.....sort of. It was the code for the throttle position sensor, but that was not the problem. Finally got truck into a dealer and they were able to determine the TPS sensor was faulting due to a throttle intake valve that was not opening/closing correctly. After replacing the valve and the CAC hose, the code cleared and everything was OK. Took less than 4 hours to diagnose and repair.

    FYI I am seeing much better fuel mileage now and the engine seems to have more power at higher speeds. If this happens to anyone else I would definitely recommend getting into a dealer or GOOD service shop soon. You can continue to drive with this condition for 4-5K miles, but it will only get worse. This is not a check engine light to ignore.
     
    Injun Thanks this.
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