Multiple Issues With New To Me 18' Street Triple 765 R P2120/tc Light & Limp Mode

Discussion in 'Technical Help' started by Jcasteelo, Sep 25, 2025 at 10:21 PM.

  1. Jcasteelo

    Jcasteelo New Member

    Thursday
    0
    1
    united states
    Hello All,

    i purchased a 2018 street triple 765 r a couple months ago and a i have some issues going on, new to the platform coming from a 2015 yamaha fz07...

    Bike has 68xx miles, one day i rode to the gym and after my workout i turned the bike on and it throws a CEL and the TC was disabled. Rode it home and it felt like it went into limp mode, bike has P2120 code.

    I plugged it into the tender for awhile and did 3 start up cycles and it went away, until one day only the CEL came back on with the same code but no TC light.

    After that happened i checked on tuneecu if the throttle grip sensor was functioning and it seemed like it was, and the TPS seemed to be working too. connections and wires looked good, i did a hard reset by removing the battery for some time and eventually rode it to the gas station on normal mode and didn't feel like it was on limp mode so again, i thought it's fine.

    Next day, i was gonna go for a ride and decided to switch to rider mode and it throws a CEL along with the TC light, so i tried to go to sport mode and its just blinking and hasn't changed and it's back on limp mode.

    I love my street triple and i havent even put 1k miles on it and i just want it functioning again!!! Any input is greatly appreciated!
     
    • Useful Useful x 1
  2. joe mc donald

    Subscriber

    Dec 26, 2014
    15,352
    1,000
    slough / burnham
    @Jcasteelo Welcome to the family. Must be annoying having this keep occurring. Perhaps you need to talk to a good dealer and possible remap. Some of the wise ones will be here soon as they know lots more than i.
     
  3. Jcasteelo

    Jcasteelo New Member

    Thursday
    0
    1
    united states
    i've been trying to do my due diligence to learn about the bike so i can work on it myself, but it's looking like i might have to eventually. I was thinking it might be the battery since it looks like the factory one. but we'll see i might eventually just have to bring it to the dealership for diagnosis.
     
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  4. Bolosun

    Bolosun Noble Member

    Aug 25, 2020
    311
    313
    Crewe/Cheshire
    Check wiring connections, especially to the battery. How old is the battery?
     
    • Agree Agree x 2
  5. CraigHew

    CraigHew Member

    Jul 25, 2021
    78
    18
    Whitchurch, Shropshire
    Check battery is earthing correctly by cleaning up earth point tightening cables etc.
     
    • Agree Agree x 1
    • Love You Love You x 1
  6. RickM46

    RickM46 Active Member

    Oct 12, 2023
    72
    28
    US
    Let us know what you find.
     
  7. Jcasteelo

    Jcasteelo New Member

    Thursday
    0
    1
    united states
    all connections and wiring seem fine, It seems like an older battery it was the one i got the bike with. I have a battery being delivered today... i hope it solves my issues cause I dont think this bike would have these issues with less than 7k miles
     
  8. Jcasteelo

    Jcasteelo New Member

    Thursday
    0
    1
    united states
    replacing the battery today once it's delivered, thank you!
     
  9. Jcasteelo

    Jcasteelo New Member

    Thursday
    0
    1
    united states
    yes sir, i'll keep you posted!
     
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