Crazy fuel guage readings
2016 LML. About every 10 times, when I start the vehicle, the fuel gauge will show empty.....and "Low Fuel" light comes on. If I sit for up to 10 minutes, or longer, the fuel gauge slowly climbs back to where it is accurate.
I have a Trax3 37 gallon automatic-filling auxiliary fuel tank in the bed. It automatically fills main tank, and has its own gauge. During these times, it flits back and forth between normal, and "SNDR MSO" message, and shows the same 0 percent in Main tank. Then sometimes, the Trax3 guage shows correct main tank readings even while the vehicle DIC shows empty.
It never stays empty.......it will revert slowly back to normal after a while.
2016 GMC Denali 3500 Dually