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Thread: P2121 Code

  1. Top Of Page | #11
    Basic Member Johnny Rivera's Avatar

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    Re: P2121 Code

    Would you think it would be the throttle position sensor on the CP3 pump?


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  2. Top Of Page | #12
    Basic Member Johnny Rivera's Avatar

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    Re: P2121 Code

    Correction on the last post. Fuel injection sensor on the CP Pump.


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  3. Top Of Page | #13
    Basic Member Johnny Rivera's Avatar

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    Re: P2121 Code

    Got a tip from a buddy of mine the other day that he had the same problem with his truck. He told me that he changed the fuel pressure regulator and it fixed the problem with this P2121 Dead Pedal problem. Just changed it out today, so we’ll see soon if this fixes the problem with my truck. I’ll keep y’all posted soon.


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  5. Top Of Page | #14
    Permanent Vacation RamHunter18's Avatar

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    Re: P2121 Code

    Fingers crossed


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  7. Top Of Page | #15
    Basic Member Tucker0074's Avatar

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    Re: P2121 Code

    Did it work? I also have this issue and I’m about annoyed with it


  8. Top Of Page | #16
    Basic Member Johnny Rivera's Avatar

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    Re: P2121 Code

    Quote Originally Posted by Tucker0074 View Post
    Did it work? I also have this issue and I’m about annoyed with it
    Found out that the previous owner tried to change the pedal accidentally pulled some of the wires out of the pigtail that plugs into the pedal assembly. Once I pushed the wires back in it’s been running good since.


    No Matter Where You
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    2012 Dodge Dually|3500 HD|MiniMax|Already Deleted|1st Diesel


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  10. Top Of Page | #17
    Basic Member Tucker0074's Avatar

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    Re: P2121 Code

    I’ll have to check mine. I know the clips for the pig tail are broke and have been since I owned it. I wrapped electrical tape around it to keep it plugged in. Could still be moving though


  11. Top Of Page | #18
    Basic Member Johnny Rivera's Avatar

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    Re: P2121 Code

    Quote Originally Posted by Tucker0074 View Post
    I’ll have to check mine. I know the clips for the pig tail are broke and have been since I owned it. I wrapped electrical tape around it to keep it plugged in. Could still be moving though
    Another thing I found was a wire from that same bunch was grounding out on the steering column.


    No Matter Where You
    There You Are
    2012 Dodge Dually|3500 HD|MiniMax|Already Deleted|1st Diesel


  12. Top Of Page | #19
    Basic Member Tucker0074's Avatar

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    Re: P2121 Code

    I’ve always thought mine was a ground issue. I’ll try something. The code won’t come back for weeks and then one day it’ll come back


  13. Top Of Page | #20
    Basic Member Johnny Rivera's Avatar

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    Re: P2121 Code

    Quote Originally Posted by Tucker0074 View Post
    I’ve always thought mine was a ground issue. I’ll try something. The code won’t come back for weeks and then one day it’ll come back
    Drove me crazy too!!!! I was ready to trade in my truck, but I barely bought it in December. Would’ve been really upside down!!!!


    No Matter Where You
    There You Are
    2012 Dodge Dually|3500 HD|MiniMax|Already Deleted|1st Diesel


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