DEF led blinking. At 25% Derate.

Discussion in 'Questions From New Drivers' started by VIDEODROME, May 22, 2017.

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  1. May 23, 2017 #11
    VIDEODROME

    VIDEODROME Road Train Member

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    The shop said 'After Treatment' was very poor or low efficiency. Yet there wasn't buildup in the DEF tank and testing the DEF fluid didn't show anything. Afterwards, they did a Regen and the faults started to clear. Then just to be sure, they did another partial Regen.

    Truck is Fixed, but wish a more definitive reason for the Derate problem was revealed. Possibly it was related the the DEF I bought at that fuel stop. I dunno.
     
    VIDEODROME, May 23, 2017
    VIDEODROME, May 23, 2017
    #11
    Oldironfan Thanks this.
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  3. May 23, 2017 #12
    ogre1977

    ogre1977 Bobtail Member

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    Could be a bad wiring harness for one of the components of the DEF system. Had that happen a few times.

    The first time an injector had dripped DEF all over the wiring connector and corroded it. Another time the insulation of a wire had rubbed off, causing a short for the DEF pump.
     
    ogre1977, May 23, 2017
    ogre1977, May 23, 2017
    #12
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  4. May 24, 2017 #13
    VIDEODROME

    VIDEODROME Road Train Member

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    Figures first thing after truck is fixed I go sit at one of the slowest customers. Waited hours for a dock, now waiting for the lumpers.
     
    VIDEODROME, May 24, 2017
    VIDEODROME, May 24, 2017
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  5. May 24, 2017 #14
    longbedGTs

    longbedGTs Heavy Load Member

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    I dealt with a similar problem on a Cascadia. It was determined that the nox sensors were bad. They were apparently sending a faulty reading to the computer, which in turn thought there was a problem with the DEF system. Big mess of nonsense IMO, but I don't know if the n0x sensors fixed the problem since I never got back into that pos truck again.
     
    longbedGTs, May 24, 2017
    longbedGTs, May 24, 2017
    #14
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  7. Jun 9, 2017 #15
    VIDEODROME

    VIDEODROME Road Train Member

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    Truck ran fine for a while, until I did another heavy load in Pennsylvania hills.
    Didn't wait for it to Derate. Did a Regen and check engine light and DEF warning light went off. A yellow engine light not labeled stayed on. Delivered then did a long deadhead to pickup a lite load in New York. During that trip, the plain yellow light next to the check engine light went off.

    During all this, I didn't see a DPF light come on.
     
    VIDEODROME, Jun 9, 2017
    VIDEODROME, Jun 9, 2017
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  8. Jun 9, 2017 #16
    uncleal13

    uncleal13 Road Train Member

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    What year and how many miles on the truck?
     
    uncleal13, Jun 9, 2017
    uncleal13, Jun 9, 2017
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  9. Jun 10, 2017 #17
    reverendhandy

    reverendhandy Medium Load Member

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    Went through the same scenario a few years ago.
    Replaced sensors, did regens, had filters cleaned not once but twice.
    Everything OK for a while. Coming through Janesville, WI, both engine lights came on, started derating the engine. Went straight to shop.
    Tested engine per guidelines of Cummins.
    Cleaned filers, tried again.
    Replaced sensors, tried again.
    Wouldn't pass test.
    They sent all reports to Cummins.
    Particulate filter had complete failure.
    Had to order new one.
    3 weeks in a hotel, 7200+ later in repairs, mostay under warranty, truck ran like it was brand new.
     
    reverendhandy, Jun 10, 2017
    reverendhandy, Jun 10, 2017
    #17
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  10. Jun 11, 2017 #18
    VIDEODROME

    VIDEODROME Road Train Member

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    I'm back my home terminal wondering if I should suggest switching trucks if this is a long repair.

    Also, neither the air conditioning or APU work.
     
    VIDEODROME, Jun 11, 2017
    VIDEODROME, Jun 11, 2017
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  11. Jun 11, 2017 #19
    77fib77

    77fib77 Road Train Member

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    Lol. Um no ac? It was 90 just south of Chicago yesterday.
     
    77fib77, Jun 11, 2017
    77fib77, Jun 11, 2017
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  12. Jun 11, 2017 #20
    VIDEODROME

    VIDEODROME Road Train Member

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    Yeah it sucks. Most nights have been cool enough to sleep, but it's been warming up.

    They've been doing a half-assed repair attempt just recharging it, then it just leaks out.
     
    VIDEODROME, Jun 11, 2017
    VIDEODROME, Jun 11, 2017
    #20
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