I wanted this so I can add hold mode to my 2012 Chevy Volt using the phone app. Now I can set hold mode on my machine. I also wanted to use the Mygreenvolt app to see the parameters that the car doesn't show and I used it to reset my life mileage on the display with another app. I keep it on all the time with no problems, even after a week of using the machine with no problems. I can also just take it off, stick it in a friend's car and read the error codes if I want.
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