2016 Cascadia/Detroit completely shuts off while driving.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by jammer910Z, Mar 16, 2019.

  1. Scoot 1971

    Scoot 1971 Light Load Member

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  3. Scoot 1971

    Scoot 1971 Light Load Member

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  5. Bains

    Bains Bobtail Member

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    Sep 20, 2018
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    Had same problem with 2015 cascadia . Randomly shuts down for 2-3 seconds on the road . Changed PNDB(CAD$650) for part . Changed myself . Problem solved .

    Today on another truck 2014 cascadia . Tried to turn on the power from main power switch . But no beeps, no lights on dash . Just a small red light blinking on switch knob .
    Diagnosed and found 25amp dead fuse in PNDB . Had to get it from dealer tomorrow :/
     
  6. trucker4life_

    trucker4life_ Bobtail Member

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    Mar 18, 2021
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    FYI: if any time you notice the voltage gauge shows > 14.2 volts that indicates the 5A fuse of the PNDB is busted. This fuse is to keep the voltage from the alternator to PNDB at 14.2 or less. There is a relay in the PNDB that cannot handle more than 14.2v. If the 5A fuse is busted the voltage from the alternator passing through the PNDB will get higher than 14.2v sometimes it gets 14.8v in my case and it will cause the relay eventually wearing out and it will cause loss of power while driving and you’ll have to replace the whole PNDB box which costs about $405+tax. But it’s so easy to prevent this by replacing the 5A fuse any time you see truck’s voltage more than 14.2v. There are 2latches holding the door, snap those off, take out the door and you’ll see 4 fuses, the brown top one is the 5A fuse and if it’s busted, replace it and you’ll seethe voltage drops back to 14.0 or 14.1v.
     
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