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Thread: P2121 code APPS issues

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    Basic Member Joseph S.'s Avatar

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    P2121 code APPS issues

    So my 2007 Cummins has been acting up lately. I get a code p2121. I get weird throttle response and goofy shifting. The code reads accelerator pedal position sensor. Anyone had this issue? Tips or tricks? Things to look for or check? I can clear the code and it will be ok for a little while then act up again. I checked my grounds, cleaned them up. Replaced a worn battery cable end. Did an apps relearn. Cleared the code and it still comes back. Thanks in advance for any help.


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    JOKER! F350Cummins's Avatar

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    Re: P2121 code APPS issues

    my first thought is a tps. is this an 07 with a 5.9 or a 6.7? remove any tuner and try after a reset.

    P2121-pedal Position Sensor 1 Conformance Error
    P2121 Pedal Position Sensor 1 Performance / Rationality

    other notes:
    It is important to initialise the throttle sensor after replacing it.koeo push the throttle pedal to the floor slowly & back up Done.
    But this sounds like something more serious. He needs to check the wiring between the tps/apps & the ecm, if wiring is ok chances are he needs an ecm.If there is a chip in this veh try removing it

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    HKBIGDADDYDIESELDAN's Avatar

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    Re: P2121 code APPS issues

    It sounds like to me that your APPS has gone bad or is possibly going bad on the older Gens they are known to wear out and cause problems How many miles do you have ?

    2012 Cummins Ram 6.7L MM3 tuner full 5" Flo Pro TBE Exhaust LWBCC 4x4 Mag Hytec Double Deep Transmission Pan , Mag Hytec Rear Diff Cover
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    Old & Grumpy! Polaraco's Avatar

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    Re: P2121 code APPS issues

    Quote Originally Posted by HKBIGDADDYDIESELDAN View Post
    It sounds like to me that your APPS has gone bad or is possibly going bad on the older Gens they are known to wear out and cause problems How many miles do you have ?
    I agree. It's a common failure. The parameters from it talk to allot of operations. Not just the throttle control. Those things aren't cheap. Try finding a used one


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    Basic Member Johnny Rivera's Avatar

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    Re: P2121 code APPS issues

    I’ve changed the tps, throttle body delete and still experiencing problems once a month. Frustrating.


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