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Thread: C121C DTC After Cam Swap

  1. #1
    Tuner in Training
    Join Date
    Apr 2022
    Posts
    10

    C121C DTC After Cam Swap

    Anyone dealt with a DTC C121C torque request denied ??

    I did a mild Comp Cams Stage 1 cam (201-300-17) with lockout on a 2010 Dodge Ram 5.7 2WD.
    MDS delete- non MDS lifters and solenoid plugs - runs pretty good until my Traction Control light comes on.

    The truck came in my shop with a blown motor so I dont know if it was an existing issue or not.

    Book says causes are

    EXCESSIVE LOAD ON ENGINE
    TRACTION CONTROL OPERATING FOR TOO LONG
    ANTI-LOCK BRAKE MODULE
    POWERTRAIN CONTROL MODULE

    I did an 2009 RAM 5.7 not tool long ago and did not have this problem, only difference it was a 4 WD

    I swapped ABS module - no change.

  2. #2
    Tuner in Training
    Join Date
    Apr 2020
    Location
    Phoenix, AZ
    Posts
    10
    Same issue here. Did you figure it out?

  3. #3
    Banned
    Join Date
    Jan 2022
    Location
    fountain valley
    Posts
    2,379
    What happens when your traction control light comes on?

    Post the stock read and the current tune

  4. #4
    Potential Tuner
    Join Date
    May 2024
    Location
    Alabama
    Posts
    1
    I was just having this same code c121c set after cam install and pcm replacement for me the fix ended up being timing i had it off 1 tooth re timed engine and runs great now hope this help's