I dont know what the brake light reading is referring to because the actual brake light comes on and off when looking at the dash just fine when I use the parking brake. And it doesnt seem to affect the transmission moving between gears or anything else as I assume it would if it were malfunctioning. I will try and do some research to see what that actually means when the scanner shows "brake switch on"Wait.. just had another look at the pdf. Brake switch on? Not sure about that ECM, but that can cause all kinds of voodoo with OBD2.