Blinking DEF

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mr Bob, Aug 4, 2020.

  1. Mr Bob

    Mr Bob Light Load Member

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    Mar 17, 2015
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    I have a ( dont laugh ) Isuzu 5.2 with a blinking DEF light full tank of DEF and DEF gauge reads full. EXH SYSTEM in red on the message board and the derate icon is on but it dosent seem to be derated when I drive it. Cant do a forced regen. Also have a P02C9 code. I also get a P1034 NOX code.
     
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  3. buddyd157

    buddyd157 Road Train Member

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    maybe the DEF sensor is gummed up or something. what i have found over the years, is that one sensor not working sets off another code or 2.

    i have read somewhere, that cheap DEF fluid can be the cause of this?
     
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