P121B OBD Error code

Discussion in 'SRT Hellcat Maintenance' started by Digger, Jun 16, 2015.

  1. Digger

    Digger Hellcat Member

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    FYI...my 2015 HC Challenger with 300 miles is throwing a P121B code in diagnostics screen. Took it to dealer and it is and active exhaust sensor module which needs to be replaced. Incase anyone else is experiencing this issue. Did not notice any difference in performance, but still babying the car due to break in period.
     
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  2. Snappycat

    Snappycat SRT Hellcat Moderator Staff Member

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    Dig...sorry to hear that. B5 are you out there and are you tracking these sorts of things?
     
  3. Paladin06

    Paladin06 Have Guns Will Travel Staff Member Hellcat Car Club Gold Supporting Member

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    Just had a member report a master cylinder failure this morning.
     
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  4. Needforspeed

    Needforspeed Hellcat Member

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    Major issue with PCM flash on cars built prior to March of 2014. My car is number 555 built 11/10/14. Flash was done on Friday and now have issues with SC not delivering boost at low to mid RPM. Notified SRT and car will stay at dealer until issue is resolved. I would decline PCM flash until issue is resolved.
     
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  5. B5 Blue

    B5 Blue Platinum Member

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    Not officially but I do log them in my notes if you tag me, I just stumbled across this
     
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  6. TallCool1

    TallCool1 Gold Member Hellcat Car Club Gold Supporting Member Nat'l Hellcat Tech Advisor HCC Charter Member

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    ???

    Specifically what flash (list which one.)
    Built before March 2014? Pls list last 8 vin. (2014?)

    My car (built Dec last year) was current as of last week (all tsb.) It doesn't exibit what you describe.
     
  7. Needforspeed

    Needforspeed Hellcat Member

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    Flash 18-016-15 (PCM) and 21-009-15 (TCM) vin713771. Built November of 2014.
     
  8. Paladin06

    Paladin06 Have Guns Will Travel Staff Member Hellcat Car Club Gold Supporting Member

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    Have not heard of either of these. My car was built 17 Nov 2014 - VIN 714177.
     
  9. FreightTrain

    FreightTrain Comfortably Numb

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    manuals, automatics or both?
     
  10. B5 Blue

    B5 Blue Platinum Member

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    Me neither
     
  11. Needforspeed

    Needforspeed Hellcat Member

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    If u bring your car in for oil change the dealer should have notified u of the PCM and TCM flash along with radiator clamp and fuel line.
     
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  12. Needforspeed

    Needforspeed Hellcat Member

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    The updates are associated with vin number on car
     
  13. TallCool1

    TallCool1 Gold Member Hellcat Car Club Gold Supporting Member Nat'l Hellcat Tech Advisor HCC Charter Member

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    Both are listed in the service bulletin wiki (make sure you expand to see all...)
     
  14. TallCool1

    TallCool1 Gold Member Hellcat Car Club Gold Supporting Member Nat'l Hellcat Tech Advisor HCC Charter Member

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    see service bulletin wiki (expand to see all...) use the #s the posted above and cross to each TSB that way
     
  15. B5 Blue

    B5 Blue Platinum Member

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    I didn't see that button to click to expand. Told you I not always correct;)thank you
     
    Last edited: Jun 17, 2015
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