D12 losing power for a split second

Discussion in 'Volvo Forum' started by dorlia2, Jun 12, 2022.

  1. dorlia2

    dorlia2 Light Load Member

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    06 Volvo with D12 465hp
    Engine is losing power for a split second when loaded. Happens randomly and only when torque is needed. Diagnostics show everything in order, Fuel pressure, Turbo PSI
     
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  3. dorlia2

    dorlia2 Light Load Member

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    The only thing that seems out of order is ECU battery potential Goes up and down between 10 and 13.9 volts constantly, even when idling
    Battery charging and voltage is steady at 13.9v
     
  4. poniikyanion

    poniikyanion Light Load Member

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    You need to check the pair of small wires for the ecm that connect to the battery terminals for tightness. If they are loose you will lost engine power for a moment whenever you hit a bump on the road. I have a 05 and also used to have a 98 that would skip with the loose wires.
     
  5. dorlia2

    dorlia2 Light Load Member

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    Looks like potholes do not affect the problem, only higher torque demand does
    Wires look/test good
     
  6. Another Canadian driver

    Another Canadian driver Road Train Member

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    To get help you may need a better description than just 'losing power'.
    What happens with the RPM? Does it drops? By how much? How long?
    I suggest an instrumented loaded test with a PTT attached that will scan and catch it when it happens.
    I don't recommend a Volvo dealer unless you have no other option.
    The better service you can get from a private shop that works on Volvos like yours.
    Call them, give them your truck VIN, book a test and
    when it's fixed come back here and update the thread.
    As a courtesy and to help other owners with the same issue.
     
  7. dcc_BTT_Trucker

    dcc_BTT_Trucker Bobtail Member

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    My problem was the air filter. My empty trailer lot is a dirt parking lot. I have to wait for the dust to settle just to back up. RPMs would randomly drop and a smoke ring would come out of the stack.
     
  8. dorlia2

    dorlia2 Light Load Member

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    I am suspecting voltage drop for ECU. Vcads reading shows constant fluctuation between 10 and 13 volts at ECU battery potential. Alternator is good at constant 13.9v
     
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