Maxxforce derate says scr error but the laptop isn’t showing anything wrong

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Maxxforce mess, Nov 29, 2023.

  1. Maxxforce mess

    Maxxforce mess Bobtail Member

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    Nov 29, 2023
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    I have an International Lt with a Maxxforce engine. It set a code of 5246. Scr error. Changed bad Nox sensor. Done several forced regens but the derate & Scr error code still on. The mechanic has run every test in the book. Everything seems to be working properly but the Scr error still shows up… Why?
     
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  3. JB7

    JB7 Medium Load Member

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    Dec 13, 2022
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    Are you saying that the mechanic cleared the code and it comes back? Or that he was not able to clear the code? Or did the mechanic expect the code to go away by itself after the sensor was replaced? Try disconnecting the battery for 5 or 10 minutes, reconnect, start the engine and see what happens. If you still can't get rid of the code the next step would be to have the ECM updated.
     
  4. Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    That code is for SCR driver inducement, meaning you drove too long with an active fault. Those codes cannot be cleared with generic software. You need to see someone with Navistar Engine Diagnostics to reset the SCR fault reset request parameter.
     
    JB7 Thanks this.
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