I also have this issue on my 21 Silverado 3.0 duramax and I can’t seem to drive it anytime without the code being there… dealership wants 3K to fix the coolant control valve… I’ve had the truck a month and the light has been on since week 1… Needless to say I’m pissed and the dealer I bought it from isn’t helping at all… Used vehicle and out of warranty and it’s my problem now… I’m wondering if anyone has found any honest fixes and will this problem go away if if spend the money … it almost seems like this should be some type of a recall issue since it’s so common with vehicles with lower miles …