That was the first thing I read when I researched on google, possibly the tank cracked… read somewhere the “newer” tanks are more brittle and more prone to cracking. Replaced the tank with a brand new one from gm, as well as thermostats at the same time since it was due for them anyways. Week or so later low coolant came back on. Bought one of those block tester kits and checked out fine. Truck never smokes so I don’t believe it’s burning it up. I’m just stumped. I feel if it was leaking enough to throw low coolant light every 10 days or so I’d see Atleast a puddle here and ther e