2008 Silverado (E38) (T42) 6.0ltr/4L70E (L76) OS-12617631-
I disabled my AFM so I could check my MPG without the help of AFM and I saw what I needed, I re-flashed the ECM to enable AFM and it won't work even with a full Flash....Do I need a different(new) ECM? Any Ideas?
Maybe there's a AFM fuse?
I've tried disconnecting the battery and re-flashing like 5 times(2 Full Flashes)