code. spn 656 fmi 7 cummins

Discussion in 'Volvo Forum' started by Roman78, Nov 6, 2021.

  1. Roman78

    Roman78 Light Load Member

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    May 20, 2021
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    Check engine light on with cod
    spn 656 fmi 7 cummins
    also im getting bad mpg
     
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  3. Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    I get the same code, it comes and goes. I think there called ghost codes. My mileage sucks to, the best I’ve ever gotten out of my isx 15 is 6.8 and was running lite. When I’m heavy, 5.5. 5750E0F8-8183-46A1-B6F6-5F9E06F5E985.jpeg
     
  4. Roman78

    Roman78 Light Load Member

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    May 20, 2021
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    Is it safe to drive on t. Will fuel injector cleaning help. Thanks alot
     
  5. Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    It’s safe to drive. I’ve used a diesel supplement for maintenance. CCD35220-972D-4A6C-BA9D-A4A9E981B028.jpeg
     
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