My truck would just shut off. No check engine light, however the dashboard light come on dim, both turn signal is lit solid and high beam light is lit. When I do turn on my lights, all lights on the dash turns off, but the chime still work. Cranks normal, wont start. I plugged in a lower end OB2 scanner to see if it would give me something. Ironically, as soon as I plug it in, the dashboard goes to normal, truck starts up like its brand new, drive fine with the scanner still plugged in; unplug problem resurface. If u put a high end scanner(the 7-9 grand), the prob is still there, but the device reads no connection. After I took it home, I unplug the ICM, I hear all the modules cycle, like a reset. Plug it back in and I have a brand new truck (for 24 hrs it seems like). I did replace the ICM. It works well for 2-3 weeks, now the problem is back. Any ideas before I start throwing away money.
Monday, January 6th, 2020 AT 3:25 PM