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  1. #1
    Bobtail Member
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    Volvo 780 Instrument Cluster & Turbo problem

    i have an 05 Volvo 780 with Cummins ISX 475 hp. I have 2 problems with it at the moment.
    1. My instrument cluster/odometer stoped making sound of turn signals/low air alarm and just the beep beep noise for ready to start up. Basically there is no sound at all

    2. As i start up my truck with in the first 3 seconds Turbo makes a very strange noise of revving (RRRRUUUUMMMM) it last only bout a second or 2.
    I have already replaced the Acuator thats on the turbo. but i still get the noise.
    I dont have much problem while driving becuse i dont get the noise while driving at all on up hills or down hills. But it seems that my truck slows down lil faster if i let go of the accelerator. Idk if its the turbo or wat....



    Oh I also get the hiss noise as the gear gets shifted. could be air to air? Please help me out...
    I can record a small video clip and upload it so you can have a better idea...just let me know. thnx

  2. #2
    Road Train Member Pablo-UA's Avatar
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    about instrumental cluster.... beeper is located on back of board. Easy to acess romoving small torq screws back cover is held with. May be usuall problem of cracked solder. Easy to fix resoldering beeper. If wont working - bad small transistor used like amplifier. but before check truck for J1708/J1939 issues, especially LCM, becose instruments use data from LCM about blinker actuation, of course via CAN)))

  3. #3
    Bobtail Member
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    Hi Pablo-UA profesional!!

  4. #4
    Bobtail Member
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    are you here?

  5. #5
    Road Train Member Pablo-UA's Avatar
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    I'm here!) howdy 2 all!

  6. #6
    Bobtail Member kaly's Avatar
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    2006 volvo 670

    What are the noise signs of a turbo going out...i am getting a noise that sound like its sucking up air off and on..

  7. #7
    Road Train Member Pablo-UA's Avatar
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    VGT turbo?

  8. #8
    Bobtail Member kaly's Avatar
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    What is vgt turbO?

  9. #9
    Road Train Member Pablo-UA's Avatar
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    Variable Gemetry Turbo

  10. #10
    Bobtail Member kaly's Avatar
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    I find out is not the turbo that i thought ..looks like i have a exhaust manifold leak or air intake....i just bought that truck few weeks ago..i never had a volvo before so everything is new to me.