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?
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?
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?