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No Boost with JB4

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  • No Boost with JB4

    Just installed my JB4 on a 2019 Genesis G70 and I am getting absolutely no boost since install as well as a P0238 almost every single time I start the car. I clear the code and restart and it goes away but I still get no boost. I have confirmed correct attachment of both the connectors and the 2 x O2 sensor connectors.

    If I disconnect the JB4 from the car, everything is back to normal with boost.

    What am I possibly missing?

    Thanks for any help.
    Attached Files

  • #2
    You must have the connections in the wrong spot. Send a picture of the engine bay with the jb4 connect. Theirs tons of install videos on YouTube.
    Attached Files


    • #3
      Thank you for the help. After taking pictures I was about to upload them when I caught the issue. The yellow wire on the rainbow connector had come out of the connector. Not all the way but enough that it wasn't making contact. I suspect it was vibrating in and out which was causing the P0238.

      Good to go now and man I just have to say it's like having a new car.


      • #4
        Glad it was an easy fix!
        Burger Motorsports
        Home of the JB4 the worlds most popular turbocharged tuning system!

        It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.