So I have a 17 Sierra 6.2 that I added a flex fuel sensor to and had tuned on E85 a few years ago. Recently put an Edge Insight CTS3 and was told it will be able to read my ethanol percentage. Well I installed it and it does not have the pid for alcohol percentage. A friend of my has basically the same truck expect it was a factory flex fuel 5.3 and his Insight does have the alcohol percentage pid. My tune was looked over and is definitely set up right for the sensor. Does anyone know if since the truck was not factory flex fuel will it just not have the pid in the ecm even though a factory gm flex fuel sensor was added and correctly enabled in the ecm with hp tuners?