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DEF Light FLashing 10 Codes Paccar

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Proxy, Mar 20, 2019.

  1. Mar 20, 2019 #1
    Proxy

    Proxy Light Load Member

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    Sep 3, 2018
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    The truck has been perfect until today. Driver said the truck was low on DEF and went truck stop to add some and went into full derate the second he started it with no prior warnings. after starting the truck 10 Codes came on at once including flashing DEF light. Does it look like maybe it was completely ran out of DEF? I included a screenshot of the codes, what do you guys think?

    2016 T680 400k+

    Truck Codes.PNG
     
    Proxy, Mar 20, 2019
    Proxy, Mar 20, 2019
    #1
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  3. Mar 20, 2019 #2
    Goodysnap

    Goodysnap Road Train Member

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    The unit was not low on DEF. With an Emissions fault the DEF light on the gauge will come on or flash even with a full tank. Get in the shop to troubleshoot the SCR faults at hand.

    Suspect wiring issue or defective SCR temp / outlet NOx sensor.
     
    Goodysnap, Mar 20, 2019
    Goodysnap, Mar 20, 2019
    #2
    spsauerland Thanks this.
  4. Mar 20, 2019 #3
    Proxy

    Proxy Light Load Member

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    thanks for the reply! will post update after I get it in and checked out
     
    Proxy, Mar 20, 2019
    Proxy, Mar 20, 2019
    #3
    Goodysnap Thanks this.
  5. Jun 7, 2019 #4
    TruckerChance

    TruckerChance Bobtail Member

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    Nov 30, 2018
    Baltimore MD
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    Any updates?
    I’m having the same issue with my 2013 t700
    Mx13
     
    TruckerChance, Jun 7, 2019
    TruckerChance, Jun 7, 2019
    #4
  7. Jun 9, 2019 #5
    Proxy

    Proxy Light Load Member

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    Sep 3, 2018
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    I responded other night from my phone not sure why it didn't stick stay...

    long story short, the driver definitely ran it out of DEF as he pulled into station to fill so it went into derate. Thing is it wouldn't come out after he filled the tank (despite what ive read) had it towed to the dealership they claimed there was a "loose wire" at a specific connector... coincidence? possibly but you know how those things go.... no issues since
     
    Proxy, Jun 9, 2019
    Proxy, Jun 9, 2019
    #5
    TruckerChance Thanks this.
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