2003 Mack cl problems

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Thetrashnoob, Jun 22, 2021.

  1. Thetrashnoob

    Thetrashnoob Light Load Member

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    May 30, 2019
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    2003 cl 713

    Picked the truck up from the shop, they fixed some wiring and lighting issues, and repaired some wiring on the trans for the reverse lights…

    The Speedometer just decided that it wanted to stop working on the drive home , I’m assuming that’s a sensor hopefully something simple.
    the next issue is truck feels like it’s not building boost. Can have the pedal all the way to the floor and the truck just don’t pull.
    So started looking into it and seems like it could be the speed sensor, I’m wondering if they damaged it when they were repairing the wiring. I’ve called the shop but haven’t heard back.
     
    Last edited: Jun 22, 2021
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    Bad speed signal to the ECM can derate a lot of engines. Likely related to something they did but stuff happens.
     
    spsauerland Thanks this.
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