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  1. #1
    Bobtail Member
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    What is Fault Code 12? Peterbilt c-15 CAT

    2005 peterbilt c-15 cat...getting a fault code 12....wat is a fault code 12?

  2. #2
    Light Load Member Sparkz's Avatar
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    I think it is a fault with the coolant level sensor.

  3. #3
    Bobtail Member
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    coolant level fault

  4. #4
    Light Load Member
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    That is common with Pete's, usually from moisture. You can get the coolant level set at default in the ECM, but unhook the sensor and just monitor the level yourself.