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Thread: TCC Lockup only by Hp Tuner

  1. #1
    Tuner in Training
    Join Date
    Apr 2019
    Posts
    14

    TCC Lockup only by Hp Tuner

    Have a 4L80E behind Duramax Diesel in 2006 Van, I can command Lockup on/off with HP Tuner but TCM 42 will not do it. Is there anything else besides brake switch that would prohibit lockup?

  2. #2
    Tuner in Training
    Join Date
    Apr 2019
    Posts
    14
    Does anyone know some parameters that TCM needs to let the TCC lockup. I have signal from ECU. Brake light switch. And Warm Temperature. My only other option is Quick4 Controller I guess?